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Home >> Chevrolet >> 2001 >> Camaro Base, 2D Convertible, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 7 (Engine Control System Self-Diagnostics - 5.7L) >> Diagnostic Tests >> DTC P1404: EGR Closed Position Performance ("F" Body) >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2000 Pontiac Firebird, 2000 Chevrolet Corvette, and 2000 Chevrolet Camaro. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK . After performing OBD system check, go to next step.
  2. Start and operate engine at idle. Using scan tool, monitor FAILED THIS IGNITION under DTC INFORMATION option. If scan tool indicates that DTC P1635 failed in this ignition cycle, diagnose DTC P1635. See DTC P1635: 5-VOLT REFERENCE NO. 1 CIRCUIT . If scan tool does not indicate that DTC P1635 failed in this ignition cycle, go to next step.
  3. With engine at idle, observe idle quality. If idle quality is poor, go to next step. If idle quality is okay, go to step  5.
  4. Disconnect EGR harness connector. If idle quality returns to normal, go to step  13. If idle quality does not return to normal, go to step  15.
  5. Turn ignition on, engine off. Using scan tool, observe EGR pintle position voltage. If EGR pintle position voltage is 0.14-1.07 volts, go to next step. If EGR pintle position voltage is not 0.14-1.07 volts, go to step  7.
  6. Turn ignition on, engine off. Select FREEZE FRAME and/or FAILURE RECORDS data for this DTC and record parameters. Turn ignition off for 15 seconds. Start and operate vehicle within conditions required for this diagnostic to run and as close to FREEZE FRAME/FAILURE RECORDS as possible. Select DTC option and SPECIFIC DTC option, then enter this DTC. If scan tool indicates that this DTC failed this ignition cycle, go to next step. If scan tool does not indicate that this DTC failed this ignition cycle, see DIAGNOSTIC AIDS .
  7. Disconnect EGR valve harness connector. Using scan tool, observe EGR pintle position voltage. If EGR position voltage is 0.14 volt, go to next step. If EGR position voltage is not 0.14 volt, go to step  10.
  8. Using test light connected to ground, probe test light to EGR pintle position ground circuit at harness connector. If test light illuminates, go to next step. If test light does not illuminate, go to step  11.
  9. Check voltage between ground and 5-volt reference circuit at EGR harness connector. If voltage reading is greater than 5 volts, go to step  14. If voltage reading is not greater than 5 volts, go to step  16.
  10. Turn ignition off. Disconnect PCM connector. Check for short in EGR signal circuit. Repair as necessary. After repairs, go to step  18. If circuit is okay, go to step  17.
  11. Check for open in EGR pintle position ground circuit. Repair as necessary. After repairs, go to step  18. If circuit is okay, go to next step.
  12. Turn ignition off. Disconnect PCM harness connector. Check EGR pintle position ground circuit for good connection to PCM. Repair as necessary. After repairs, go to step  18. If connection is okay, go to step  17.
  13. Disconnect PCM harness connector. Check for short to voltage in EGR 5-volt reference circuit. Repair as necessary. After repairs, go to step  18. If circuit is okay, go to step  17.
  14. Repair 5-volt reference circuit for short to voltage. After repairs, go to step  18.
  15. Remove EGR valve. Inspect and clean pintle. After cleaning EGR valve, go to step  18. If debris was not found in EGR valve pintle, go to next step.
  16. Replace EGR valve. After replacing EGR valve, go to step  18.
  17. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.
  18. Using scan tool, select CLEAR INFO or CLEAR DTCs function to clear DTCs. Start engine and allow it to idle. Ensure engine is at normal operating temperature. Operate vehicle within conditions required for setting this DTC. Select SPECIFIC DTC function then enter this DTC. If scan tool indicates TEST RAN AND PASSED, go to next step. If scan tool does not indicate TEST RAN AND PASSED, repeat step  2.
  19. If any other DTCs are set, diagnose DTCs as necessary. If no other DTCs are set, no problem is indicated at this time. See DIAGNOSTIC AIDS .
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