TIRE PRESSURE MONITOR(DIAGNOSTICS)
TPM(diag)

TIRE PRESSURE MONITOR(DIAGNOSTICS) > Basic Diagnostic Procedure
PROCEDURE

Remove foreign matter (dust, water, oil, etc.) from the TPMS & keyless entry CM connector or TPMS CM connector during removal and installation.

1. PERFORM CUSTOMER INTERVIEW.

Ask the customer when and how the trouble occurred using the interview check list. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Check List for Interview

Did you interview the customer?

2

Perform the interview, and 2

2. BASIC INSPECTION.

Perform basic inspection. TIRE PRESSURE MONITOR(DIAGNOSTICS)>General Description>INSPECTION

Is the check result OK?

3

Repair the faulty part found in basic inspection, and 3

3. CHECK SUBARU SELECT MONITOR COMMUNICATION.
1.

Turn the ignition switch to OFF.

2.

Connect the Subaru Select Monitor to data link connector. COMMON(diag)>Data Link Connector

3.

Turn the ignition switch to ON and run the Subaru Select Monitor.

4.

Select [Tire Pressure Monitor].

For detailed operation procedures, refer to “Help” of application.

Is communication possible?

4

Check the communication circuit. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Procedure for Subaru Select Monitor Communication

4. CHECK DTC.

Read the DTC of [Tire Pressure Monitor] using the Subaru Select Monitor. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Are any DTCs displayed? (Current malfunction)

Record the DTC, and 5

- The system has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.

- In this case, there may be temporary poor communication due to radio wave environment inside/outside the vehicle.

5. PERFORM DIAGNOSIS.
1.

Perform the diagnosis according to the displayed DTC. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST

2.

Repair or replace the cause of trouble.

3.

Using the Subaru Select Monitor, perform the clear memory of [Tire Pressure Monitor]. COMMON(diag)>Clear memory

4.

Execute the inspection mode. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Inspection Mode

5.

Read the DTC of [Tire Pressure Monitor] using the Subaru Select Monitor. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Are any DTCs displayed? (Current malfunction)

Repeat step 5 until DTC is not shown.

Finish the diagnosis.

TIRE PRESSURE MONITOR(DIAGNOSTICS) > Check List for Interview
CHECK

Inspect the following items regarding the vehicle’s state.

Tire Pressure Monitor Check List for Interview Date of Vehicle Bring-in    Year    Month    Date
Customer’s name | Registration No. | Initial year of registration Year    Month    Date
Vehicle model | Frame number
Interviewer | Inspector | Engine type | Odometer reading
Customer specified content • • •
Date and time when the trouble occurred |  | Frequency of trouble occurrence | Always occurs Sometimes occurs (   times per day,   times per month)
Condition of trouble occurrence (How the trouble occurs) |  | Weather | Fine Cloudy•Rain•Snow•Others (       )
Temperature | °C (°F) —   °C (°F)
Road conditions |
Road surface condition |
Accessory installation condition |
Diagnostic trouble code |
Time stamp |
Control module item number/Ver. |
Condition of trouble occurrence (How the trouble occurs) |
Vehicle bring-in history information |

TIRE PRESSURE MONITOR(DIAGNOSTICS) > General Description
CAUTION
1. SRS AIRBAG SYSTEM

Airbag system wiring harness is routed near the TPMS control module. AIRBAG(DIAGNOSTICS)>General Description>CAUTION

2. TPMS & KEYLESS ENTRY CM OR TPMS CM

- If the transmitter is replaced, ID registration for the transmitter is required. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Register Transmitter (ID)>OPERATION

- When adjusting tire pressure indoors in winter, there is a big temperature difference between the indoor facilities and outside. Once the car is outside where the temperature is lower, the air pressure in the tires will drop, causing the tire pressure warning light to illuminate, even if the pressure in the tires was adjusted to standard values indoors. To avoid this, it is necessary to adjust the tire pressure to the high side in consideration of the difference in temperature between inside and outside according to the following table.

- 225/60R17

  Temperature °C (°F) | Indoor temperature | 15.5 (60)
  Ambient air temperature | −1 (30) | −12 (10) | −23 (−10)
  Air pressure kPa (psi) | Front | 250 (36) | 265 (38) | 280 (41)
  Rear | 240 (35) | 255 (37) | 270 (39)

- 225/55R18

  Temperature °C (°F) | Indoor temperature | 15.5 (60)
  Ambient air temperature | −1 (30) | −12 (10) | −23 (−10)
  Air pressure kPa (psi) | Front | 260 (38) | 275 (40) | 290 (42)
  Rear | 250 (36) | 265 (38) | 280 (41)

TIRE PRESSURE MONITOR(DIAGNOSTICS) > General Description
INSPECTION
1. BASIC INSPECTION

Before performing diagnosis, check the following item which might affect the quality of the tire pressure monitoring system.

1.

Check the battery. STARTING/CHARGING SYSTEMS(H4DO)>Battery>INSPECTION

2.

Check the fuse condition. SECURITY AND LOCKS>Relay and Fuse

Make sure that ampere of the fuse is setting value, and it is not blown out.

3.

Inspect that the tire pressure is within the specification while the tire is cool. (Refer to Tire Caution Label.)

4.

Check the tires for damage or the insertion of foreign matters.

5.

Check the connecting condition of harness and harness connector.

To check harness for open or short circuits, shake the suspected trouble spot or connector.

TIRE PRESSURE MONITOR(DIAGNOSTICS) > General Description
PREPARATION TOOL
1. SPECIAL TOOL

ILLUSTRATION | TOOL NUMBER | DESCRIPTION | REMARKS
| — | SUBARU SELECT MONITOR 4 | Used for setting of each function and troubleshooting for electrical system. For detailed operation procedures, refer to “Help” of application.

2. GENERAL TOOL

TOOL NAME | REMARKS
Circuit tester | Used for measuring resistance, voltage and current.
Transmitter registration tool | Used to register the transmitter ID. Manufacturer: Latest model of ATEQ Corp. Or, use an ATEQ model with the updated software compatible with Generation6 transmitter. For details of the software update, registration procedures and retailers, contact ATEQ in your country.
DST-i | Used together with Subaru Select Monitor 4.

