DTC B1317, B1318 [DSC]

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DTC B1317, B1318 [DSC]

B3E040243000W13

DTC | B1317, B1318 | Power supply system

DETECTION CONDITION

• B1317

  - High ignition voltage (16 V or more) is detected at the voltage monitor of the solenoid valve or motor monitor.

• B1318

  - When driving the vehicle at 20 km/h {12.4 mph} or more, low ignition voltage (10 V or less) is detected at the voltage monitor of the solenoid valve or motor monitor.

POSSIBLE CAUSE

• ABS 1 30A/ABS 2 20A/ABS IG 10A fuse malfunction
• Open or short circuit in the wiring harness between DSC HU/CM terminal AK and battery
• Open or short circuit in the wiring harness between DSC HU/CM terminal AU and battery
• Open or short circuit in the wiring harness between DSC HU/CM terminal AT and battery
• Open circuit in the wiring harness between DSC HU/CM terminal A and body ground
• Open circuit in the wiring harness between DSC HU/CM terminal B and body ground
• Battery deterioration
• Generator malfunction
• Poor connection at connectors (female terminal)

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | INSPECT BATTERY VOLTAGE • Is the battery terminal voltage normal? | Yes | Verify that the battery terminal connection is normal. Go to the next step.
No | Recharge or replace the battery, then go to Step 6. (See BATTERY RECHARGING.) (See BATTERY REMOVAL/INSTALLATION [ZJ, Z6].) (See BATTERY REMOVAL/INSTALLATION [LF].)
2 | INSPECT BATTERY GRAVITY • Is the battery specific gravity as specified? | Yes | Go to the next step.
No | Replace the battery, then go to Step 6. (See BATTERY REMOVAL/INSTALLATION [ZJ, Z6].) (See BATTERY REMOVAL/INSTALLATION [LF].)
3 | INSPECT CHARGING SYSTEM • Are the generator and the drive belt tensions normal? | Yes | Go to the next step.

No

Replace the generator and/or drive belt if necessary.
(See GENERATOR REMOVAL/INSTALLATION [ZJ, Z6].)
(See GENERATOR REMOVAL/INSTALLATION [LF].)
(See DRIVE BELT REPLACEMENT [ZJ, Z6].)
(See DRIVE BELT REPLACEMENT [LF].)
Go to Step 6.

4

INSPECT DSC HU/CM POWER SUPPLY FOR OPEN CIRCUIT
• Disconnect the DSC HU/CM connectors.
• Turn the ignition switch to the ON position.
• Measure the voltage between following connector terminals of the DSC HU/CM (vehicle harness-side) and body ground:

  - DSC HU/CM: AK-Body ground
  - DSC HU/CM: AU-Body ground
  - DSC HU/CM: AT-Body ground

• Is the voltage 10 V or more?

Yes

Go to the next step.

No | Repair or replace the wiring harness, then go to Step 6.

5

INSPECT DSC HU/CM GROUND FOR POOR GROUND OR OPEN CIRCUIT
• Turn the ignition switch off.
• Measure the resistance between following connector terminals of the DSC HU/CM (vehicle harness-side) and body ground:

  - DSC HU/CM: A-Body ground
  - DSC HU/CM: B-Body ground

• Is the resistance within 0-1 ohm?

Yes

Go to the next step.

No | If there is open circuit: • Repair or replace the wiring harness, then go to the next step. If resistance is not within specification: • Repair or replace the wiring harness for poor ground, then go to the next step.

6

VERIFY THAT THE SAME DTC IS NOT PRESENT
• Reconnect all disconnected connectors.
• Clear the DTCs from the memory.
(See Clearing DTCs Procedures.)
• Start the engine and drive the vehicle at 20 km/h {12.4 mph} or more.
• Are the same DTCs present?

Yes

Repeat the inspection from Step 1.
If the malfunction recurs, replace the DSC HU/CM, then go to the next step.
(See DSC HU/CM REMOVAL/INSTALLATION.)

No | Go to the next step.
7 | VERIFY THAT NO OTHER DTCS ARE PRESENT • Are any other DTCs output? | Yes | Go to the applicable DTC inspection. (See DTC Table.)
No | DTC troubleshooting completed.