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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 P1404: EGR Closed Position Performance >> 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. NOTE: If DTC P0403 is set, diagnose DTC P0403 first. Go to DTC P0403: EGR CONTROL CIRCUIT MALFUNCTION .
  2. Start engine. Using scan tool, observe EGR position sensor parameter. If EGR position sensor parameter is zero percent, go to next step. If EGR position sensor parameter is not zero percent, go to step  5.
  3. Turn ignition on, with engine off. Using scan tool, command EGR valve from zero to 100 percent. If desired EGR position remains within 15 percent of EGR position sensor at all commanded positions, go to next step. If desired EGR position does not remain within 15 percent of EGR position sensor at all commanded positions, go to step  6.
  4. Observe the FREEZE FRAME/FAILURE RECORDS for this DTC. Turn ignition off for 30 seconds. Operate vehicle within the conditions for running the DTC or within the parameters observed in FREEZE FRAME/FAILURE RECORDS. If DTC fails this ignition cycle, go to next step. If DTC does not fail this ignition cycle, see DIAGNOSTIC AIDS .
  5. Turn ignition off. Disconnect EGR valve connector. Turn ignition on, with engine off. Using scan tool, observe EGR position sensor parameter. If EGR position sensor parameter is at zero percent, go to next step. If EGR sensor parameter is not at zero percent, go to step  9.
  6. Check voltage between EGR valve connector terminals "B" (Black wire) and "C" (Brown wire). If voltage reading is about 5 volts, go to next step. If voltage reading is not about 5 volts, go to step  8.
  7. Connect a fused jumper wire between EGR valve connector terminals "A" (Gray wire) and "C" (Brown wire). If scan tool indicates that EGR position sensor parameter is about 100 percent, go to step  13. If scan tool does not indicate that EGR position sensor parameter is about 100 percent, go to step  11.
  8. Check voltage between a known-good ground and EGR valve connector terminal "C" (Brown wire). If voltage reading is about 5 volts, go to step  10. If voltage reading is not about 5 volts, go to step  12.
  9. Check for short to voltage in Brown wire between EGR valve and PCM. Repair as necessary. After repairs, go to step  17. If circuit is okay, go to step  14.
  10. Check for open or high resistance in Black wire between EGR valve and PCM. Repair as necessary. After repairs, go to step  17. If circuit is okay, go to step  14.
  11. Check for high resistance or short to ground in Brown wire between EGR valve and PCM. Repair as necessary. After repairs, go to step  17. If circuit is okay, go to step  15.
  12. Check for open, short to ground, or short to voltage in Gray wire between EGR valve and PCM. Repair as necessary. After repairs, go to step  17. If circuit is okay, go to step  15.
  13. Check for poor connections at EGR valve connector. Repair as necessary. After repairs, go to step  17, If connections are okay, go to step  15.
  14. Check for poor connections at PCM connector. Repair as necessary. After repairs, go to step  17. If connections are okay, go to step  16.
  15. Replace EGR valve. After replacing EGR valve, go to next step.
  16. Replace PCM. Perform PCM relearn procedure. See POWERTRAIN CONTROL MODULE PROGRAMMING  under PROGRAMMING. After replacing PCM, go to next step.
  17. Using scan tool, clear DTCs. Turn ignition off for at least 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.
  18. 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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