TIRE PRESSURE MONITOR(DIAGNOSTICS) > General Description
SYSTEM BLOCK DIAGRAM
TIRE PRESSURE MONITOR(DIAGNOSTICS) > Electrical Component Location
LOCATION

(1) | Tire pressure warning light | (2) | Data link connector |  |

(1) | Transmitter (tire inflation pressure sensor) | (2) | TPMS & keyless entry CM∗1 or TPMS CM∗2

∗1: Without keyless access with push button start system

∗2: With keyless access with push button start system

TIRE PRESSURE MONITOR(DIAGNOSTICS) > Control Module I/O Signal
ELECTRICAL SPECIFICATION

Terminal No. | Contents | Measuring condition | Standard
(R221) or (R211) No. 1 | CAN-L | Digital signal; can not be measured | —
(R221) or (R211) No. 2 | CAN-H | Digital signal; can not be measured | —
(R221) or (R211) No. 3 | — | — | —
(R221) or (R211) No. 4 | — | — | —
(R221) or (R211) No. 5 | — | — | —
(R221) or (R211) No. 6 ←→ Chassis ground | Ignition power supply | When ignition switch is ON | 9 — 16 V
(R221) or (R211) No. 7 ←→ Chassis ground | GND | Always | 1 Ω or less
(R221) or (R211) No. 8 | — | — | —
(R221) or (R211) No. 9 | — | — | —
(R221) or (R211) No. 10 | — | — | —
(R221) or (R211) No. 11 | — | — | —
(R221) or (R211) No. 12 ←→ Chassis ground | Battery power supply | Always | 9 — 16 V

TIRE PRESSURE MONITOR(DIAGNOSTICS) > Inspection Mode
PROCEDURE

Reproduce the malfunction occurrence condition as much as possible. Drive the vehicle at 40 km/h (25 MPH) or faster for at least ten minutes.

TIRE PRESSURE MONITOR(DIAGNOSTICS) > Diagnostic Procedure for Subaru Select Monitor Communication
INSPECTION

Detecting condition:

- Defective harness

- Power supply circuit malfunction

- Defective TPMS & keyless entry CM or TPMS CM

- Defective CAN communication circuit

- Defective Subaru Select Monitor

Trouble symptom:

Not communicable with Subaru Select Monitor.

Wiring diagram:

- TPMS system WIRING SYSTEM>Tire Pressure Monitoring System>WIRING DIAGRAM

- CAN communication system WIRING SYSTEM>CAN Communication System>WIRING DIAGRAM

Before performing diagnosis, refer to “CAUTION” in “General Description”. TIRE PRESSURE MONITOR(DIAGNOSTICS)>General Description>CAUTION

1. CHECK POWER SUPPLY CIRCUIT.

Connect DST-i to data link connector.

Does DST-i turn ON?

4

2

2. CHECK POWER SUPPLY CIRCUIT.
1.

Turn the ignition switch to ON.

2.

Using the tester, measure the voltage between data link connector and chassis ground.

Connector & terminal

(i288) No. 8 (+) — Chassis ground (−):

(i288) No. 16 (+) — Chassis ground (−):

Is the voltage 10 V or more?

3

- Repair the power supply circuit.

  In this case, repair the following item:

  - Open or ground short circuit of harness between battery and data link connector

  - Blown out of fuse

3. CHECK HARNESS BETWEEN DATA LINK CONNECTOR AND CHASSIS GROUND (OPEN).
1.

Turn the ignition switch to OFF.

2.

Using the tester, measure the resistance between data link connector and chassis ground.

Connector & terminal

(i288) No. 4 — Chassis ground:

(i288) No. 5 — Chassis ground:

Is the resistance less than 5 Ω?

Check for poor contact of the data link connector, and repair a fault, if any. When no fault is found, go to 4.

Repair the harness and connector.

4. CHECK SUBARU SELECT MONITOR.
1.

Connect the Subaru Select Monitor to a normal vehicle.

2.

Start the engine and establish communication between the Subaru Select Monitor and vehicle.

Is communication possible?

5

Use another Subaru Select Monitor because the CAN communication circuit of the Subaru Select Monitor is faulty.

5. CHECK LAN SYSTEM.

Perform the diagnosis for LAN system. LAN SYSTEM (DIAGNOSTICS)>Basic Diagnostic Procedure>PROCEDURE

Is LAN system OK?

6

Perform the inspection according to the diagnosis for LAN system.

6. CHECK CONNECTOR.

Check for poor contact of TPMS & keyless entry CM or TPMS CM connector, data link connector, or intermediate connector.

Is the connector OK?

7

Repair the connector.

7. CHECK FUSE.
1.

Turn the ignition switch to OFF.

2.

Remove a fuse from the fuse box.

3.

Check the fuse. SECURITY AND LOCKS>Relay and Fuse

Is the fuse OK?

8

Replace the fuse. If the replaced fuse blows out easily, repair the ground short circuit in harness between the TPMS & keyless entry CM or TPMS CM connector and fuse.

8. CHECK TPMS & KEYLESS ENTRY CM OR TPMS CM CONNECTOR POWER SUPPLY CIRCUIT (OPEN).
1.

Disconnect the connector of the TPMS & keyless entry CM or TPMS CM.

2.

Turn the ignition switch to ON.

3.

Measure the voltage between TPMS & keyless entry CM or TPMS CM connector and chassis ground.

Connector & terminal

Without keyless access with push button start system

(R221) No. 6 (+) — Chassis ground (−):

(R221) No. 12 (+) — Chassis ground (−):

With keyless access with push button start system

(R211) No. 6 (+) — Chassis ground (−):

(R211) No. 12 (+) — Chassis ground (−):

Is the voltage 10 V or more?

9

Check for open or short circuit in the harness between TPMS & keyless entry CM or TPMS CM connector and fuse.

9. CHECK TPMS & KEYLESS ENTRY CM OR TPMS CM GROUND CIRCUIT (OPEN).

Measure the resistance of harness between TPMS & keyless entry CM or TPMS CM connector and chassis ground.

Connector & terminal

Without keyless access with push button start system

(R221) No. 7 — Chassis ground:

With keyless access with push button start system

(R211) No. 7 — Chassis ground:

Is the resistance less than 1 Ω?

Check the connection between the data link connector and Subaru Select Monitor.

Repair the harness for ground line.

