DTC P0712 [FN4A-EL]

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DTC P0712 [FN4A-EL]

B3E050219090W11

DTC P0712 | Transaxle fluid temperature (TFT) sensor circuit malfunction (short to ground)
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DETECTION CONDITION

• If the PCM detects either of the following conditions for 150 s or more, the PCM determines that the TFT sensor circuit has a malfunction.

  - TFT sensor voltage 0.06 V or less and vehicle speed 20 km/h {12 mph} or more

Diagnostic support note:
• This is a continuous monitor (CCM).
• The MIL illuminates if the PCM detects the above malfunction conditions during the first drive cycle.
• A PENDING CODE is not available.
• FREEZE FRAME DATA is available.
• The AT warning light illuminates.
• The DTC is stored in the PCM memory.

POSSIBLE CAUSE

• TFT sensor malfunction
• Short to ground in wiring harness between TFT sensor terminal A and ATX terminal E
• Short to ground in wiring harness between TFT sensor terminal B and ATX terminal H
• Short to ground in wiring harness between ATX terminal E and PCM terminal 1AU (Z6)/1U (LF)
• Damaged connectors between TFT sensor and PCM
• PCM malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | VERIFY FREEZE FRAME DATA HAS BEEN RECORDED • Has the FREEZE FRAME DATA been recorded? | Yes | Go to the next step.
No | Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2 | VERIFY RELATED REPAIR INFORMATION AVAILABILITY • Verify related Service Bulletins and/or on-line repair information availability. • Is any related repair information available? | Yes | Perform repair or diagnosis according to the available repair information. • If the vehicle is not repaired, go to the next step.
No | Go to the next step.
3 | VERIFY CURRENT INPUT SIGNAL STATUS • Turn the ignition switch to the ON position (engine off). • Inspect the voltage at PCM terminal 1AU (Z6)/1U (LF). • Is the voltage above 0.06 V? | Yes | Go to the intermittent concern troubleshooting procedure. (See INTERMITTENT CONCERN TROUBLESHOOTING [ZJ, Z6].) (See INTERMITTENT CONCERN TROUBLESHOOTING [LF].)
No | Go to the next step.
4 | INSPECT TERMINAL CONDITION • Turn the ignition switch to the LOCK position. • Disconnect the ATX connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Are the terminals bent? | Yes | Repair or replace the terminals, then go to Step 9. • If the terminals cannot be repaired, replace the wiring harness, then go to Step 9.
No | Go to the next step.
5 | INSPECT TFT SENSOR CIRCUIT • Turn the ignition switch to the ON position (engine off). • Verify that the voltage changes to 4.67 V or more at PCM terminal 1AU (Z6)/1U (LF) when ATX connector is disconnected. • Does the voltage change? | Yes | Go to the next step.
No | Go to Step 8.

6

INSPECT TFT SENSOR TERMINAL CONDITION

• Turn the ignition switch to the LOCK position.
• Remove the under cover of control valve body.
• Disconnect the TFT sensor connector.
• Inspect for bent TFT sensor terminals.
• Are the terminals bent?

Yes

Repair terminals or replace the TFT sensor, then go to Step 9.
(See TRANSAXLE FLUID TEMPERATURE (TFT) SENSOR REMOVAL/INSTALLATION.)

No | Go to the next step.

7

INSPECT TFT SENSOR CIRCUIT FOR SHORT TO GROUND

• Inspect for continuity between TFT sensor terminals (wiring harness-side) and body ground.

  - A and body ground
  - B and body ground

• Is there continuity?

Yes

Repair or replace the wiring harness, then go to Step 9.

No | Replace the TFT sensor, then go to Step 9. (See TRANSAXLE FLUID TEMPERATURE (TFT) SENSOR REMOVAL/INSTALLATION.)
8 | INSPECT ATX CONNECTOR CIRCUIT FOR SHORT TO GROUND • Turn the ignition switch to the LOCK position. • Inspect for continuity between ATX terminal E (wiring harness-side) and body ground. • Is there continuity? | Yes | Repair or replace the wiring harness, then go to the next step.
No | Go to the next step.

9

VERIFY TROUBLESHOOTING OF DTC P0712 COMPLETED

• Make sure to reconnect all the disconnected connectors.
• Clear the DTC from the memory using the WDS or equivalent.
• Drive the vehicle under the following condition for 150 s or more.

  - Vehicle speed (VSS PID) 20 km/h {12 mph} or more.

• Is the same DTC present?

Yes

Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION [ZJ, Z6].)
(See PCM REMOVAL/INSTALLATION [LF].)

No | Go to the next step.
10 | VERIFY AFTER REPAIR PROCEDURE • Perform the "After Repair Procedure". (See AFTER REPAIR PROCEDURE [FN4A-EL].) • Are any DTCs present? | Yes | Go to the applicable DTC inspection.
No | DTC troubleshooting completed.