Possible Causes

GOOD TRIP EQUAL TO ZERO

EGR SOLENOID ASSEMBLY

EGR SOLENOID GROUND CIRCUIT OPEN

EGR SOLENOID CONTROL CIRCUIT SHORTED TO VOLTAGE

EGR SOLENOID CONTROL CIRCUIT SHORT TO GND

EGR SOLENOID CONTROL CIRCUIT SHORTED TO SENSOR GROUND CIRCUIT

EGR SOLENOID CONTROL CIRCUIT OPEN

PCM

DIAGNOSTIC PROCEDURE - P0403 - EGR CONTROL CIRCUIT

TEST	ACTION
1	Ignition on, engine not running. With the DRBIII®, read DTCs and record the related Freeze Frame data. Is the Good Trip displayed and equal to zero? Yes --> Go To 2 No --> Refer to the INTERMITTENT CONDITION symptom in the Driveability category. Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC .
2	Turn the ignition off. Disconnect the EGR Solenoid harness connector. Turn the ignition on. Turn all accessories off. Using a 12 volt Test Light connected to the EGR Solenoid ground circuit, probe the EGR Solenoid Control circuit. With the DRB, actuate the EGR solenoid. Does the 12-volt test light flash on and off? Yes --> Replace the EGR Solenoid Assembly. Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC . No --> Go To 3
3	Turn the ignition off. Disconnect the EGR Solenoid harness connector. Disconnect the PCM harness connector. Using a 12-volt Test Light connected to the EGR Solenoid ground circuit, probe the EGR Solenoid Control circuit in the EGR Solenoid harness connector. Does the test light illuminate? Yes --> Go To 4 No --> Repair the open in the EGR Solenoid ground circuit. Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC .
4	Turn the ignition off. Disconnect the EGR Solenoid harness connector. Disconnect the PCM harness connector. Turn the ignition on. Measure the voltage on the EGR Solenoid Control circuit in the EGR Solenoid connector. Is the voltage above 1.0 volt? Yes --> Repair the short to voltage in the EGR Solenoid Control circuit. Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC . No --> Go To 5
5	Turn the ignition off. Disconnect the PCM harness connector. Disconnect the EGR Solenoid harness connector. Measure the resistance between ground and the EGR Solenoid Control circuit at the EGR Solenoid harness connector. Is the resistance below 100 ohms? Yes --> Repair the short to ground in the EGR Solenoid Control circuit. Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC . No --> Go To 6
6	Turn the ignition off. Disconnect the PCM harness connector. Disconnect the EGR Solenoid harness connector. Measure the resistance between the EGR Solenoid Control circuit and Sensor ground circuit at the EGR Solenoid connector. Is the resistance below 5.0 ohms? Yes --> Repair the short to Sensor ground in the EGR Solenoid Control circuit. Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC . No --> Go To 7
7	Turn the ignition off. Disconnect the PCM harness connector. Disconnect the EGR Solenoid harness connector. CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMINALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS. Measure the resistance of the EGR Solenoid Control circuit from the EGR Solenoid harness connector to the appropriate terminal of special tool #8815. Is the resistance below 5.0 ohms? Yes --> Go To 8 No --> Repair the open in the EGR Solenoid Control circuit. Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC .
8	NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary. If there are no possible causes remaining, view repair.Repair:Replace and program the Powertrain Control Module in accordance with the Service Information.Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC .