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DTC P0403: EGR Solenoid Circuit: Testing

  1. Turn the ignition on. With the DRBIII®, read DTCs. Is the Good Trip counter displayed and equal to zero? If yes, go to next step. If no, go to step  8.
  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 Fused Ignition Switch Output circuit, probe the EGR Solenoid Control circuit at the EGR Solenoid harness connector. With the DRBIII®, actuate the EGR solenoid. Does the 12-volt test light flash on and off? If yes, inspect the EGR Valve Back Pressure hose and tube for obstructions or damage. If okay, replace the EGR Solenoid. If no, go to next step.
  3. Turn the ignition on. Using a 12-volt test light connected to ground, probe the Fused Ignition Switch Output circuit in the EGR Solenoid harness connector. Does the 12-volt test light illuminate? If yes, go to next step. If no, repair the Fused Ignition Switch Output circuit for an open.
  4. Measure the voltage on the EGR Solenoid Control circuit in the EGR Solenoid harness connector. Is the voltage above 1.0 volt? If yes, repair the EGR Solenoid Control circuit for a short to voltage. If no, go to next step.
  5. Turn the ignition off. Disconnect the PCM C1 harness connector. Measure the resistance of the EGR Solenoid Control circuit in the EGR Solenoid harness connector to ground. Is the resistance below 5.0 ohms? If yes, repair the EGR Solenoid Control circuit for a short to ground. If no, go to next step.
  6. Measure the resistance of the EGR Solenoid Control circuit between the PCM C1 harness connector and the EGR Solenoid harness connector. Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the EGR Solenoid Control circuit for an open.
  7. There are no possible causes remaining, replace PCM. Program the new PCM. See PROGRAMMING .
    8. WARNING: When the engine is operating, do not stand in a direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing.
  8. The conditions that set the DTC are not present at this time. The following may help in identifying the intermittent condition. With the engine running at normal operating temperature, monitor the DRBIII® parameters related to the DTC while wiggling the wiring harness. Look for parameter values to change and/or a DTC to set. Review the DRBIII® Freeze Frame information. If possible, try to duplicate the conditions under which the DTC was set. Refer to any Technical Service Bulletins (TSB) that may apply. Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals. Were any of the above conditions present? If yes, repair as necessary. If no, test is complete.
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