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Home >> Chevrolet >> 2001 >> Camaro Base, 2D Convertible, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 40 (Engine Control System Self-Diagnostics - 5.7L) >> Diagnostic Tests >> DTC P0342: Camshaft Position Sensor Circuit - Low >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2002 Pontiac Firebird and 2002 Chevrolet Camaro. 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. Install a scan tool. Start the engine. Use a scan tool in order to monitor the CAM signal input, High to Low transition. Does the scan tool parameter increment? If yes, go to next step. If no, go to step  4.
  3. Observe the Freeze Frame/Failure Records data for this DTC. Turn OFF the ignition for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running DTC. Attempt to duplicate the Freeze Frame/Failure Records data that you observed. Does the DTC fail this ignition cycle? If yes, go to next step. If no, see DIAGNOSTIC AIDS .
  4. Disconnect PCM connector C-1. Remove the CMP signal wire pin from the PCM harness connector. Reconnect the PCM connector with the signal pin removed. Start the engine. Measure the duty cycle from the CMP signal pin at the PCM connector with the Digital Multimeter (DMM). Does the DMM display a duty cycle of 45-55%? If yes, go to step  17. If no, go to next step.
  5. Turn OFF the ignition. Disconnect the PCM connector C-1 and reinstall the CMP signal pin to the harness connector. Reconnect the PCM connector. Remove the intake manifold in order to gain access to the camshaft position sensor. Disconnect the camshaft position sensor electrical connector. Turn ON the ignition, with the engine OFF. Measure the voltage from the camshaft position sensor 12-volt reference circuit to the battery ground with the DMM. Does the DMM display battery voltage? If yes, go to next step. If no, go to step  8.
  6. Use the DMM in order to measure the voltage from the CMP sensor 12-volt reference circuit to the CMP sensor low reference circuit. Does the DMM display battery voltage? If yes, go to step  9. If no, go to next step.
  7. Test for an open in the CMP sensor low reference circuit. Did you find an open low reference circuit? If yes, go to step  13. If no, go to step  17.
  8. Test for an open or a short to ground in the CMP sensor 12-volt reference circuit. Did you find the circuit open or shorted to a ground? If yes, go to step  12. If no, go to step  17.
  9. Turn ON the ignition, with the engine OFF. Measure the voltage at the CMP sensor signal circuit to ground with the DMM. Is the voltage less than 1 V? If yes, go to next step. If no, go to step  14.
  10. Probe the CMP signal circuit with the test lamp connected to battery voltage. Does the test lamp illuminate? If yes, go to step  15. If no, go to next step.
  11. Turn OFF the ignition. Disconnect the PCM connector C1 located on the same side as the manufacturer's logo. Test the continuity of the CMP sensor signal circuit with the DMM. Is the resistance less than 2 ohms? If yes, go to step  18. If no, go to step  16.
  12. Repair the open or short to ground in the CMP sensor 12-volt reference circuit. After repairs, go to step  20.
  13. Repair the open in the CMP sensor low reference circuit. After repairs, go to step  20.
  14. Repair the short to voltage on the CMP sensor signal circuit. After repairs, go to step  20.
  15. Repair the short to ground in the CMP sensor signal circuit. After repairs, go to step  20.
  16. Repair the open in the CMP sensor signal circuit. After repairs, go to step  20.
  17. Inspect for poor connections at the PCM. If you find a poor connection, repair the connection as necessary. Did you find and correct the condition? If yes, go to step  20. If no, go to step  19.
  18. Replace the CMP position sensor. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. After repairs, go to step  20.
  19. Replace the PCM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. Reprogram PCM. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After repairs, go to next step.
  20. 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.
  21. 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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