TIRE PRESSURE MONITOR(DIAGNOSTICS) > Data Monitor
OPERATION

- For detailed operation procedures, refer to “Common (Diagnostics)”. COMMON(diag)>Data Monitor

- For details on the data monitor, refer to the list. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Data Monitor>LIST

TIRE PRESSURE MONITOR(DIAGNOSTICS) > Data Monitor
LIST

Item | Content / display range | Standard | Note
FL Tire status | Status of the front left transmitter | 00000000 — 11111111 | For details, refer to the Notes in the margin.
FR Tire status | Status of the front right transmitter
RR Tire status | Status of the rear right transmitter
RL Tire status | Status of the rear left transmitter
FL Tire air pressure | Value converted to tire pressure from data delivered from transmitter is displayed. (The figure may differ from the actual measured values.) | 0 — 351.645 kPa | —
FR Tire air pressure | 0 — 351.645 kPa | —
RR Tire air pressure | 0 — 351.645 kPa | —
RL Tire air pressure | 0 — 351.645 kPa | —
Vehicle Speed Sensor | Vehicle speed signal which is input in control module | 0 — 255 km/h | —
Pressure warning | Threshold where tire pressure warning light illuminates | 0 — 351.645 kPa | —
Return pressure | Threshold where tire pressure warning light goes out | 0 — 351.645 kPa | —
Transmitter power supply | Transmitter power supply status | ON MODE/OFF | —
INDICATOR LAMP | Status of tire pressure warning light | ON/OFF | —
FL Registered ID | ID of the front left transmitter | 0 —FFFFFFFF | —
FR Registered ID | ID of the front right transmitter | 0 —FFFFFFFF
RR Registered ID | ID of the rear right transmitter | 0 —FFFFFFFF
RL Registered ID | ID of the rear left transmitter | 0 —FFFFFFFF
Latest reception ID | Previous reception ID | 0 —FFFFFFFF
Reception ID one ahead | Second latest reception ID | 0 —FFFFFFFF
Before reception ID2 | Third latest reception ID | 0 —FFFFFFFF
Before reception ID3 | Fourth latest reception ID | 0 —FFFFFFFF

BIt | Data | Condition
7 | Low Battery | Shows the remaining battery level. | 0: Normal 1: Low level
6 | Sensor Fail | Shows the malfunction of TPMS. | 0: Normal 1: Malfunctioning
5 | LF Response | Shows the responding transmission to the LF signal. | 0: Transmission for other than LF response 1: Transmission for LF response
4 | PAL Condition | Shows the status of position information. | 0: Position detection finished 1: Position detection in progress
3 | Rolling Detection | Shows the status of tire rotation detection. | 0: Tire stop status detected 1: Tire rotation status detected
2-0 | Status code | Shows the status in valve transmission. | 0: Responding to the LF signal “Learn LF” 1: Detecting the change in tire pressure 2: — 3: Responding to the LF signal “Entering off LF” 4: Position detection is in progress (transmission timing is synchronized with tire rotation) 5: Position detection is in progress (transmission timing is not synchronized with tire rotation) 6: Normal driving status (position detection mode is ended) 7: Detecting the completion of change in tire pressure

TIRE PRESSURE MONITOR(DIAGNOSTICS) > Register Transmitter (ID)
OPERATION

Perform the registration procedure of the transmitter in the following cases:

- Transmitter is replaced.

- TPMS & keyless entry CM or TPMS CM is replaced.

- If registration of the transmitter ID is not possible after two attempts, replace the TPMS & keyless entry CM or TPMS CM. WHEEL AND TIRE SYSTEM>Tire Pressure Monitoring System

- During the registration, turn the ignition switch to OFF and end the Subaru Select Monitor. Or if the registration is not performed for 5 minutes or more, the registration mode is cancelled.

- When rotating tires, there is no affect on the performance or functions of the tire pressure monitoring control module even if the transmitter (ID) is not registered, however, the tire position displayed on the Subaru Select Monitor will be incorrect.

1.

Adjust all tire pressures to the specifications.

2.

Connect the Subaru Select Monitor and select [Diagnosis] on [Start] display.

3.

On [Vehicle selection] display, input the target vehicle information and select [OK].

4.

On [Main Menu] display, select [Each System].

5.

On [Select System] display, select [Tire Pressure Monitor], and then select [Enter].

6.

On [Select Function] display, select [Work Support].

7.

On [Work Support] display, select [ID registration].

8.

When [ID registration mode When execute Registered ID is deleted Continue?] is displayed, select [OK].

9.

Contact the transmitter registration tool to the side wall area near the air valve on the front left tire, and press the switch. The transmitter ID is sent to the TPMS & keyless entry CM or TPMS CM. (At this time, the tire pressure warning light blinks to confirm that the registration has started.)

(1) | Air valve (transmitter)
(2) | Transmitter registration tool

- The registration order of transmitter ID is not specified.

- The transmitter registration tool is used by touching the side wall area near the transmitter.

- When registration of each tire is completed, [ID registration completed] is displayed on the Select Monitor screen.

- If registration procedure stop in the halfway (turning ignition switch to OFF, wrong registration order, etc), proceed from step 5).

10.

When ID registration is completed, the tire pressure warning light remains lit for approximately 2 seconds, to end the registration. Switch the screen to [Data Monitor] of Subaru Select Monitor. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Data Monitor

11.

Check the transmitter ID that was registered, then perform a driving test. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Inspection Mode

TIRE PRESSURE MONITOR(DIAGNOSTICS) > Tire Pressure Warning Light / Trouble Indicator Light Illumination Pattern
INSPECTION

(1) | Ignition switch | (8) | Tire inflation pressure warning light (pressure condition) | (15) | Light OFF
(2) | OFF | (9) | Light OFF | (16) | Blink
(3) | ON | (10) | Light ON | (17) | 1 second
(4) | Start | (11) | System status | (18) | Blinks 25 times
(5) | Tire inflation pressure condition | (12) | Normal | (19) | 2 seconds
(6) | Meet the specification | (13) | Malfunction |  |
(7) | Less than standard value (For the pressure warning level, refer to “Data monitor”. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Data Monitor) | (14) | Tire inflation pressure warning light (system condition) |  |

1.

When the tire pressure warning light does not illuminate in accordance with this illumination pattern, there must be an electrical malfunction.

2.

If the tire pressure warning light does not go off, check the TPMS & keyless entry CM or TPMS CM/warning light circuit and the combination meter circuit. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Tire Pressure Warning Light / Trouble Indicator Light Illumination Pattern>TIRE PRESSURE WARNING LIGHT DOES NOT COME OFF

If the problem is fixed while driving at approximately 40 km/h (25 MPH) after the tire pressure warning light blinks/lights, the warning light goes out and the tire pressure monitor system operates normally. (If there is a decrease in tire pressure, or a malfunction of the system, the malfunction history is displayed.)

