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Diagnostic Procedures

WARNING: This page is about a different car, the 2003 Cadillac Seville and 2003 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.
  1. Did you perform the Diagnostic System Check-Engine Controls? If yes, go to next step. If no, see DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM.
  2. Is DTC P1635 also set? If yes, see DTC P1635: 5-VOLT REFERENCE 1 CIRCUIT . If no, go to next step.
  3. Start the engine. Observe the EGR POSITION SENSOR parameter with a scan tool. Is the EGR POSITION SENSOR parameter less than 1 percent? If yes, go to next step. If no, go to step  6.
  4. Turn ignition on, with engine off. Command the EGR valve from zero percent to 100 percent with a scan tool. Is the EGR POSITION VARIANCE parameter less than 10 percent? If yes, go to next step. If no, go to step  7.
  5. Observe the Freeze Frame/Failure Records for this DTC. Turn off the ignition for 30 seconds. Operate the vehicle within the Conditions For Running DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records. Did the DTC fail this ignition cycle? If yes, go to next step. If no, see DIAGNOSTIC AIDS .
  6. Turn ignition off. Disconnect the EGR valve. Turn ignition on, with engine off. Observe the EGR POSITION SENSOR parameter with a scan tool. Is the EGR POSITION SENSOR parameter less than 1 percent? If yes, go to next step. If no, go to step  10.
  7. Connect a test light between the EGR valve 5-volt reference circuit and the EGR valve low reference circuit. Does the test light illuminate? If yes, go to next step. If no, go to step  9.
  8. Connect a 3-amp fused jumper wire from the EGR valve 5-volt reference circuit to the EGR valve position signal circuit. Is the EGR POSITION SENSOR parameter on the scan tool more than 99 percent? If yes, go to step  14. If no, go to step  12.
  9. Connect a test light between the EGR valve 5-volt reference circuit and a good ground. Does the test light illuminate? If yes, go to step  11. If no, go to step  13.
  10. Test the EGR valve position signal circuit for a short to voltage. Did you find and correct the condition? If yes, go to step  19. If no, go to step  16.
  11. Test the EGR valve low reference circuit for an open or for high resistance. Did you find and correct the condition? If yes, go to step  19. If no, go to step. 16.
  12. Test the EGR valve position signal circuit for high resistance or for a high resistance short to ground. Did you find and correct the condition? If yes, go to step  19. If no, go to step. 16.
  13. Test the EGR valve 5-volt reference circuit for an open or for high resistance. Did you find and correct the condition? If yes, go to step  19. If no, go to step  15.
  14. Test for an intermittent and/or poor connections at the EGR valve. Did you find and correct the condition? If yes, go to step  19. If no, go to step  17.
  15. Test all 5-volt reference circuits for a short to voltage. Did you find and correct the condition? If yes, go to step  19. If no, go to next step.
  16. Test for an intermittent and/or poor connections at the PCM. Did you find and correct the condition? If yes, go to step  19. If no, go to step  18.
  17. Replace the EGR valve. See EGR VALVE under EMISSION SYSTEMS & SUB-SYSTEMS in REMOVAL & INSTALLATION - DEVILLE & SEVILLE article. Did you complete the replacement? If yes, go to step  19.
  18. Replace PCM. See POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in REMOVAL & INSTALLATION - DEVILLE & SEVILLE article. Did you complete the replacement? If yes, go to next step.
  19. Clear the DTCs with a scan tool. Turn off the ignition for 30 seconds. Start the engine and operate vehicle within the Conditions For Running DTC. You may also operate vehicle within the conditions that you observed from the Freeze Frame/Failure Records. Did the DTC fail this ignition cycle? If yes, go to step  2. If no, go to next step.
  20. Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
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