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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 51 (Engine Control System - Self-Diagnostics - 4.2L) >> Diagnostic Tests >> DTC P0341: Camshaft Position Sensor Circuit Performance >> Diagnostic Procedures

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. Turn ON the ignition, with the engine OFF. Connect a scan tool. Are any other DTCs set? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS  . If no, go to next step.
  3. Start the engine. Allow the engine to idle. Observe the CMP Resync Counter with the scan tool. Is the CMP Resync Counter incrementing? If yes, go to next step. If no, see DIAGNOSTIC AIDS  .
  4. Turn OFF the ignition. Disconnect the CMP sensor electrical connector. Start the engine. Observe CMP Resync on the scan tool. Did the CMP Resync Counter stop incrementing? If yes, go to next step. If no, go to step  6 .
  5. Turn OFF the engine. With the CMP connector still disconnected, connect a Digital Multimeter (DMM) set to the DC HZ scale from the CMP signal circuit (PCM side) to ground. Start and idle the engine. Does the DMM display a Hertz reading above 0 Hz? If yes, go to next step. If no, go to step  7 .
  6. Inspect the CMP sensor harness for incorrect routing at the following locations, or shorted to another circuit that generates frequency:
    • Secondary ignition wires or coils.
    • Solenoids.
    • Relays.
    • Motors.

    Did you locate and correct the condition? If yes, go to step  11 . If no, go to step  9 .

  7. Turn OFF the ignition. Check for a faulty electrical connection at the CMP sensor electrical connector. Repair the electrical connector as necessary. Did you find and correct the condition? If yes, go to step  11 . If no, go to next step.
  8. Replace the camshaft position (CMP) sensor. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. After repairs, go to step  11 .
  9. Disconnect the PCM electrical connector. Check the PCM terminals for a faulty electrical connection. Repair the terminals as necessary. Did you find and correct the condition? If problem was found, go to step  11 . If problem was not found, go to next step.
  10. Replace the PCM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. Reprogram PCM. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After repairs, go to next step.
  11. 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 .
  12. 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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