TIRE PRESSURE MONITOR(DIAGNOSTICS) > Tire Pressure Warning Light / Trouble Indicator Light Illumination Pattern
TIRE PRESSURE WARNING LIGHT DOES NOT COME ON

Detecting condition:

Defective combination meter

Trouble symptom:

When the ignition switch is turned to ON, the tire pressure warning light does not turn on (for approx. 2 seconds).

Before performing diagnosis, refer to “CAUTION” in “General Description”. TIRE PRESSURE MONITOR(DIAGNOSTICS)>General Description>CAUTION

1. CHECK DTC.

Read the DTC of [Tire Pressure Monitor] using the Subaru Select Monitor. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Are any DTCs displayed? (Current malfunction)

Perform the diagnosis for the displayed DTCs. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST

2

2. CHECK COMBINATION METER.

Using the Subaru Select Monitor, check the following items in the [Active Test] of [Combination Meter]. COMBINATION METER (DIAGNOSTICS)>Active Test

- TPMS warning

Does the tire pressure warning light illuminate?

Replace the TPMS & keyless entry CM or TPMS CM. WHEEL AND TIRE SYSTEM>Tire Pressure Monitoring System

Replace the combination meter. INSTRUMENTATION/DRIVER INFO>Combination Meter>REMOVAL

TIRE PRESSURE MONITOR(DIAGNOSTICS) > Tire Pressure Warning Light / Trouble Indicator Light Illumination Pattern
TIRE PRESSURE WARNING LIGHT DOES NOT COME OFF

Detecting condition:

- Defective combination meter

- Tires pressure drop

- Transmitter ID not registered

Trouble symptom:

Tire pressure warning light remains illuminating after engine starts.

Before performing diagnosis, refer to “CAUTION” in “General Description”. TIRE PRESSURE MONITOR(DIAGNOSTICS)>General Description>CAUTION

1. CHECK DTC.

Read the DTC of [Tire Pressure Monitor] using the Subaru Select Monitor. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Are any DTCs displayed?

Perform the diagnosis for the displayed DTCs. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST

2

2. CHECK TRANSMITTER (ID).

Using the Subaru Select Monitor, check the following items in the [Data monitor] of [Tire Pressure Monitor]. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Data Monitor

- FL Registered ID

- FR Registered ID

- RR Registered ID

- RL Registered ID

Is the transmitter ID registered?

3

Register the transmitter ID. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Register Transmitter (ID)>OPERATION

3. CHECK TRANSMITTER DATA OUTPUT.
1.

Start the engine.

2.

Using the Subaru Select Monitor, check the following items in the [Data monitor] of [Tire Pressure Monitor]. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Data Monitor

- INDICATOR LAMP

- FR Registered ID

- RR Registered ID

- RL Registered ID

Is [ON] displayed?

Replace the TPMS & keyless entry CM or TPMS CM. WHEEL AND TIRE SYSTEM>Tire Pressure Monitoring System

Replace the combination meter. INSTRUMENTATION/DRIVER INFO>Combination Meter>REMOVAL

TIRE PRESSURE MONITOR(DIAGNOSTICS) > Tire Pressure Warning Light / Trouble Indicator Light Illumination Pattern
TIRE PRESSURE WARNING LIGHT IS 25 TIMES BLINKING AND TURN ON

Detecting condition:

- Defective TPMS & keyless entry CM or TPMS CM

- Defective harness

- Transmitter is faulty.

Trouble symptom:

Every time the engine starts, tire pressure warning light blinks 25 times and then illuminates.

Before performing diagnosis, refer to “CAUTION” in “General Description”. TIRE PRESSURE MONITOR(DIAGNOSTICS)>General Description>CAUTION

1. CHECK DTC.

Read the DTC of [Tire Pressure Monitor] using the Subaru Select Monitor. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Are any DTCs displayed? (Current malfunction)

Perform the diagnosis for the displayed DTCs. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST

2

2. CHECK LAN COMMUNICATION.

Inspect LAN system. LAN SYSTEM (DIAGNOSTICS)>Basic Diagnostic Procedure>PROCEDURE

Is the check result OK?

Replace the TPMS & keyless entry CM or TPMS CM. WHEEL AND TIRE SYSTEM>Tire Pressure Monitoring System

Perform the inspection according to the diagnosis for LAN system.

TIRE PRESSURE MONITOR(DIAGNOSTICS) > Diagnostic Trouble Code (DTC)
OPERATION

- For detailed operation procedures, refer to “Common (Diagnostics)”. COMMON(diag)>Diagnostic Trouble Code (DTC)

- For details on DTCs, refer to the list. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST

