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2008 - MX-5 - Brakes

DTC B1317, B1318 [ABS]



DTC

B1317, B1318

Power supply system

DETECTION CONDITION

  • B1317

    • The voltage at ABS HU/CM terminal J is 16.8 V or more.

  • B1318

    • The vehicle speed exceeds 6 km/h and the voltage at ABS HU/CM terminal J is less than 9.6 V

POSSIBLE CAUSE

  • ENGINE 15 A fuse malfunction

  • Open circuit or short to ground in the wiring harness between the ABS HU/CM terminal J and the battery

  • Open circuit or faulty ground in the wiring harness between the ABS HU/CM terminal D and the 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

Make sure that battery terminal connection is normal.

Go to the next step.

No

Charge or replace the battery, then go to Step 6.

(See BATTERY RECHARGING [LF].)

(See BATTERY REMOVAL/INSTALLATION [LF].)

2

INSPECT BATTERY GRAVITY
  • Is battery specific gravity as specified?

Yes

Go to the next step.

No

Replace the battery, then go to Step 6.

(See BATTERY REMOVAL/INSTALLATION [LF].)

3

INSPECT CHARGING SYSTEM
  • Are the generator and drive belt tensions normal?

Yes

Go to the next step.

No

Replace generator and/or drive belt as necessary, then go to Step 6.

(See DRIVE BELT REPLACEMENT [LF].)

(See GENERATOR REMOVAL/INSTALLATION [LF].)

4

INSPECT ABS HU/CM POWER SUPPLY FOR OPEN CIRCUIT
  • Start the engine.

  • Measure the voltage between ABS HU/CM terminal J and ground.

  • Is the voltage approx. 10 V?

Yes

Go to the next step.

No

Repair or replace the wiring harness for open circuit between the ABS HU/CM and ground, then go to Step 6.

5

INSPECT ABS HU/CM GROUND FOR POOR GROUND OR OPEN CIRCUIT
  • Turn the ignition switch off.

  • Measure the resistance between ground and ABS HU/CM terminal D.

  • Is the resistance within 0—1 ohm?

Yes

Go to the next step.

No

If there is no continuity:

  • Repair or replace the wiring harness for open circuit between the ABS HU/CM and ground, then go to the next step.

If the resistance is not within 0—1 ohm:

  • Repair or replace harness for poor ground, then go to the next step.

6

VERIFY TROUBLESHOOTING COMPLETED
  • Make sure to reconnect all disconnected connectors.

  • Clear the DTC from the memory.

    (See ON-BOARD DIAGNOSIS[ABS].)

  • Start the engine and drive the vehicle at 10 km/h {6.2 mph} or more.

  • Is the same DTC present?

Yes

Replace the ABS HU/CM, then go to the next step.

(See ABS HU/CM REMOVAL/INSTALLATION.)

No

Go to the next step.

7

VERIFY AFTER REPAIR PROCEDURE
  • Are any other DTCs present?

Yes

Go to the applicable DTC inspection.

(See ON-BOARD DIAGNOSIS[ABS].)

No

DTC troubleshooting completed.




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