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Home >> Chevrolet >> 2000 >> Camaro Base, 2D Convertible, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Self-Diagnostics - 3.8L >> Diagnostic Tests >> DTC P0403: EGR Solenoid Control Circuit >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) 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 percent 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. Turn ignition on, with engine off. Using a test light connected to ground, probe solenoid control circuit. Using scan tool, command EGR from zero percent to 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 solenoid control and ground circuits. Using scan tool, command EGR from zero percent to 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 light 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 solenoid control circuit for an open or short to ground. Repair as necessary. After repairs, go to step  13. If circuit is okay, go to step  9.
  7. Check solenoid control circuit for a short to voltage. Repair as necessary. After repairs, go to step  13. If circuit is okay, go to step  9.
  8. Check for faulty connections at EGR. Repair as necessary. After repairs, go to step  13. If connections are okay, go to step  11.
  9. Check PCM for poor connections. Repair as necessary. After repairs, go to step  13. If connections are okay, go to step  12.
  10. Repair solenoid ground circuit. After repairs, go to step  13.
  11. Replace EGR. After replacing EGR valve, go to step  13.
  12. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.
  13. Using scan tool, clear DTCs. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter DTC P0403. Operate vehicle within conditions for setting this DTC. If scan tool indicates that this test ran and passed, system is okay. If scan tool did not indicate that this test ran and passed, go to step  2.
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