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2008 - MX-5 - Transmission/Transaxle

NO.29 DOES NOT UPSHIFT IN M RANGE [SJ6A-EL]



29

Does not upshift in M range

DESCRIPTION

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

POSSIBLE CAUSE

  • Up 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 2J.

(See TCM INSPECTION [SJ6A-EL].)

Is the voltage normal?

Yes

Inspect the instrument cluster.

No

Inspect the up switch.

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

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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