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Diagnostic Procedures

WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. 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. Connect a scan tool. Start and idle the engine for 2 minutes. Increase engine RPM to 1,500. With a scan tool, command the cam phase solenoid from 0 percent to 100 percent. Does the Cam Phase Angle Actual remain close to the Cam Phase Angle Desired at all commanded positions? If yes, go to next step. If no, go to step  4 .
  3. Observe the Freeze Frame/Failure Records data for this DTC. Turn OFF the ignition for 30 seconds. Operate the vehicle within the Conditions for Running DTC or as close the Freeze Frame/Failure Records data that you observe. Does the DTC fail this ignition cycle? If yes, go to next step. If no, see DIAGNOSTIC AIDS  .
  4. Let the engine idle. Does the engine run rough or stall? If yes, go to step  9 . If no, go to next step.
  5. Turn OFF the ignition. Let the vehicle sit for 1 minute. Check the engine oil level. Is the engine oil level within operating range? If yes, go to next step. If no, add oil to bring oil level to correct operating range.
  6. Install an oil pressure gage. Start the engine. Increase the engine RPM to 1,400 RPM. Observe the engine oil pressure. Does the oil pressure gage indicate engine oil pressure less than 28 psi? If yes, diagnose low oil pressure. See appropriate article in ENGINES. If no, go to next step.
  7. Increase engine RPM to 1,500 RPM. With a scan tool, command the cam phase solenoid from 0 percent to 100 percent. Does the Cam Phase Angle Actual increment at all? If yes, go to next step. If no, go to step  10 .
  8. Turn OFF the ignition. Disconnect the camshaft position actuator solenoid connector. With a Digital Multimeter (DMM), measure the resistance of the camshaft position actuator solenoid valve assembly. Does the resistance measure 8-12 ohms? If yes, go to step  13 . If no, go to step  19 .
    9. CAUTION: Avoid contact with moving parts and hot surfaces while working around a running engine in order to prevent physical injury.
  9. Turn OFF the ignition. Disconnect the camshaft position actuator solenoid connector. Probe the camshaft position actuator solenoid high control circuit with a test lamp connected to good ground. Start the engine. With a scan tool, command the cam phase solenoid between 0 percent and 50 percent. Does the test lamp turn ON and OFF? If yes, go to next step. If no, go to step  15 .
  10. Turn OFF the ignition. Remove the camshaft position solenoid valve assembly from the engine block. Inspect the camshaft position actuator solenoid valve assembly for the following:
    • Torn screens.
    • Debris on the screens.
    • Debris clogging the oil ports.
    • Missing screens.
    • Oil seepage at the solenoid connector pins.

    Did you find a problem? If yes, go to step  19 . If no, go to next step.

  11. Connect a jumper wire between battery ground and the camshaft position actuator low control at the solenoid. Connect a fused jumper wire between battery voltage and the camshaft position actuator high control at the solenoid. Momentarily touch the fused jumper to the battery voltage. Observe the spool valve inside the camshaft position actuator. Does the spool valve move from fully closed to fully opened? If yes, go to next step. If no, go to step  16 .
  12. Inspect for the following conditions:
    • Excessive timing chain play.
    • Excessive camshaft end play.
    • Excessive crankshaft end play.
    • Proper installation of the camshaft position actuator assembly.

    See appropriate article in ENGINES. Repair as necessary. After repairs, go to step  21 .

  13. Disconnect the PCM. With a DMM measure the resistance on the camshaft position actuator high control circuit. Does the resistance measure more than 5 ohms? If yes, go to step  18 . If no, go to next step.
  14. Measure the resistance on the low reference circuit with a DMM. Does the resistance measure more than 5 ohms? If yes, go to step  18 . If no, see appropriate article in ENGINES.
  15. Test the camshaft position actuator high control circuit for a short to voltage. Did you find and correct the condition? If yes, go to step  21 . If no, go to step  17 .
  16. Inspect for poor connections at the harness connector of the camshaft position actuator solenoid valve assembly. Did you find and correct the condition? If yes, go to step  21 . If no, go to step  19 .
  17. Inspect for poor connections at the harness connector of the PCM. Did you find and correct the condition? If yes, go to step  21 . If no, go to step  20 .
  18. Repair the circuit. Did you repair the circuit? If yes, go to step  21 .
  19. Replace the camshaft position actuator solenoid. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. After repairs, go to step  21 .
  20. Replace the PCM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. Reprogram PCM. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After repairs, go to next step.
  21. 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 .
  22. 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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