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 P0753 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	INSPECT AT SOLENOID VALVE CONNECTOR FOR POOR CONNECTION Turn the ignition switch to the LOCK position. Disconnect the AT solenoid valve connector. Inspect for poor connection (such as damaged/pulled-out pins, corrosion). Are the connector and terminals normal?	Yes	Go to the next step.
3		No	Repair or replace the connector and/or terminal, then go to Step 13.
4	INSPECT RESISTANCE OF SHIFT SOLENOID VALVE A Inspect the resistance between AT solenoid valve connector (transmission case side) terminal E and body ground. Is the resistance within 2.2-5.0 ohms ? (See SOLENOID VALVE INSPECTION .)	Yes	Go to Step 9.
4		No	Go to the next step.
5	INSPECT CONTROL VALVE BODY CONNECTOR FOR POOR CONNECTION Disconnect the control valve body connector. Inspect for poor connection (such as damaged/pulled-out pins, corrosion). Are the connector and terminals normal?	Yes	Go to the next step.
5		No	Repair or replace the connector and/or terminal, then go to Step 13.
6	INSPECT RESISTANCE OF SHIFT SOLENOID VALVE A Inspect the resistance between control valve body (part-side) terminal I and body ground. Is the resistance within 2.2-5.0 ohms ? (See SOLENOID VALVE INSPECTION .)	Yes	Repair or replace the AT solenoid valve connector harness, then go to Step 13.
6		No	Go to the next step.
7	INSPECT SHIFT SOLENOID VALVE A CONNECTOR FOR POOR CONNECTION Disconnect the shift solenoid valve A connector. Inspect for poor connection (such as damaged/pulled-out pins, corrosion). Are the connector and terminals normal?	Yes	Go to the next step.
7		No	Repair or replace the connector and/or terminal, then go to Step 13.
8	INSPECT RESISTANCE OF SHIFT SOLENOID VALVE A Inspect the resistance between shift solenoid valve A (part-side) terminal A and body ground. Is the resistance within 2.2-5.0 ohms ? (See SOLENOID VALVE INSPECTION .)	Yes	Repair or replace the control valve body connector harness, then go to Step 13.
8		No	Verify shift solenoid valve A installation. If shift solenoid valve A is installed correctly, replace shift solenoid valve A, then go to Step 13. (See SOLENOID VALVE REMOVAL/INSTALLATION .)
9	INSPECT TCM CONNECTOR FOR POOR CONNECTION Disconnect the TCM connector. Inspect for poor connection (such as damaged/pulled-out pins, corrosion). Are the connector and terminals normal?	Yes	Go to the next step.
9		No	Repair or replace the connector and/or terminal, then go to Step 13.
10	INSPECT AT SOLENOID VALVE CONNECTOR CIRCUIT FOR OPEN CIRCUIT Inspect for continuity between the TCM (wiring harness-side) terminal 2Y and AT solenoid valve connector (wiring harness-side) terminal E. Is there continuity between the terminals?	Yes	Go to the next step.
10		No	Repair or replace the wiring harness, then go to Step 13.
11	INSPECT AT SOLENOID VALVE CONNECTOR CIRCUIT FOR SHORT TO POWER SUPPLY Turn the ignition switch to the ON position (engine off). Inspect the voltage at the AT solenoid valve connector (wiring harness-side) terminal E. Is the voltage 0 V ?	Yes	Go to the next step.
11		No	Repair or replace the wiring harness, then go to Step 13.
12	INSPECT TCM CIRCUIT FOR SHORT TO GROUND Turn the ignition switch to the LOCK position. Inspect for continuity between the TCM (wiring harness-side) terminal 2Y and body ground. Is there continuity?	Yes	Repair or replace the wiring harness, then go to the next step.
12		No	Go to the next step.
13	VERIFY TROUBLESHOOTING OF DTC P0753 COMPLETED Make sure to reconnect all disconnected connectors. Clear the DTC from the TCM memory using the WDS or equivalent. Drive the vehicle in D range and make sure that the gears shift smoothly from 1GR to 4GR. Is the same DTC present?	Yes	Replace the TCM, then go to the next step. (See TCM REMOVAL/INSTALLATION .)
13		No	Go to the next step.
14	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 .)
14		No	DTC troubleshooting completed.