Diagnostic procedure

DTC P0403 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 FREEZE FRAME DATA on the repair order, then go to the next step.
2	VERIFY RELATED REPAIR INFORMATION AVAILABILITY Check for related Service Bulletins and/or online repair information availability. Is any related repair information available?	Yes	Perform the 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 EGR VALVE CONNECTOR FOR POOR CONNECTION Turn the ignition switch off. Disconnect the EGR valve connector. Inspect for poor connection (such as damaged/pulled-out pins, corrosion). Is there any malfunction?	Yes	Repair or replace the terminals and/or connector, then go to Step 10.
3		No	Go to the next step.
4	INSPECT POWER CIRCUIT FOR OPEN CIRCUIT Turn ignition switch to the ON position (Engine off). Measure the voltage following the terminal and body ground. EGR valve terminal C (harness-side) EGR valve terminal D (harness-side) Is voltage B+ ?	Yes	Go to the next step.
4		No	Repair or replace the wiring harness for an open circuit then go to Step 10.
5	INSPECT EGR VALVE Perform the EGR valve inspection. (See EGR VALVE INSPECTION ). Is the EGR valve normal?	Yes	Go to the next step.
5		No	Replace the EGR valve, then go to Step 10.
6	INSPECT FOR CONTROL CIRCUIT FOR SHORT TO GROUND Turn the ignition switch off. Inspect for continuity between the following terminals and body ground: EGR valve terminal E (harness-side) EGR valve terminal A (harness-side) EGR valve terminal B (harness-side) EGR valve terminal F (harness-side) is there continuity?	Yes	Repair or replace the wiring harness for a short to ground, then go to Step 10.
6		No	Go to the next step.
7	INSPECT FOR CONTROL CIRCUIT FOR SHORT TO POWER SUPPLY Turn the ignition switch to the ON position (Engine off). Measure the voltage between the following terminals and body ground: EGR valve terminal E (harness-side) EGR valve terminal A (harness-side) EGR valve terminal B (harness-side) EGR valve terminal F (harness-side) Is voltage B+ ?	Yes	Repair or replace wiring harness for a short to power supply, then go to Step 10.
7		No	Go to the next step.
8	INSPECT PCM CONNECTOR FOR POOR CONNECTION Turn the ignition switch off. Disconnect PCM connector. Inspect for poor connection (such as damaged/pulled-out pins, corrosion). Is there any malfunction?	Yes	Repair or replace the terminals and/or connector, then go to Step 10.
8		No	Go to the next step.
9	INSPECT CONTROL CIRCUIT FOR OPEN CIRCUIT Remove the PCM with PCM connector connected. Inspect for continuity between the following terminals (harness-side): Between EGR valve terminal E and PCM terminal 4D Between EGR valve terminal A and PCM terminal 4G Between EGR valve terminal B and PCM terminal 4J Between EGR valve terminal F and PCM terminal 4M Is there continuity?	Yes	Go to the next step.
9		No	Repair or replace harness for open circuit then go to the next step.
10	VERIFY TROUBLESHOOTING OF DTC P0403 COMPLETED Make sure to reconnect all disconnected connectors. Clear the DTC from the PCM memory using the WDS or equivalent. Turn the ignition switch off. Start the engine and warm it up completely. Is the PENDING CODE for this DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION ).
10		No	Go to the next step.
11	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 ).
11		No	Troubleshooting completed.