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2008 - MX-5 - Brakes

DTC C1186, C1266 [DYNAMIC STABILITY CONTROL (DSC)]



DTC

C1186, C1266

Valve relay system

DETECTION CONDITION

  • C1186

    • DSC HU/CM internal valve relay remains OFF when valve relay ON is commanded.

  • C1266

    • DSC HU/CM internal valve relay remains ON (stuck) when valve relay OFF is commanded.

POSSIBLE CAUSE

  • ABS 30 A fuse malfunction

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

  • Open or short circuit in the DSC HU/CM internal valve relay, or stuck valve relay

  • Poor connection at connectors (female terminal)


Diagnostic procedure

STEP

INSPECTION

ACTION

1

INSPECT DSC FUSE CONDITION
  • Is the ABS 30 A fuse normal?

Yes

Go to the next step.

No

Replace the fuse, then go to Step 3.

2

INSPECT VALVE RELAY POWER SUPPLY FOR OPEN CIRCUIT
  • Turn the ignition switch off.

  • Disconnect DSC HU/CM connector.

  • Turn the ignition switch to the ON position (engine off).

  • Measure voltage between DSC HU/CM terminal C (harness-side) and ground.

  • Is voltage B+?

Yes

Go to the next step.

No

Repair or replace the wiring harness for open circuit between battery positive terminal and DSC HU/CM terminal C, then go to the next step.

3

VERIFY TROUBLESHOOTING COMPLETED

Yes

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

(See DSC HU/CM REMOVAL/INSTALLATION.)

No

Go to the next step.

4

VERIFY AFTER REPAIR PROCEDURE
  • Are any other DTCs present?

Yes

Go to the applicable DTC inspection.

(See ON-BOARD DIAGNOSIS[DYNAMIC STABILITY CONTROL (DSC)].)

No

DTC troubleshooting completed.




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