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 DOWNSHIFT IN M RANGE DIAGNOSTIC PROCEDURE

STEP	INSPECTION	ACTION
1	Inspect the voltage at TCM terminals 1W and 2D. (See TCM INSPECTION .) Are the voltages normal?	Yes	Inspect the instrument cluster. (See MULTIPLEX COMMUNICATION SYSTEM .)
No	If terminal 2D voltage is abnormal, inspect down switch. If down switch is normal, inspect for continuity between down switch and TCM terminal 2D. 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 2D.
(See TCM INSPECTION .)
Are the voltages normal?

Yes

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

If terminal 2D voltage is abnormal, inspect down switch.

If down switch is normal, inspect for continuity between down switch and TCM terminal 2D.

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 .)