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Diagnostic Procedures

WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. 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. If this DTC set after an ECM reflash; Connect a scan tool. Turn ON the ignition, with the engine OFF. Observe the Glow Plug System Type parameter on the scan tool. Does the scan tool display the Glow Plug System Type as California? If yes, go to next step. If no, see DTC P0380: GLOW PLUG CIRCUIT PERFORMANCE (FED) .
  3. Did DTC P0489, P0540, P2141, and P2144 also set? If yes, go to step  16. If no, go to next step.
  4. Connect a scan tool. Turn ON the ignition, with the engine OFF. Use the scan tool in order to command the glow plugs ON and OFF. Observe the glow plug feedback parameter on the scan tool. Does the scan tool display the glow plug feedback parameter as 5.0-5.6 V? If yes, go to step  8. If no, go to next step.
  5. Does the scan tool display a glow plug voltage more than 5.6 V? If yes, go to step  22. If no, go to next step.
  6. Does the scan tool display a glow plug voltage more than 0.70 V? If yes, go to step  11. If no, go to next step.
  7. Turn ON the ignition, with the engine OFF. Touch the battery feed stud on the glow plug relay with an unpowered test lamp connected to ground. Does the test lamp illuminate? If yes, go to step  9. If no, go to step  25.
  8. The DTC is intermittent. If no additional DTCs are stored, see DIAGNOSTIC AIDS . If any additional DTCs were stored, refer to those tables. Were there any additional DTCs stored? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no,
  9. Disconnect the glow plug relay middle connector. Turn ON the ignition, with the engine OFF. With an unpowered test lamp connected to ground, probe the glow plug relay harness ignition feed circuit. Does the test lamp illuminate? If yes, go to next step. If no, go to step  17.
  10. Turn ON the ignition, with the engine OFF. Connect an unpowered test lamp to battery voltage, probe the glow plug relay harness ground circuit. Does the test lamp illuminate? If yes, go to next step. If no, go to step  18.
  11. Turn ON the ignition, with the engine OFF. Verify that the glow plug relay harness is disconnected. With an unpowered test lamp connected to ground, probe the glow plug relay control circuit at the glow plug relay harness connector. Use a scan tool in order to command the glow plugs ON and OFF. Does the test lamp illuminate with the scan tool command ON? If yes, go to step  13. If no, go to next step.
  12. Does the test lamp illuminate all of the time? If yes, go to step  24. If no, go to step  19.
  13. Verify that the glow plug relay is still disconnected. Turn ON the ignition, with the engine OFF. Using the J 35616-A Connector Test Adapter Kit, jumper the glow plug control circuit to the glow plug signal circuit scan tool. Use a scan tool in order to command the glow plugs ON. Observe the scan tool while the glow plugs are commanded ON. Does the glow plug parameter voltage measure near Battery Voltage? If yes, go to next step. If no, go to step  21.
  14. Turn OFF the ignition. Disconnect the right and left bank glow plug output circuit connectors at the glow plug relay. With an unpowered test lamp connected to battery voltage, probe each circuit. Does the test lamp illuminate for each circuit? If yes, go to step  27. If no, go to next step.
  15. Turn OFF the ignition. Disconnect each glow plug connector at the glow plug that did not illuminate the test lamp. With an unpowered test lamp connected to battery voltage, probe the terminal on the glow plug. Does each glow plug illuminate the test lamp? If yes, go to step  27. If no, go to step  26.
  16. Repair the open or short to ground between the fuel heater fuse and the supplied components. After repairs, go to step  30.
  17. Repair an open in the glow plug relay ignition 1 voltage circuit. After repairs, go to step  30.
  18. Repair the open circuit or poor connections in the glow plug relay harness ground circuit. After repairs, go to step  30.
  19. Inspect the glow plug relay control circuit for an open or short to ground and repair as necessary. Did you find and correct the condition? If yes, go to step  30. If no, go to next step.
  20. Inspect the glow plug relay control circuit for a proper connection at the ECM and replace the terminal if necessary. Did you find and correct the condition? If yes, go to step  30. If no, go to step  29.
  21. Inspect the glow plug relay signal circuit for an open or short to ground and repair as necessary. Did you find and correct the condition? If yes, go to step  30. If no, go to step  28.
  22. Inspect the glow plug relay signal circuit for a proper connection at the ECM and replace the terminal if necessary. Did you find an improper connection and make the necessary replacement? If yes, go to step  30. If no, go to next step.
  23. Inspect for a short to voltage in the glow plug relay signal circuit and repair as necessary. Did you find the improper condition? If yes, go to step  30. If no, go to step  27.
  24. Inspect for a short to voltage in the glow plug control circuit and repair as necessary. Did you find the improper condition? If yes, go to step  30. If no, go to step  29.
  25. Repair the open or poor connection on the battery voltage circuit. After repairs, go to step  30.
  26. Replace any glow plug that did not illuminate the test lamp. After repairs, go to step  30.
  27. Inspect for an open or poor connection in the glow plug harness. Did you find and correction the condition? If yes, go to step  30. If no, go to next step.
  28. Replace the glow plug relay. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. After repairs, go to step  30.
  29. Replace the ECM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. Reprogram ECM. See ENGINE CONTROL MODULE  under PROGRAMMING. After repairs, go to next step.
  30. Clear the DTCs with a scan tool. Turn OFF the ignition for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running DTC. Does the DTC run and pass? If yes, go to next step. If no, go to step  2.
  31. Observe the stored information, Capture Info with a scan tool. Does the scan tool display any DTCs that you have not diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
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