TIRE PRESSURE MONITOR(DIAGNOSTICS) > Diagnostic Trouble Code (DTC)
LIST

Code | Description & trouble part | Reference
C2021 | FL TIRE AIR PRESSURE DECREASE NORMAL MODE | TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C2021 FL TIRE AIR PRESSURE DECREASE NORMAL MODE
C2022 | FR TIRE AIR PRESSURE DECREASE NORMAL MODE | TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C2022 FR TIRE AIR PRESSURE DECREASE NORMAL MODE
C2023 | RR TIRE AIR PRESSURE DECREASE NORMAL MODE | TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C2023 RR TIRE AIR PRESSURE DECREASE NORMAL MODE
C2024 | RL TIRE AIR PRESSURE DECREASE NORMAL MODE | TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C2024 RL TIRE AIR PRESSURE DECREASE NORMAL MODE
C2121 | FL TRANSMITTER NO DATA | TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C2121 FL TRANSMITTER NO DATA
C2122 | FR TRANSMITTER NO DATA | TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C2122 FR TRANSMITTER NO DATA
C2123 | RR TRANSMITTER NO DATA | TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C2123 RR TRANSMITTER NO DATA
C2124 | RL TRANSMITTER NO DATA | TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C2124 RL TRANSMITTER NO DATA
C2221 | FL TRANSMITTER PRESSURE DATA ABNORMAL | TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C2221 FL TRANSMITTER PRESSURE DATA ABNORMAL
C2222 | FR TRANSMITTER PRESSURE DATA ABNORMAL | TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C2222 FR TRANSMITTER PRESSURE DATA ABNORMAL
C2223 | RR TRANSMITTER PRESSURE DATA ABNORMAL | TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C2223 RR TRANSMITTER PRESSURE DATA ABNORMAL
C2224 | RL TRANSMITTER PRESSURE DATA ABNORMAL | TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C2224 RL TRANSMITTER PRESSURE DATA ABNORMAL
C2321 | FL TRANSMITTER STATUS ABNORMAL | TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C2321 FL TRANSMITTER STATUS ABNORMAL
C2322 | FR TRANSMITTER STATUS ABNORMAL | TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C2322 FR TRANSMITTER STATUS ABNORMAL
C2323 | RR TRANSMITTER STATUS ABNORMAL | TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C2323 RR TRANSMITTER STATUS ABNORMAL
C2324 | RL TRANSMITTER STATUS ABNORMAL | TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C2324 RL TRANSMITTER STATUS ABNORMAL
C2421 | FL TRANSMITTER BATTERY VOLTAGE DECREASE | TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C2421 FL TRANSMITTER BATTERY VOLTAGE DECREASE
C2422 | FR TRANSMITTER BATTERY VOLTAGE DECREASE | TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C2422 FR TRANSMITTER BATTERY VOLTAGE DECREASE
C2423 | RR TRANSMITTER BATTERY VOLTAGE DECREASE | TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C2423 RR TRANSMITTER BATTERY VOLTAGE DECREASE
C2424 | RL TRANSMITTER BATTERY VOLTAGE DECREASE | TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C2424 RL TRANSMITTER BATTERY VOLTAGE DECREASE
C2521 | SPEED ABNORMAL | TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C2521 SPEED ABNORMAL
C2721 | THRESHOLD READ MALFUNCTION | TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C2721 THRESHOLD READ MALFUNCTION
C2821 | WHEEL POSITION SENSING ABNORMAL | TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C2821 WHEEL POSITION SENSING ABNORMAL

TIRE PRESSURE MONITOR(DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C2021 FL TIRE AIR PRESSURE DECREASE NORMAL MODE

Refer to DTC C2024 for diagnostic procedure. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C2024 RL TIRE AIR PRESSURE DECREASE NORMAL MODE

TIRE PRESSURE MONITOR(DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C2022 FR TIRE AIR PRESSURE DECREASE NORMAL MODE

Refer to DTC C2024 for diagnostic procedure. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C2024 RL TIRE AIR PRESSURE DECREASE NORMAL MODE

TIRE PRESSURE MONITOR(DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C2023 RR TIRE AIR PRESSURE DECREASE NORMAL MODE

Refer to DTC C2024 for diagnostic procedure. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C2024 RL TIRE AIR PRESSURE DECREASE NORMAL MODE

TIRE PRESSURE MONITOR(DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C2024 RL TIRE AIR PRESSURE DECREASE NORMAL MODE

DTC detecting condition:

Inflation pressure of tires dropped below the specified value.

For the specifications, refer to [Data monitor]. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Data Monitor

Trouble symptom:

Tire pressure warning light illuminates.

- When driving vehicle to perform driving test, there should be always 2 persons (driver and checker) to check.

- Before performing diagnosis, refer to “CAUTION” in “General Description”. TIRE PRESSURE MONITOR(DIAGNOSTICS)>General Description>CAUTION

1. CHECK TIRES.

Lift up the vehicle and check for damage in the tires.

Are there cracks or damage?

Replace the tire.

2

2. CHECK TIRES.

Check the tire air pressure.

Is the tire pressure in the specifications?

3

Adjust the air pressure.

3. CHECK TRANSMITTER DATA.
1.

Drive at 40 km/h (25 MPH) or more.

2.

Using the Subaru Select Monitor, check the following items in the [Data monitor] of [Tire Pressure Monitor]. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Data Monitor

- FL Tire air pressure

- FR Tire air pressure

- RR Tire air pressure

- RL Tire air pressure

Is there a transmitter with different display?

Replace the transmitter (tire pressure sensor) with different display. WHEEL AND TIRE SYSTEM>Tire Pressure Monitoring System

4

4. PERFORM DRIVING TEST.
1.

Using the Subaru Select Monitor, perform the clear memory of [Tire Pressure Monitor]. COMMON(diag)>Clear memory

2.

Perform a driving test. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Inspection Mode>PROCEDURE

3.

Read the DTC of [Tire Pressure Monitor] using the Subaru Select Monitor. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is C2021, C2022, C2023 or C2024 displayed? (Current malfunction)

Replace the TPMS & keyless entry CM or TPMS CM. WHEEL AND TIRE SYSTEM>Tire Pressure Monitoring System

Even if the DTC is displayed, the system has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.

TIRE PRESSURE MONITOR(DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C2121 FL TRANSMITTER NO DATA

Refer to DTC C2124 for diagnostic procedure. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C2124 RL TRANSMITTER NO DATA

TIRE PRESSURE MONITOR(DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C2122 FR TRANSMITTER NO DATA

Refer to DTC C2124 for diagnostic procedure. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C2124 RL TRANSMITTER NO DATA

TIRE PRESSURE MONITOR(DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C2123 RR TRANSMITTER NO DATA

Refer to DTC C2124 for diagnostic procedure. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C2124 RL TRANSMITTER NO DATA

TIRE PRESSURE MONITOR(DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C2124 RL TRANSMITTER NO DATA

DTC detecting condition:

Detected when no data is received from each transmitter for 8 minutes or more at a vehicle speed of 40 km/h (25 MPH) or more. (Timer is not cleared when the vehicle speed becomes lower than 40 km/h halfway.)

Trouble symptom:

Tire pressure warning light blinks 25 times and then illuminates.

- When driving vehicle to perform driving test, there should be always 2 persons (driver and checker) to check.

- Before performing diagnosis, refer to “CAUTION” in “General Description”. TIRE PRESSURE MONITOR(DIAGNOSTICS)>General Description>CAUTION

1. REPRODUCTION OF FAILURE.
1.

Perform the drive test.

Drive the vehicle at 40 km/h (25 MPH) or faster for at least 10 minutes.

2.

Read the DTC of [Tire Pressure Monitor] using the Subaru Select Monitor. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is DTC displayed as current malfunction?

2

- When DTC is displayed as “Past faults”, the system has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.

- In this case, there may be temporary poor communication due to radio wave environment inside/outside the vehicle.

2. START FRONT LEFT TRANSMITTER.
1.

Connect the Subaru Select Monitor and then turn the ignition switch to ON.

2.

