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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 P0341: Camshaft Position Sensor "A" Circuit Range/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. Turn ignition on, with engine off. Connect scan tool. Are any other DTCs set? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, go to next step.
  3. Start engine. Observe the CMP Resync Counter with scan tool. Is the CMP Resync Counter incrementing? If yes, go to next step. If no, see DIAGNOSTIC AIDS .
  4. Turn ignition off. Disconnect the CMP sensor electrical connector. Start the engine. Observe CMP Resync on scan tool. Did the CMP Resync Counter stop incrementing? If yes, go to next step. If no, go to step  6.
  5. Turn engine off. With the CMP sensor connector still disconnected, connect a DVOM set to the DC HZ scale from the CMP sensor signal circuit (PCM side) to ground. Start and idle the engine. Does the DVOM display a Hertz reading more than zero Hz? If yes, go to next step. If no, go to step  7.
  6. Visually and physically inspect all circuits going to the CMP sensor for the following: Being routed too close to secondary ignition wires or components. Being routed too close to aftermarket add-on electrical equipment. Being routed too close to solenoids, relays, and motors. If you find incorrect routing, correct the harness routing. Did you find and correct the condition? Inspect the CMP sensor harness for incorrect routing or shorted to another circuit that generates frequency: Did you locate and correct the condition? If yes, go to step  11. If no, go to step  9.
  7. Turn ignition off. Check for a faulty electrical connection at the CMP sensor electrical connector. Repair 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 Camshaft Position (CMP) sensor. See REMOVAL & INSTALLATION - BRAVADA, ENVOY, ENVOY XL, TRAILBLAZER & TRAILBLAZER EXT article. After repairs, go to step  11.
  9. Disconnect the PCM electrical connector. Check the PCM terminals for a faulty electrical connection. Repair 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 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.
  11. 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.
  12. 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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