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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 274 (Engine Controls - Self-Diagnostics - 2.2L) >> Diagnostic Tests >> DTC P0340: Camshaft Position Sensor Circuit >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2003 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform diagnostic system check - engine controls. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM. After performing diagnostic system check - engine controls, go to next step.
  2. Install scan tool. Start and operate engine at idle. Monitor the Camshaft Position (CMP) Active Counter parameter with the scan tool. Does the scan tool indicate the CMP active counter is incrementing? If yes, go to next step. If no, go to step  4.
  3. Observe the Freeze Frame/Failure Records for this DTC. Turn ignition off for 30 seconds. Start engine. Operate the 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 next step. If no, go to DIAGNOSTIC AIDS .
  4. Turn ignition off. Disconnect the ICM electrical connector. Connect a jumper wire from each terminal, except the CMP sensor signal circuit, in the ICM harness connector to the corresponding terminal at the ICM with Connector Test Adaptor Kit (J-35616-A). Measure the DC duty cycle between the CMP sensor signal circuit at the ICM and a good ground. Start engine. Is the duty cycle 45-55 percent? If yes, go to step  6. If no, go to next step.
  5. Turn ignition off. Remove the jumper wires from the ICM. Remove the ICM from the Ignition Coil Cassette. Remove the interconnect from between the coil cassette and the ICM. Inspect the interconnect for a poor connection at the coil cassette or at ICM. Did you find and correct the condition? If yes, go to step  11. If no, go to step  7.
  6. Test CMP sensor signal circuit for an open, high resistance, short to ground or short to voltage. Did you find and correct the condition? If yes, go to step  11. If no, go to step  8.
  7. Test for an intermittent and for a poor connection at the ICM. Did you find and correct the condition? If yes, go to step  11. If no, go to step  9.
  8. Test for an intermittent and for a poor connection at the ECM. Did you find and correct the condition? If yes, go to step  11. If no, go to step  10.
  9. Replace ICM. After replacing ICM, go to step  11.
  10. Turn ignition off. Replace ECM. Perform ECM relearn procedure. See ELECTRONIC CONTROL MODULE REPROGRAMMING  under PROGRAMMING. After replacing ECM, go to next step.
  11. Using scan tool, clear DTCs. Turn ignition off for 30 seconds. Operate vehicle within the conditions for running the DTC. See CONDITIONS FOR RUNNING DTC . You may also operate vehicle within the conditions 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.
  12. With a scan tool, observe the stored information, Capture Info. 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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