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.

DTC P0712 DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA HAS BEEN RECORDED Has FREEZE FRAME DATA been recorded?	Yes	Go to the next step.
1		No	Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2	VERIFY RELATED REPAIR INFORMATION AVAILABILITY Verify related Service Bulletins and/or on-line repair information availability. Is any related repair information available?	Yes	Perform repair or diagnosis according to the available repair information. If the vehicle is not repaired, go to the next step.
2		No	Go to the next step.
3	VERIFY CURRENT INPUT SIGNAL STATUS: IS CONCERN INTERMITTENT OR CONSTANT? Turn the ignition switch to the ON position (engine off). Inspect the voltage at TCM (wiring harness-side) terminal 2J. Is the terminal voltage within 0.2-4.9 V ?	Yes	Go to the intermittent concern troubleshooting procedure, then go to Step 9. (See INTERMITTENT CONCERN TROUBLESHOOTING .)
3		No	Go to the next step.
4	INSPECT TERMINAL CONDITION Turn the ignition switch to the LOCK position. Disconnect the AT solenoid valve connector. Inspect for bent terminals. Is there any malfunction?	Yes	Repair or replace the terminals, then go to Step 9. If the terminals cannot be repaired, replace the wiring harness, then go to Step 9.
4		No	Go to the next step.
5	INSPECT TFT SENSOR CIRCUIT Turn the ignition switch to the ON position (engine off). Verify if the TCM (wiring harness-side) terminal 2J voltage changes to 4.9 V or more when the AT solenoid valve connector is disconnected. Does the TCM (wiring harness-side) terminal voltage change?	Yes	Go to the next step.
5		No	Go to Step 8.
6	INSPECT CONTROL VALVE BODY CONNECTOR TERMINALS CONDITION Turn the ignition switch to the LOCK position. Disconnect the control valve body connector. Inspect for bent control valve body connector terminals. Are the terminals normal?	Yes	Go to the next step.
6		No	Repair or replace the connector and/or terminal, then go to the next step.
7	INSPECT CONTROL VALVE BODY CONNECTOR CIRCUIT FOR SHORT TO GROUND Inspect for continuity between the control valve body (wiring harness-side) terminal D and body ground. Is there continuity?	Yes	Replace the TFT sensor, then go to Step 9. (See TRANSMISSION FLUID TEMPERATURE (TFT) SENSOR REMOVAL/INSTALLATION .)
7		No	Repair or replace the wiring harness, then go to Step 9.
8	INSPECT AT SOLENOID VALVE CONNECTOR CIRCUIT FOR SHORT TO GROUND Turn the ignition switch to the LOCK position. Inspect for continuity between the AT solenoid valve connector (wiring harness-side) terminal C and body ground. Is there continuity?	Yes	Repair or replace the wiring harness, then go to the next step.
8		No	Go to the next step.
9	VERIFY TROUBLESHOOTING OF DTC P0712 COMPLETED Make sure to reconnect all disconnected connectors. Clear the DTC from the TCM memory using the WDS or equivalent. Drive the vehicle for 150 s or more . Is the same DTC present?	Yes	Replace the TCM, then go to the next step. (See TCM REMOVAL/INSTALLATION .)
9		No	Go to the next step.
10	VERIFY AFTER REPAIR PROCEDURE Perform the "After Repair Procedure". (See AFTER REPAIR PROCEDURE .) Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE .)
10		No	DTC troubleshooting completed.