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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 P0013: Camshaft Position "B" Actuator Circuit (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. Start engine. Allow engine to reach operating temperature. Increase engine speed to 1500 RPM. Using scan tool, command the cam phaser to 90 percent. Does the Cam Phase Actual parameter match the Cam Phase Angle Desired parameter? 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. Start engine. Operate vehicle within the Conditions For Running the 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 next step. If no, problem is intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES - 4.2L BRAVADA, ENVOY, ENVOY XL, TRAILBLAZER & TRAILBLAZER EXT article.
  4. Turn ignition off. Disconnect the camshaft position actuator solenoid connector. Turn ignition on, with engine off. With a DVOM, measure voltage between the camshaft position actuator solenoid high control circuit and a good ground. Does the DVOM display voltage at battery voltage? If yes, go to next step. If no, go to step  7.
  5. Connect a test light between the camshaft position actuator solenoid high control circuit and ground. Does the test light illuminate? If yes, go to step  9. If no, go to next step.
  6. Connect a test light between the low reference circuit and battery positive. Does the test light illuminate? If yes, go to step  11. If no, go to step  8.
  7. Test the camshaft position actuator solenoid high control circuit for an open or short to ground. Did you find and correct the condition? If yes, go to step  14. If no, go to step  10.
  8. Test the low reference circuit for an open. Did you find and correct the condition? If yes, go to step  14. If no, go to step  10.
  9. Test the camshaft position actuator solenoid high control circuit for a short to voltage. Did you find and correct the condition? If yes, go to step  14. If no, go to step  12.
  10. Inspect for poor connections at the harness connector of the PCM. Did you find and correct the condition? If yes, go to step  14. If no, go to step  12.
  11. Inspect for poor connections at the harness connector of the camshaft position actuator solenoid. Did you find and correct the condition? If yes, go to step  14. If no, go to step  13.
  12. 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 step  14.
  13. Replace camshaft position actuator solenoid. See REMOVAL & INSTALLATION - BRAVADA, ENVOY, ENVOY XL, TRAILBLAZER & TRAILBLAZER EXT article. After repairs, go to next step.
  14. Clear the DTCs with scan tool. Turn ignition off for 30 seconds. Start engine. Operate vehicle within the Conditions For Running DTC. See CONDITIONS FOR RUNNING DTC . Does the DTC run and pass? If yes, go to next step. If no, go to step  2.
  15. 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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