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Home >> Chevrolet >> 2001 >> Camaro Base, 2D Convertible, Automatic >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Control System Self-Diagnostics - 3.8L >> Diagnostic Tests >> DTC P0403: EGR Control Circuit Malfunction >> Diagnostic Procedures

Diagnostic Procedures

  1. If powertrain diagnostic system check was performed, go to next step. If powertrain diagnostic system check was not performed, go to POWERTRAIN DIAGNOSTIC SYSTEM CHECK  under DIAGNOSTIC SYSTEM CHECKS. After performing powertrain diagnostic system check, go to next step.
  2. Turn ignition on. Using scan tool, command EGR valve from zero to 100 percent. If EGR position sensor is close to desired EGR position at all commanded positions, go to next step. If EGR position sensor is not close to desired EGR position at all commanded positions, go to step  4.
  3. Turn ignition on, with engine off. Using scan tool, review FREEZE FRAME and/or FAILURE RECORDS data and note parameters. Turn ignition off for about 30 seconds. Start engine and operate vehicle within conditions required for this diagnostic to run, and as close to conditions recorded in FREEZE FRAME/FAILURE RECORDS as possible. Select DTC function then enter this DTC. If scan tool indicates that this test failed this ignition, go to next step. If scan tool does not indicate that this test failed this ignition, see DIAGNOSTIC AIDS .
  4. Turn ignition off. Disconnect EGR valve electrical connector. Turn ignition on. Connect test light between ground and EGR valve connector terminal "E" (Light Blue wire). Using scan tool, command EGR valve from zero to 100 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  6.
  5. Connect test light between EGR valve connector terminals "A" (Gray wire) and "E" (Light Blue wire). Using scan tool, command EGR valve from zero to 100 percent. If test light turns on and off with each command, go to step  10. If test light does not turn on and off with each command, go to step  9.
  6. If test light remains illuminated with each command, go to step  8. If test light does not remain illuminated with each command, go to next step.
  7. Check for short to ground or open in Light Blue wire between EGR valve connector terminal "E" and PCM connector C2 terminal No. 4. See Figure. Repair as necessary. After repairs, go to step  14. If circuit is okay, go to step  11.
  8. Check for short to voltage in Light Blue wire between EGR valve connector terminal "E" and PCM connector C2 terminal No. 4. See Figure. Repair as necessary. After repairs, go to step  14. If circuit is okay, go to step  11.
  9. Check for open or high resistance in Gray wire between EGR valve connector terminal "A" and PCM connector C1 terminal No. 32. See Figure. Repair as necessary. After repairs, go to step  14. If circuit is okay, go to step  11.
  10. Check for poor connections at EGR valve connector. Repair as necessary. After repairs, go to step  14. If circuit is okay, go to step  12.
  11. Check for poor connections at PCM. Repair as necessary. After repairs, go to step  14. If circuit is okay, go to step  13.
  12. Replace EGR valve. After repairs, go to step  14.
  13. Replace PCM. See REMOVAL, OVERHAUL & INSTALLATION - CARS article. After repairs, go to next step.
  14. Using scan tool, clear DTCs. Turn ignition off for 30 seconds. Start engine and allow it to reach normal operating temperature. Operate vehicle within conditions for setting this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool does not indicate that this test ran and passed, go to step  2.
  15. Using scan tool, select CAPTURE INFO, REVIEW INFO function. If any undiagnosed DTCs are displayed, go to applicable DTC test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no undiagnosed DTCs are displayed, system is okay.
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