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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. Observe the Freeze Frame/Failure Records data for this DTC. Turn OFF the ignition for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running DTC or as close to the Freeze Frame/Failure Records data that you observed. Does the DTC fail this ignition? If yes, go to next step. If no, see INTERMITTENT CONDITIONS  under SELF-DIAGNOSTIC SYSTEM.
  3. Are DTC P0335, DTC P0336, DTC P0340 or DTC P0341 set? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, go to next step.
  4. Inspect for a loose CMP sensor. If the sensor cannot be tightened, the sensor must be replaced. Does the CMP sensor move without being able to be tightened? If yes, go to step  7. If no, go to next step.
  5. Remove the CMP sensor. Inspect for a broken CMP sensor casing or a rattle inside when shaken. Does the CMP sensor show any signs of physical damage? If yes, go to step  7. If no, go to next step.
  6. Remove the front engine cover. Check for excessive camshaft end play. Inspect for front engine cover damage. Inspect for timing gear misalignment or damage. See appropriate article in ENGINES. Did you find and correct the condition? If yes, go to step  8. If no, diagnose by symptom. See appropriate article in ENGINES.
  7. Replace the CMP sensor. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. After repairs, go to next step.
  8. 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.
  9. 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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