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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 P0404: EGR Valve Desired Position Not Met >> 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.
    NOTE: If DTC P0403 or P0405 are also set, diagnose those DTCs first. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .
  2. Turn ignition on. Using scan tool, command EGR valve from zero to 100 percent. If EGR position sensor remain within 15 percent of desired EGR position at all commanded positions, go to next step. If EGR position sensor does not remain within 15 percent of 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 connector. Using scan tool, monitor EGR valve position sensor. If EGR valve position sensor is zero percent, go to next step. If EGR valve position sensor is not zero percent, go to step  8.
  5. Using DVOM, measure voltage between ground and EGR valve connector terminals "B" (Black wire) and "D" (Gray wire). If voltage is approximately 5 volts, go to next step. If voltage is not approximately 5 volts, go to step  7.
  6. Connect a fused jumper between EGR valve connector terminals "C" (Brown wire) and "D" (Gray wire). Monitor EGR valve position sensor. If EGR valve position sensor is 100 percent, go to step  12. If EGR valve position sensor is not 100 percent, go to step  10. If fused jumper blows, repair short to ground in Brown wire between EGR valve connector terminal "C" and PCM connector C1 terminal No. 28. See Figure.
  7. Using DVOM, measure voltage between ground and EGR valve connector terminal "D" (Gray wire). If voltage is approximately 5 volts, go to step  9. If voltage is not approximately 5 volts, go to step  11.
  8. Check for short to voltage in Brown wire between EGR valve connector terminal "C" and PCM connector C1 terminal No. 28. See Figure. Repair as necessary. After repairs, go to step  16. If circuit is okay, go to step  13.
  9. Check for open or high resistance in Black wire between EGR valve connector terminal "B" and PCM connector C1 terminal No. 31. See Figure. Repair as necessary. After repairs, go to step  16. If circuit is okay, go to step  13.
  10. Check for open or high resistance in Brown wire between EGR valve connector terminal "C" and PCM connector C1 terminal No. 28. See Figure. Repair as necessary. After repairs, go to step  16. If circuit is okay, go to step  14.
  11. Check for open short to ground or short to voltage in Gray wire between EGR valve connector terminal "D" and PCM connector C2 terminal No. 33. See Figure. Repair as necessary. After repairs, go to step  16. If circuit is okay, go to step  14.
  12. Check for poor connections at EGR valve connector. Repair as necessary. After repairs, go to step  16. If circuit is okay, go to step  14.
  13. Check for poor connections at PCM. Repair as necessary. After repairs, go to step  16. If circuit is okay, go to step  15.
  14. Replace EGR valve. After repairs, go to step  16.
  15. Replace PCM. See REMOVAL, OVERHAUL & INSTALLATION - CARS article. After repairs, go to next step.
  16. 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.
  17. 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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