Possible Causes
- GOOD TRIP EQUAL TO ZERO
- EGR VALVE OPEN AT IDLE
- EGR VALVE ASSEMBLY INSPECTION
- EGR SOLENOID ASSEMBLY
- EGR SOLENOID GROUND CIRCUIT OPEN
- EGR SOLENOID CONTROL CKT SHORT TO GND
- EGR SOLENOID CONTROL CKT SHORTED TO VOLTAGE
- EGR SOLENOID CONTROL CKT OPEN
- PCM - EGR OPEN
- PCM - EGR CLOSED