Diagnostic procedure

WARNING: This page is about a different car, the 2005 Mazda RX-8. However, it is still accessible from the selected car via links, so may be relevant.

DOES NOT UPSHIFT IN M RANGE DIAGNOSTIC PROCEDURE

STEP	INSPECTION	ACTION
1	Inspect the voltage at TCM terminals 1W and 2I. (See TCM INSPECTION .) Are the voltages normal?	Yes	Inspect the instrument cluster. (See MULTIPLEX COMMUNICATION SYSTEM .)
No	If terminal 2I voltage is abnormal, inspect the up switch. If up switch is normal, inspect for continuity between the up switch and TCM terminal 2I. Inspect the steering shift switch. If the steering shift switch is normal, inspect for continuity between the steering shift switch and TCM terminal 1W.
2	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 completed. If the vehicle is not repaired or additional diagnostic information is not available, replace the TCM. (See TCM REMOVAL/INSTALLATION .)

STEP

INSPECTION

ACTION

Inspect the voltage at TCM terminals 1W and 2I.
(See TCM INSPECTION .)
Are the voltages normal?

Yes

Inspect the instrument cluster.
(See MULTIPLEX COMMUNICATION SYSTEM .)

If terminal 2I voltage is abnormal, inspect the up switch.

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

Inspect the steering shift switch.

If the steering shift switch is normal, inspect for continuity between the steering shift switch and TCM terminal 1W.

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 completed.
- If the vehicle is not repaired or additional diagnostic information is not available, replace the TCM.
  (See TCM REMOVAL/INSTALLATION .)