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Home >> Chevrolet >> 2000 >> Venture Plus >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics >> Diagnostic Tests >> DTC P0403: EGR Solenoid Control Circuit >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing OBD system check, go to next step.
  2. Turn ignition on, with engine off. Using scan tool, command EGR from zero to 10 percent. If solenoid turns on and off with each command, see DIAGNOSTIC AIDS . If solenoid does not turn on and off with each command, go to next step.
  3. Turn ignition off. Disconnect EGR harness connector. Turn ignition off, with engine off. Using a test light connected to ground, probe EGR solenoid control circuit. Using scan tool, command EGR between zero and 10 percent. If test light turns on and off with each command, go to next step. If test light does not turn on and off with each command, go to step  5.
  4. Connect test light between EGR solenoid control and ground circuits. Using scan tool, command EGR between zero and 10 percent. If test light turns on and off with each command, go to step  8. If test light does not turn on and off with each command, go to step  10.
  5. If test lamp remains illuminated with each command, go to step  7. If test light does not remain illuminated with each command, go to next step.
  6. Check for short to ground or open in EGR solenoid control circuit. Repair as necessary. After repairs, go to step  13. If circuit is okay, go to step  9.
  7. Check for short to voltage in EGR solenoid control circuit. Repair as necessary. After repairs, go to step  13. If circuit is okay, go to step  9.
  8. Check for poor connections at EGR solenoid connector. Repair as necessary. After repairs, go to step  13. If connections are okay, go to step  11.
  9. Check for poor connections at PCM connector. Repair as necessary. After repairs, go to step  13. If connections are okay, go to step  12.
  10. Repair EGR solenoid ground circuit. After repairs, go to step  13.
  11. Replace EGR valve. After replacing EGR valve, go to step  13.
  12. Replace PCM. Program replacement PCM using required equipment. After replacing ECM, go to next step.
  13. Using scan tool, clear DTCs. Operate vehicle within conditions for setting this DTC. Recheck for DTCs. If DTC resets, go to step  2. If DTC does not reset, system is okay.
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