Diagnostic procedure

DTC P0403 - 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 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.
1		No	Go to the next step.
2	CLASSIFY INTERMITTENT CONCERN OR CONTINUOUS CONCERN Turn key to OFF then ON (Engine off). Is same DTC present?	Yes	Go to the next step.
2		No	Refer to intermittent concern. (See INTERMITTENT CONCERN TROUBLESHOOTING .)
3	INSPECT POOR CONNECTION OF EGR VALVE Turn the ignition switch off. Disconnect EGR valve connector. Check for poor connection (damaged, pulled-out terminals, corrosion, etc.). Is there any malfunction?	Yes	Repair or replace terminals and/or connector, then go to Step 8.
3		No	Go to the next step.
4	INSPECT POWER CIRCUIT FOR OPEN CIRCUIT Turn key to ON (Engine off). Measure following EGR valve power circuit terminal voltage. EGR valve terminal C and body ground EGR valve terminal D and body ground Is voltage B+ ?	Yes	Go to the next step.
4		No	Repair or replace harness for open circuit then go to Step 8.
5	INSPECT EGR VALVE Measure resistance between following EGR valve terminals (part-side) C and E C and A D and B D and F Is resistance approx. 22 ohms ?	Yes	Go to the next step.
5		No	Replace EGR valve, then go to Step 8.
6	INSPECT FOR CONTROL CIRCUIT FOR SHORT TO GROUND Check continuity following EGR valve control circuit. EGR valve terminal E and body ground EGR valve terminal A and body ground EGR valve terminal B and body ground EGR valve terminal F and body ground Is there continuity?	Yes	Repair or replace harness for short to ground, then go to Step 8.
6		No	Go to the next step.
7	INSPECT CONTROL CIRCUIT FOR OPEN CIRCUIT Connect breakout box with PCM disconnected. Check continuity following EGR control circuit. EGR valve terminal E and breakout box terminal 98 EGR valve terminal A and breakout box terminal 99 EGR valve terminal B and breakout box terminal 72 EGR valve terminal F and breakout box terminal 73 Is there continuity?	Yes	Go to the next step.
7		No	Repair or replace harness for open circuit then go to the next step
8	VERIFY TROUBLESHOOTING OF DTC P0403 COMPLETED Make sure to reconnect all disconnected connectors. Turn key to OFF then ON (Engine off). Is same DTC present?	Yes	Replace PCM, then go to the next step.
8		No	Go to the next step.
9	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 .)
9		No	Troubleshooting completed.