Using the Subaru Select Monitor, check the following items in the [Data monitor] of [Tire Pressure Monitor]. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Data Monitor

- Reception ID one ahead

3.

Use the transmitter registration tool and transmit the ID from the front left transmitter to check [Latest reception ID].

Is [Latest reception ID] updated?

3

Replace the front left transmitter. WHEEL AND TIRE SYSTEM>Tire Pressure Monitoring System

3. CHECK FRONT LEFT TRANSMITTER ID.

Compare the ID on the latest ID display with [FL Registered ID].

Are the two IDs same?

4

Record [Latest reception ID] as the front left. 4

4. START FRONT RIGHT TRANSMITTER.

Use the transmitter registration tool and transmit the ID from the front right transmitter to check [Latest reception ID].

Is [Latest reception ID] updated?

5

Replace the front right transmitter. WHEEL AND TIRE SYSTEM>Tire Pressure Monitoring System

5. CHECK FRONT RIGHT TRANSMITTER ID.

Compare the ID on the latest ID display with [FR Registered ID].

Are the two IDs same?

6

Record [Latest reception ID] as the front right. 6

6. START REAR RIGHT TRANSMITTER.

Use the transmitter registration tool and transmit the ID from the rear right transmitter to check [Latest reception ID].

Is [Latest reception ID] updated?

7

Replace the rear right transmitter. WHEEL AND TIRE SYSTEM>Tire Pressure Monitoring System

7. CHECK REAR RIGHT TRANSMITTER ID.

Compare the ID on the latest ID display with [RR Registered ID].

Are the two IDs same?

8

Record [Latest reception ID] as the rear right. 8

8. START REAR LEFT TRANSMITTER.

Use the transmitter registration tool and transmit the ID from the rear left transmitter to check [Latest reception ID].

Is [Latest reception ID] updated?

9

Replace the rear left transmitter. WHEEL AND TIRE SYSTEM>Tire Pressure Monitoring System

9. CHECK REAR LEFT TRANSMITTER ID.

Compare the ID on the latest ID display with [RL Registered ID].

Are the two IDs same?

10

Record [Latest reception ID] as the rear left. 10

10. CHECK MALFUNCTION TRANSMITTER.

Is ID recorded by this procedure?

11

2

11. CHECK MALFUNCTION TRANSMITTER.

Check the registered ID of the transmitter indicated by DTC.

Is there checked ID in the record?

Replace the transmitter of the recorded position. WHEEL AND TIRE SYSTEM>Tire Pressure Monitoring System

Replace the transmitter showing the latest ID that is not included in the registered IDs. WHEEL AND TIRE SYSTEM>Tire Pressure Monitoring System

TIRE PRESSURE MONITOR(DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C2221 FL TRANSMITTER PRESSURE DATA ABNORMAL

Refer to DTC C2224 for diagnostic procedure. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C2224 RL TRANSMITTER PRESSURE DATA ABNORMAL

TIRE PRESSURE MONITOR(DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C2222 FR TRANSMITTER PRESSURE DATA ABNORMAL

Refer to DTC C2224 for diagnostic procedure. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C2224 RL TRANSMITTER PRESSURE DATA ABNORMAL

TIRE PRESSURE MONITOR(DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C2223 RR TRANSMITTER PRESSURE DATA ABNORMAL

Refer to DTC C2224 for diagnostic procedure. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C2224 RL TRANSMITTER PRESSURE DATA ABNORMAL

TIRE PRESSURE MONITOR(DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C2224 RL TRANSMITTER PRESSURE DATA ABNORMAL

DTC detecting condition:

Detected when error data is received from each transmitter at a vehicle speed of 40 km/h (25 MPH) or more.

- When comparing the data from each transmitter to the previous data, the change is large.

- The pressure exceeds what the transmitter can measure. (Excessive pressure)

Trouble symptom:

Tire pressure warning light blinks 25 times and then illuminates.

- When driving vehicle to perform driving test, there should be always 2 persons (driver and checker) to check.

- Before performing diagnosis, refer to “CAUTION” in “General Description”. TIRE PRESSURE MONITOR(DIAGNOSTICS)>General Description>CAUTION

1. REPRODUCTION OF FAILURE.
1.

Perform the drive test.

Drive the vehicle at 40 km/h (25 MPH) or faster for at least 10 minutes.

2.

Read the DTC of [Tire Pressure Monitor] using the Subaru Select Monitor. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is DTC displayed as current malfunction?

2

- When DTC is displayed as “Past faults”, the system has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.

- In this case, there may be temporary poor communication due to radio wave environment inside/outside the vehicle.

2. START FRONT LEFT TRANSMITTER.
1.

Connect the Subaru Select Monitor and then turn the ignition switch to ON.

2.

Using the Subaru Select Monitor, check the following items in the [Data monitor] of [Tire Pressure Monitor]. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Data Monitor

- Reception ID one ahead

3.

Use the transmitter registration tool and transmit the ID from the front left transmitter to check [Latest reception ID].

Is [Latest reception ID] updated?

3

Replace the front left transmitter. WHEEL AND TIRE SYSTEM>Tire Pressure Monitoring System

3. CHECK FRONT LEFT TRANSMITTER ID.

Compare the ID on the latest ID display with [FL Registered ID].

Are the two IDs same?

4

Record [Latest reception ID] as the front left. 4

4. START FRONT RIGHT TRANSMITTER.

Use the transmitter registration tool and transmit the ID from the front right transmitter to check [Latest reception ID].

Is [Latest reception ID] updated?

5

Replace the front right transmitter. WHEEL AND TIRE SYSTEM>Tire Pressure Monitoring System

5. CHECK FRONT RIGHT TRANSMITTER ID.

Compare the ID on the latest ID display with [FR Registered ID].

Are the two IDs same?

6

Record [Latest reception ID] as the front right. 6

6. START REAR RIGHT TRANSMITTER.

Use the transmitter registration tool and transmit the ID from the rear right transmitter to check [Latest reception ID].

Is [Latest reception ID] updated?

7

Replace the rear right transmitter. WHEEL AND TIRE SYSTEM>Tire Pressure Monitoring System

7. CHECK REAR RIGHT TRANSMITTER ID.

Compare the ID on the latest ID display with [RR Registered ID].

Are the two IDs same?

8

Record [Latest reception ID] as the rear right. 8

8. START REAR LEFT TRANSMITTER.

Use the transmitter registration tool and transmit the ID from the rear left transmitter to check [Latest reception ID].

