Diagnostic procedure

WARNING: This page is about a different car, the 2005 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

NO. 12 TORQUE CONVERTER CLUTCH (TCC) NON-OPERATION [AW6A-EL] DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	With the ignition switch at the ON position. Does the gear position indicator light indication correspond to the selector lever position?	Yes	Go to the next step.
1		No	Go to No. 27 "NO. 27 GEAR POSITION INDICATOR LIGHT DOES NOT ILLUMINATE IN M RANGE ", or No. 28 "NO. 28 GEAR POSITION INDICATOR LIGHT ILLUMINATES IN D RANGE OR P, N, R POSITIONS ".
2	Disconnect the TCM. Is the resistance between the TCM ground terminal A9 and the body GND less than 5.0 ohms?	Yes	Go to the next step.
2		No	Repair open ground circuit.
3	Inspect the line pressure control solenoid. (See SOLENOID VALVE INSPECTION .) Is the line pressure control solenoid normal?	Yes	Go to the next step.
3		No	Replace the control valve body. (See CONTROL VALVE BODY REMOVAL/INSTALLATION .)
4	Remove the torque converter. (See TORQUE CONVERTER REMOVAL/INSTALLATION .) Inspect the torque converter. Is the torque converter normal?	Yes	Inspect the ATF condition. If a large amount of metal specks are found, replace the transaxle. (See AUTOMATIC TRANSAXLE REMOVAL/INSTALLATION .) If a large amount of metal specks are not found, replace the control valve body. (See CONTROL VALVE BODY REMOVAL/INSTALLATION .)
4		No	Replace the torque converter.
5	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.