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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 370 (Engine Control System - Self-Diagnostics - 4.2L) >> Diagnostic Tests >> DTC P0014: Camshaft Position "B" Timing Over Advanced Or System Performance (Bank 1) >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 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 scan tool. Start and idle the engine for 2 minutes. Increase engine speed to 1500 RPM. With scan tool, command the cam phase solenoid from zero 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 ignition off for 30 seconds. Operate the vehicle within the Conditions For Running DTC or as close the Freeze Frame/Failure Records data that you observe. See CONDITIONS FOR RUNNING DTC . Does the DTC fail this ignition cycle? If yes, go to next step. If no, problem is intermittent.
  4. Let engine idle. Does the engine run rough or stall? If yes, go to step  9. If no, go to next step.
  5. Turn ignition off. Let vehicle sit for one minute. Check engine oil level. Is 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 gauge. Start engine. Increase engine speed to 1400 RPM. Observe engine oil pressure. Does the oil pressure gauge 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 1500 RPM. With scan tool, command the cam phase solenoid from zero 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 ignition off. Disconnect the camshaft position actuator solenoid connector. With a DVOM, 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  20.
    9. CAUTION: Avoid contact with moving parts and hot surfaces while working around a running engine in order to prevent physical injury.
  9. Turn ignition off. Disconnect the camshaft position actuator solenoid connector. Probe the camshaft position actuator solenoid high control circuit with a test light connected to good ground. Start engine. With scan tool, command the cam phase solenoid between 0-50 percent. Does the test light turn ON and OFF? If yes, go to next step. If no, go to step  15.
  10. Turn ignition off. 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  20. 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  18.
  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  22.

  13. Disconnect the PCM. With a DVOM measure the resistance on the camshaft position actuator high control circuit. Does the resistance measure more than 5 ohms? If yes, go to step  16. If no, go to next step.
  14. Measure the resistance on the low reference circuit with a DVOM. Does the resistance measure more than 5 ohms? If yes, go to step  17. 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  22. If no, go to step  18.
  16. Repair high resistance on the camshaft position actuator high control circuit. After repairs, go to step  22.
  17. Repair high resistance on the camshaft position actuator low reference circuit. After repairs, go to step  22.
  18. Test for an intermittent and for a poor connection at the camshaft position actuator solenoid valve assembly. Did you find and correct the condition? If yes, go to step  22. If no, go to step  20.
  19. Test for an intermittent and for a poor connection at the PCM. Did you repair the circuit? If yes, go to step  22. If no, go to step  21.
  20. Replace camshaft position actuator solenoid. See REMOVAL & INSTALLATION - BRAVADA, ENVOY, ENVOY XL, TRAILBLAZER & TRAILBLAZER EXT article. After repairs, go to step  22.
  21. Replace PCM. See REMOVAL & INSTALLATION - BRAVADA, ENVOY, ENVOY XL, TRAILBLAZER & TRAILBLAZER EXT article. Reprogram PCM. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After repairs, go to next step.
  22. Clear the DTCs with scan tool. Turn ignition off for 30 seconds. Start engine. Operate vehicle within the Conditions For Running the DTC. See 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? If yes, go to step  2. If no, go to next step.
  23. Observe the stored information, Capture Info with scan tool. Does 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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