Is [Latest reception ID] updated?

9

Replace the rear left transmitter. WHEEL AND TIRE SYSTEM>Tire Pressure Monitoring System

9. CHECK REAR LEFT TRANSMITTER ID.

Compare the ID on the latest ID display with [RL Registered ID].

Are the two IDs same?

10

Record [Latest reception ID] as the rear left. 10

10. CHECK MALFUNCTION TRANSMITTER.

Is ID recorded by this procedure?

11

2

11. CHECK MALFUNCTION TRANSMITTER.

Check the registered ID of the transmitter indicated by DTC.

Is there checked ID in the record?

Replace the transmitter of the recorded position. WHEEL AND TIRE SYSTEM>Tire Pressure Monitoring System

Replace the transmitter showing the latest ID that is not included in the registered IDs. WHEEL AND TIRE SYSTEM>Tire Pressure Monitoring System

TIRE PRESSURE MONITOR(DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C2321 FL TRANSMITTER STATUS ABNORMAL

Refer to DTC C2324 for diagnostic procedure. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C2324 RL TRANSMITTER STATUS ABNORMAL

TIRE PRESSURE MONITOR(DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C2322 FR TRANSMITTER STATUS ABNORMAL

Refer to DTC C2324 for diagnostic procedure. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C2324 RL TRANSMITTER STATUS ABNORMAL

TIRE PRESSURE MONITOR(DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C2323 RR TRANSMITTER STATUS ABNORMAL

Refer to DTC C2324 for diagnostic procedure. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C2324 RL TRANSMITTER STATUS ABNORMAL

TIRE PRESSURE MONITOR(DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C2324 RL TRANSMITTER STATUS ABNORMAL

Detected when error data is received from each transmitter at a vehicle speed of 40 km/h (25 MPH) or more.

DTC detecting condition:

Unexpected function codes received from each transmitter.

Trouble symptom:

Tire pressure warning light blinks 25 times and then illuminates.

- When driving vehicle to perform driving test, there should be always 2 persons (driver and checker) to check.

- Before performing diagnosis, refer to “CAUTION” in “General Description”. TIRE PRESSURE MONITOR(DIAGNOSTICS)>General Description>CAUTION

1. REPRODUCTION OF FAILURE.
1.

Perform the drive test.

Drive the vehicle at 40 km/h (25 MPH) or faster for at least 10 minutes.

2.

Read the DTC of [Tire Pressure Monitor] using the Subaru Select Monitor. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is DTC displayed as current malfunction?

2

- When DTC is displayed as “Past faults”, the system has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.

- In this case, there may be temporary poor communication due to radio wave environment inside/outside the vehicle.

2. START FRONT LEFT TRANSMITTER.
1.

Connect the Subaru Select Monitor and then turn the ignition switch to ON.

2.

Using the Subaru Select Monitor, check the following items in the [Data monitor] of [Tire Pressure Monitor]. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Data Monitor

- Reception ID one ahead

3.

Use the transmitter registration tool and transmit the ID from the front left transmitter to check [Latest reception ID].

Is [Latest reception ID] updated?

3

Replace the front left transmitter. WHEEL AND TIRE SYSTEM>Tire Pressure Monitoring System

3. CHECK FRONT LEFT TRANSMITTER ID.

Compare the ID on the latest ID display with [FL Registered ID].

Are the two IDs same?

4

Record [Latest reception ID] as the front left. 4

4. START FRONT RIGHT TRANSMITTER.

Use the transmitter registration tool and transmit the ID from the front right transmitter to check [Latest reception ID].

Is [Latest reception ID] updated?

5

Replace the front right transmitter. WHEEL AND TIRE SYSTEM>Tire Pressure Monitoring System

5. CHECK FRONT RIGHT TRANSMITTER ID.

Compare the ID on the latest ID display with [FR Registered ID].

Are the two IDs same?

6

Record [Latest reception ID] as the front right. 6

6. START REAR RIGHT TRANSMITTER.

Use the transmitter registration tool and transmit the ID from the rear right transmitter to check [Latest reception ID].

Is [Latest reception ID] updated?

7

Replace the rear right transmitter. WHEEL AND TIRE SYSTEM>Tire Pressure Monitoring System

7. CHECK REAR RIGHT TRANSMITTER ID.

Compare the ID on the latest ID display with [RR Registered ID].

Are the two IDs same?

8

Record [Latest reception ID] as the rear right. 8

8. START REAR LEFT TRANSMITTER.

Use the transmitter registration tool and transmit the ID from the rear left transmitter to check [Latest reception ID].

Is [Latest reception ID] updated?

9

Replace the rear left transmitter. WHEEL AND TIRE SYSTEM>Tire Pressure Monitoring System

9. CHECK REAR LEFT TRANSMITTER ID.

Compare the ID on the latest ID display with [RL Registered ID].

Are the two IDs same?

10

Record [Latest reception ID] as the rear left. 10

10. CHECK MALFUNCTION TRANSMITTER.

Is ID recorded by this procedure?

11

Replace the transmitter indicated by DTC. WHEEL AND TIRE SYSTEM>Tire Pressure Monitoring System

11. CHECK MALFUNCTION TRANSMITTER.

Check the registered ID of the transmitter indicated by DTC.

Is there checked ID in the record?

Replace the transmitter of the recorded position. WHEEL AND TIRE SYSTEM>Tire Pressure Monitoring System

Replace the transmitter indicated by DTC. WHEEL AND TIRE SYSTEM>Tire Pressure Monitoring System

TIRE PRESSURE MONITOR(DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C2421 FL TRANSMITTER BATTERY VOLTAGE DECREASE

Refer to DTC C2424 for diagnostic procedure. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C2424 RL TRANSMITTER BATTERY VOLTAGE DECREASE

TIRE PRESSURE MONITOR(DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C2422 FR TRANSMITTER BATTERY VOLTAGE DECREASE

Refer to DTC C2424 for diagnostic procedure. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C2424 RL TRANSMITTER BATTERY VOLTAGE DECREASE

TIRE PRESSURE MONITOR(DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C2423 RR TRANSMITTER BATTERY VOLTAGE DECREASE

Refer to DTC C2424 for diagnostic procedure. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C2424 RL TRANSMITTER BATTERY VOLTAGE DECREASE

TIRE PRESSURE MONITOR(DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C2424 RL TRANSMITTER BATTERY VOLTAGE DECREASE

DTC DETECTING CONDITION:

Detected when power supply voltage failure signal is received from each transmitter.

