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.

DTC P0819 [AW6A-EL] DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA HAS BEEN RECORDED Has the 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 VOLTAGE OF M RANGE SWITCH, UP SWITCH, AND DOWN SWITCH CIRCUIT Turn the ignition switch to the ON position. (engine off) Shift the selector lever to any except M range. Inspect for voltage between TCM short cord connector terminals (wiring harness-side) Terminal G and ground (M range switch) Terminal D and ground (up switch) Terminal K and ground (down switch) Is the voltage B+ ?	Yes	Go to go to Step 13.
3		No	Go to the next step.
4	INSPECT TERMINAL TCM SHORT CORD CONNECTOR FOR POOR CONNECTION Turn the ignition switch to the LOCK position. Disconnect the TCM short cord connector. Inspect for poor connection (such as damaged/pulled-out pins, corrosion). Are terminals normal?	Yes	Go to the next step.
4		No	Replace the couple component, then go to Step 13.
5	INSPECT TCM CONNECTOR FOR POOR CONNECTION Disconnect the TCM connector. Inspect for poor connection (such as damaged/pulled-out pins, corrosion). Are terminals normal?	Yes	Go to the next step.
5		No	Replace the couple component, then go to Step 13.
6	INSPECT TCM SHORT CORD CIRCUIT FOR OPEN CIRCUIT Inspect for continuity between TCM short cord connector terminals and TCM terminals (wiring harness-side). Terminal G and terminal A7 (M range switch) Terminal D and terminal A3 (up switch) Terminal K and terminal A4 (down switch) Is there continuity?	Yes	Go to the next step.
6		No	Repair or replace the harness, then go to Step 13.
7	INSPECT TCM SHORT CORD CIRCUIT FOR SHORT TO GROUND Inspect for continuity between TCM short cord connector terminals (wiring harness-side) and body ground. Terminal G and body ground (M range switch) Terminal D and body ground (up switch) Terminal K and body ground (down switch) Is there continuity?	Yes	Repair or replace the harness, then go to the next step.
7		No	Go to the next step.
8	INSPECT SELECTOR LEVER COMPONENT FOR POOR CONNECTION Disconnect the selector lever component connector. Inspect for poor connection (such as damaged/pulled-out pins, corrosion). Are terminals normal?	Yes	Go to the next step.
8		No	Replace the couple component, then go to Step 13.
9	INSPECT M RANGE SWITCH, UP SWITCH, AND DOWN SWITCH CIRCUIT FOR SHORT TO GROUND Inspect for continuity between selector lever component terminals (wiring harness-side) and body ground. Terminal C and body ground (M range switch) Terminal A and body ground (up switch) Terminal B and body ground (down switch) Is there continuity?	Yes	Repair or replace the harness, then go to Step 13.
9		No	Go to the next step.
10	INSPECT M RANGE SWITCH, UP SWITCH, AND DOWN SWITCH Inspect the M range switch, up switch, and down switch. (See SELECTOR LEVER INSPECTION ) Are the switches normal?	Yes	Go to the next step.
10		No	Replace the selector lever, then go to Step 13. (See SELECTOR LEVER COMPONENT REMOVAL/INSTALLATION .)
11	INSPECT M RANGE SWITCH, UP SWITCH, AND DOWN SWITCH CIRCUIT FOR OPEN CIRCUIT Inspect for continuity between selector lever component terminal D (wiring harness-side) and body ground. Is there continuity?	Yes	Go to the next step.
11		No	Repair or replace the harness, then go to Step 13.
12	INSPECT M RANGE SWITCH, UP SWITCH, AND DOWN SWITCH CIRCUIT FOR OPEN CIRCUIT Inspect for continuity between TCM short cord connector terminals and selector lever component terminals (wiring harness-side). Terminal G and terminal C (M range switch) Terminal D and terminal A (up switch) Terminal K and terminal B (down switch) Is there continuity?	Yes	Go to the next step.
12		No	Repair or replace the harness, then go to the next step.
13	VERIFY TROUBLESHOOTING OF DTC P0819 COMPLETED Make sure to reconnect all the disconnected connectors. Clear the DTC from the memory using the WDS or equivalent. Drive the vehicle in M range, and change gears by shifting the selector lever (operating the up and down switches). Is 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	Troubleshooting completed.