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2008 - MX-5 - Brakes

NO.5 ABS WARNING LIGHT STAYS ON 4 S OR MORE WHEN IGNITION SWITCH TURNED TO ON POSITION



5

ABS warning light stays on 4 s or more when the ignition switch to the ON position.

[TROUBLESHOOTING HINTS]

  • ABS HU/CM detects ABS system malfunction.


Diagnostic procedure

STEP

INSPECTION

ACTION

1

INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC‐2 FOR CONTINUITY AND SHORTS
  • Perform the DTC inspection.

  • Is an error message displayed regarding communication between the ABS HU/CM and the M-MDS?

Yes

If a communication error message is displayed even after inspecting according to procedures displayed in the M-MDS, go to Step 4.

No

Go to the next step.

2

INSPECT FOR DTCs IN ABS HU/CM
  • Have DTCs been stored in memory?

Yes

Perform the applicable DTC inspection.

(See ON-BOARD DIAGNOSIS[ABS].)

No

Go to the next step.

3

INSPECT WARNING LIGHT OPERATION
  • Does the warning light illuminate?

Yes

Replace the ABS HU/CM (open circuit or short to ground in ABS HU/CM).

(See ABS HU/CM REMOVAL/INSTALLATION.)

No

Replace the instrument cluster.

(See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)

*4

INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC‐2 FOR CONTINUITY

Disconnect the ABS HU/CM connector.

  • Is there continuity between connector terminal Z, Y and DLC-2?

Yes

Go to the next step.

No

Repair the wiring harness between the ABS HU/CM and DLC-2.

*5

INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC‐2 FOR SHORT TO B+
  • Is the voltage approx. 12V at connector terminal Z, Y?

Yes

Repair the wiring harness between the ABS HU/CM and DLC-2.

No

Go to the next step.

*6

INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC‐2 FOR SHORT TO GROUND
  • Is there continuity between connector terminal Z, Y and ground?

Yes

Repair the wiring harness between the ABS HU/CM and DLC-2.

No

Replace the ABS HU/CM (communication circuit malfunction in ABS HU/CM).

(See ABS HU/CM REMOVAL/INSTALLATION.)




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