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2008 - MX-5 - Transmission/Transaxle

NO.30 DOES NOT DOWNSHIFT IN M RANGE [SJ6A-EL]



30

Does not downshift in M range

DESCRIPTION

  • Gear position indicator light in instrument cluster illuminates, but the vehicle does not downshift when the selector lever is pushed to “–” side or steering shift switch “DOWN” is pushed.

POSSIBLE CAUSE

  • Down switch or related wiring harness malfunction

  • Steering shift switch or related circuit malfunction.


Diagnostic procedure

STEP

INSPECTION

ACTION

1

Inspect the voltage at the TCM terminal 2F.

(See TCM INSPECTION [SJ6A-EL].)

Is the voltage normal?

Yes

Inspect the instrument cluster.

No

Inspect the down switch.

  • If the down switch is normal, inspect for continuity between the down switch and TCM terminal 2F.

Inspect steering shift switch.

  • If the steering shift switch is normal, inspect for continuity between the steering shift switch and TCM terminal 2AF.

2

  • Verify test results.

    • If normal, return to the diagnostic index to service any additional symptoms.

    • If malfunction remains, inspect the related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis.

      • If the vehicle is repaired, troubleshooting completed.

      • If the vehicle is not repaired or additional diagnostic information is not available, replace the TCM.




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