Trouble symptom:

Tire pressure warning light blinks 25 times and then illuminates.

- When driving vehicle to perform driving test, there should be always 2 persons (driver and checker) to check.

- Before performing diagnosis, refer to “CAUTION” in “General Description”. TIRE PRESSURE MONITOR(DIAGNOSTICS)>General Description>CAUTION

1. REPRODUCTION OF FAILURE.
1.

Perform the drive test.

Drive the vehicle at 40 km/h (25 MPH) or faster for at least 10 minutes.

2.

Read the DTC of [Tire Pressure Monitor] using the Subaru Select Monitor. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is DTC displayed as current malfunction?

2

- When DTC is displayed as “Past faults”, the system has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.

- In this case, there may be temporary poor communication due to radio wave environment inside/outside the vehicle.

2. CHECK TRANSMITTER.
1.

Replace all transmitters and register their IDs. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Register Transmitter (ID)>OPERATION

2.

Using the Subaru Select Monitor, perform the clear memory of [Tire Pressure Monitor]. COMMON(diag)>Clear memory

3.

Perform the Inspection Mode. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Inspection Mode

Is the fault eliminated?

Internal battery of the transmitter had worn out.

Replace the TPMS & keyless entry CM or TPMS CM. WHEEL AND TIRE SYSTEM>Tire Pressure Monitoring System

TIRE PRESSURE MONITOR(DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C2521 SPEED ABNORMAL

DTC detecting condition:

Detected when transmitter normal signal is received at a vehicle speed of less than 6 km/h (4 MPH).

Trouble symptom:

Tire pressure warning light blinks 25 times and then illuminates.

Wiring diagram:

Tire pressure monitoring system WIRING SYSTEM>Tire Pressure Monitoring System>WIRING DIAGRAM

Before performing diagnosis, refer to “CAUTION” in “General Description”. TIRE PRESSURE MONITOR(DIAGNOSTICS)>General Description>CAUTION

1. CHECK LAN COMMUNICATION.

Inspect LAN system. LAN SYSTEM (DIAGNOSTICS)>Basic Diagnostic Procedure

Is the check result OK?

2

Perform the inspection according to the diagnosis for LAN system.

2. CHECK VDC.

Check the VDC. BRAKE CONTROL (DIAGNOSTICS)>Basic Diagnostic Procedure

Is the check result OK?

3

Perform the inspection according to the VDC diagnosis.

3. CHECK CONNECTOR.

Check each connector.

Is there poor contact or any other faults?

Repair the connector.

Replace the TPMS & keyless entry CM or TPMS CM. WHEEL AND TIRE SYSTEM>Tire Pressure Monitoring System

TIRE PRESSURE MONITOR(DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C2721 THRESHOLD READ MALFUNCTION

DTC detecting condition:

When threshold read abnormal (TPMS & keyless entry CM or TPMS CM abnormal) is detected.

Trouble symptom:

Tire pressure warning light blinks 25 times and then illuminates.

Before performing diagnosis, refer to “CAUTION” in “General Description”. TIRE PRESSURE MONITOR(DIAGNOSTICS)>General Description>CAUTION

1. REPRODUCTION OF FAILURE.
1.

Turn the ignition switch to ON.

2.

Read the DTC of [Tire Pressure Monitor] using the Subaru Select Monitor. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is DTC displayed as current malfunction?

2

- When DTC is displayed as “Past faults”, the system has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.

- In this case, there may be temporary poor communication due to radio wave environment inside/outside the vehicle.

2. REPRODUCTION OF FAILURE.
1.

Turn the ignition switch to OFF.

2.

Disconnect the ground terminal from the battery sensor, and reconnect it.REPAIR CONTENTS>NOTE > BATTERY

3.

Turn the ignition switch to ON.

4.

Read the DTC of [Tire Pressure Monitor] using the Subaru Select Monitor. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is DTC displayed as current malfunction?

Replace the TPMS & keyless entry CM or TPMS CM. WHEEL AND TIRE SYSTEM>Tire Pressure Monitoring System

- When DTC is displayed as “Past faults”, the system has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.

- In this case, there may be temporary poor communication due to radio wave environment inside/outside the vehicle.

TIRE PRESSURE MONITOR(DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C2821 WHEEL POSITION SENSING ABNORMAL

DTC detecting condition:

When the position detection does not finish and fails 10 times in a row.

Trouble symptom:

Pressure monitor display of the combination meter indicates “—”.

Before performing diagnosis, refer to “CAUTION” in “General Description”. TIRE PRESSURE MONITOR(DIAGNOSTICS)>General Description>CAUTION

1. CHECK DRIVING HISTORY.

Ask the customer about the following items.

- Did the customer drive in a traffic congestion?

- Did the customer drive on rough road (such as unpaved road)?

Did the customer drive in a traffic congestion or on rough road?

When the vehicle is driven in a traffic congestion or on rough road, this DTC may be recorded.

2

2. REPRODUCTION OF FAILURE.
1.

Perform the drive test.

Drive the vehicle at 40 km/h (25 MPH) or faster for at least 10 minutes.

2.

Read the DTC of [Tire Pressure Monitor] using the Subaru Select Monitor. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is DTC displayed as current malfunction?

3

- When DTC is displayed as “Past faults”, the system has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.

- In this case, there may be temporary poor communication due to radio wave environment inside/outside the vehicle.

3. CHECK DTC.

Read the DTC of [Tire Pressure Monitor] using the Subaru Select Monitor. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is any DTC other than DTC C2821 displayed as current malfunction?

Perform the diagnosis for DTCs other than the displayed DTC C2821. TIRE PRESSURE MONITOR(DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST

4

4. CHECK VDC.

Read the DTC of [Brake Control] using the Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is DTC displayed as current malfunction?

Perform the diagnosis for the displayed DTCs. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST

5

5. CHECK TCM.

Read the DTC of [Transmission] using the Subaru Select Monitor. TRANSMISSION (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Are any DTCs displayed? (Current malfunction)

Perform the diagnosis for the displayed DTCs. TRANSMISSION (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST

6

6. CHECK CONNECTOR.

Check each connector.

Is there poor contact or any other faults?

Repair the connector.

Replace the TPMS & keyless entry CM or TPMS CM. WHEEL AND TIRE SYSTEM>Tire Pressure Monitoring System