Diagnostic procedure

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

DTC P0768 - DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	VERIFY RELATED REPAIR INFORMATION AVAILABILITY Check for 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 vehicle is not repaired, go to the next step.
1		No	Go to the next step.
2	INSPECT TERMINAL COMPONENT NO.1 (12-PIN) FOR POOR CONNECTION Turn ignition switch to OFF. Disconnect the terminal component No. 1 (12-pin). Check for poor connection (damaged, pulled-out, terminals, corrosion, etc.). Are terminals okay?	Yes	Go to the next step.
2		No	Repair or replace the terminals, then go to Step 12.
3	INSPECT RESISTANCE Check resistance between terminal component No.1 (12-pin) terminal E (transaxle case side) and body ground. Is resistance within 14-18 ohms? (See SOLENOID VALVE INSPECTION .)	Yes	Go to Step 8.
3		No	Go to the next step.
4	INSPECT COUPLER COMPONENT (10-PIN) FOR POOR CONNECTION Disconnect the coupler component (10-pin) connector. Check for poor connection (damaged, pulled-out, terminals, corrosion, etc.). Is terminal okay?	Yes	Go to the next step.
4		No	Repair or replace the terminal, then go to Step 12.
5	INSPECT RESISTANCE Check resistance between coupler component (10-pin) terminal I (part side) and body ground. Is resistance within 14-18 ohms? (See SOLENOID VALVE INSPECTION .)	Yes	Repair or replace the terminal component No.1 (12-pin), then go to Step 12.
5		No	Go to the next step.
6	INSPECT REDUCTION TIMING SOLENOID VALVE CONNECTOR FOR POOR CONNECTION Disconnect the reduction timing solenoid valve connector. Check for poor connection (damaged, pulled-out, terminals, corrosion, etc.). Is terminal okay?	Yes	Go to the next step.
6		No	Repair or replace the terminal, then go to Step 12.
7	INSPECT RESISTANCE Check resistance between reduction timing solenoid valve connector terminal A (part side) and body ground. Is resistance within 14-18 ohms? (See SOLENOID VALVE INSPECTION .)	Yes	Repair or replace the coupler component (10-pin), then go to Step 12.
7		No	Verify reduction timing solenoid valve installation. If reduction timing solenoid valve is installed correctly, replace the reduction timing solenoid valve, then go to Step 12 (See SOLENOID VALVE REMOVAL/INSTALLATION .)
8	INSPECT TCM CONNECTOR FOR POOR CONNECTION Disconnect the TCM connector. Check for poor connection (damaged, pulled-out, terminals, corrosion, etc.). Are terminals okay?	Yes	Go to the next step.
8		No	Repair the terminals, then go to Step 12.
9	INSPECT TERMINAL COMPONENT NO.1 (12-PIN) CIRCUIT FOR OPEN CIRCUIT Check continuity between TCM terminal 2G (harness-side) and terminal component No.1 (12-pin) terminal E (harness-side). Is there continuity between terminals?	Yes	Go to the next step.
9		No	Repair or replace the harness, then go to Step 12.
10	INSPECT TERMINAL COMPONENT NO.1 (12-PIN) CIRCUIT FOR SHORT TO POWER Turn ignition switch to ON (engine OFF). Check voltage at terminal component No.1 (12-pin) terminal E (harness-side). Is voltage 0 V?	Yes	Go to the next step.
10		No	Repair or replace the harness, then go to Step 12.
11	INSPECT TCM CIRCUIT FOR SHORT TO GROUND Turn ignition switch to OFF. Check continuity between TCM terminal 2G (harness-side) and body ground. Is there continuity?	Yes	Repair or replace the harness, then go to the next step.
11		No	Go to the next step.
12	VERIFY TROUBLESHOOTING OF DTC P0763 COMPLETED Make sure to reconnect all disconnected connectors. Clear DTC from memory using WDS or equivalent. Drive vehicle in D range and make sure that gears shift smoothly from 1GR to 5GR. Is same DTC present?	Yes	Replace the TCM, then go to the next step. (See TCM REMOVAL/INSTALLATION .)
12		No	Go to the next step.
13	VERIFY AFTER REPAIR PROCEDURE Perform "After Repair Procedure". (See AFTER REPAIR PROCEDURE .) Is there any DTC present?	Yes	Go to the applicable DTC inspection.
13		No	Troubleshooting completed.