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.

TRANSMISSION OVERHEATS DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	Inspect the oil cooler pipes for bends, damage, corrosion or kinks. Are the oil cooler pipes normal?	Yes	Go to the next step.
1		No	Replace any malfunctioning parts.
2	Perform the stall test. (See STALL SPEED TEST .) Is the stall speed normal?	Yes	Go to the next step.
2		No	Repair or replace any malfunctioning parts.
3	Inspect the following PCM PIDs using the WDS or equivalent. (See PCM INSPECTION .) APP1 APP2 TP_REL Are the PID values normal?	Yes	Go to the next step.
3		No	Repair or replace any malfunctioning parts.
4	Disconnect the TCM connector. Is the resistance between ground terminal 2M or 2Q at the TCM connector and body ground 5.0 ohms or less ?	Yes	Go to the next step.
4		No	Repair the wiring harness. Reconnect the TCM.
5	Inspect the pressure control solenoid circuit. (See SOLENOID VALVE INSPECTION .) Is it normal?	Yes	Go to the next step.
5		No	Repair or replace any malfunctioning parts.
6	Remove the torque converter. Inspect the torque converter. (See AUTOMATIC TRANSMISSION REMOVAL/INSTALLATION .) (See AT Workshop Manual.) Is the torque converter normal?	Yes	Overhaul the control valve body and repair or replace any malfunctioning parts. (See AUTOMATIC TRANSAXLE RC4A-EL - OVERHAUL .) If the problem remains, overhaul the transmission and repair or replace any malfunctioning parts. (See AUTOMATIC TRANSAXLE RC4A-EL - OVERHAUL .)
6		No	Replace the torque converter. (See AUTOMATIC TRANSMISSION REMOVAL/INSTALLATION .)
7	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 .)