Diagnostic procedure

WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

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.
1		No	Check value at the following. TCM terminal voltage: 1U (TR switch) Repair or replace any malfunctioning parts.
2	Inspect the voltage at TCM terminal 1K (M range switch) (See TCM INSPECTION [AW6A-EL] .) Is voltage normal?	Yes	Go to the next step.
2		No	Repair or replace any malfunctioning part.
3	Inspect the instrument cluster (See INSTRUMENT CLUSTER INSPECTION .) Is instrument cluster normal?	Yes	Go to the next step.
3		No	Repair or replace any malfunctioning part.
4	Disconnect the TCM and instrument cluster connector. Switch the ignition to off. Check continuity between the following circuits TCM terminal A6 and body ground TCM terminal A14 and body ground Instrument cluster terminal 1W and body ground Instrument cluster terminal 1X and body ground Is there continuity?	Yes	Repair or replace harness for short to ground, then go to the next step.
4		No	Go to the next step.
5	Disconnect the TCM and instrument cluster connector Switch the ignition to off Check continuity between the following circuits TCM terminal A6 and instrument cluster terminal 1W TCM terminal A14 and instrument cluster terminal 1X Is there continuity?	Yes	Go to the next step.
5		No	Repair or replace harness for open circuit, then go to the next step.
6	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.