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2008 - MX-5 - Transmission/Transaxle

NO.28 GEAR POSITION INDICATOR LIGHT ILLUMINATE IN P, R AND N POSITION [SJ6A-EL]



28

Gear position indicator light illuminate in P, R and N position

DESCRIPTION

  • Gear position indicator light in instrument cluster illuminates in P, R and N position with the ignition switch at ON.

POSSIBLE CAUSE

  • M range switch, TR switch, instrument cluster, or related wiring harness malfunction

    NOTE:

    • Before following the troubleshooting steps, make sure that the Automatic Transaxle ON-Board Diagnostic and Automatic Transaxle Basic Inspection are conducted. (See BASIC INSPECTION[SJ6A-EL].)


Diagnostic procedure

STEP

INSPECTION

ACTION

1

With the ignition switch at ON,

When selector lever is moved, does selector illumination indicate synchronized position to lever location?

Yes

Go to the next step.

No

Inspect the TR switch.

(See TRANSMISSION RANGE (TR) SWITCH INSPECTION[SJ6A-EL].)

2

Inspect the voltage at TCM terminal 2G (M range switch).

(See TCM INSPECTION[SJ6A-EL].)

Is voltage normal?

Yes

Go to the next step.

No

Repair or replace any defective part.

3

Inspect the instrument cluster.

(See INSTRUMENT CLUSTER INSPECTION.)

Is instrument cluster normal?

Yes

Go to the next step.

No

Repair or replace any defective part.

4

Disconnect the TCM and instrument cluster connector.

  • Turn the ignition switch off.

  • Check continuity between the following circuits:

    • TCM terminal 1C and body GND

    • TCM terminal 1G and body GND

    • Instrument cluster terminal 1I and body GND

    • Instrument cluster terminal 1J and body GND

  • Is there continuity?

Yes

Repair or replace harness for short to GND, then go to the next step.

No

Go to the next step.

5

Disconnect the TCM and instrument cluster connector.

  • Turn the ignition switch off.

  • Check continuity between the following circuits:

    • TCM terminal 1C and instrument cluster terminal 1I

    • TCM terminal 1G and instrument cluster terminal 1J

  • Is there continuity?

Yes

Go to the next step.

No

Repair or replace harness for open circuit, then go to the next step.

6

  • Verify the test results.

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

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

      • If the vehicle is repaired, troubleshooting is completed.

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




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