Diagnostic Procedure

DTC P0403 DIAGNOSTIC PROCEDURE TABLE

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 EGR VALVE FOR POOR CONNECTION Turn the ignition switch off. Disconnect 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 the ignition switch to the ON position (Engine off). Measure the voltage following terminal and body ground. EGR valve terminal C EGR valve terminal D Is the 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 Inspect the EGR valve. (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. (See EGR VALVE REMOVAL/INSTALLATION .)
6	INSPECT FOR CONTROL CIRCUIT FOR SHORT TO GROUND Turn the ignition switch off. Inspect for continuity between the following terminal and body ground: EGR valve terminal E EGR valve terminal A EGR valve terminal B EGR valve terminal F is there continuity?	Yes	Repair or replace the wiring harness for 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 following terminal and body ground: EGR valve terminal E EGR valve terminal A EGR valve terminal B EGR valve terminal F Is the voltage B+ ?	Yes	Repair or replace the wiring harness for short to power supply, then go to Step 10.
7		No	Go to the next step.
8	INSPECT PCM FOR POOR CONNECTION Turn the ignition switch off. Disconnect the 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 the PCM connector connected. Inspect for continuity following terminals: Between EGR valve terminal E and PCM terminal 2K Between EGR valve terminal A and PCM terminal 2G Between EGR valve terminal B and PCM terminal 2L Between EGR valve terminal F and PCM terminal 2H Is there continuity?	Yes	Go to the next step.
9		No	Repair or replace the wiring harness for an 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. Start the engine. 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 DTC present?	Yes	Go to the applicable DTC troubleshooting. (See DTC TABLE .)
11		No	Troubleshooting completed.