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HOMESERVICE MANUALSCHEVROLET2001CAVALIER LS, 2.4 TREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 36 (ENGINE CONTROLS SELF-DIAGNOSTICS - 2.4L)DIAGNOSTIC TESTSDTC P0340: CMP SENSOR CIRCUIT PERFORMANCEDIAGNOSTIC PROCEDURES
2001 Chevrolet Cavalier LS, 2.4 T

Diagnostic Procedures

2001 Chevrolet Cavalier LS, 2.4 TSECTION Diagnostic Procedures
WARNING: This page is about a different car, the 2002 Pontiac Sunfire and 2002 Chevrolet Cavalier. 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 idle engine. Use scan tool in order to monitor the CMP active counter. Does the scan tool indicate the CMP active counter is incrementing? If yes, go to next step. If no, go to  4 .
  3. Observe the Freeze Frame/Failure Records and data. Turn ignition off for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running the DTC or as close to the Freeze Frame/Failure Records data that you observe. See CONDITIONS FOR RUNNING DTC  . Does the DTC reset? If yes, go to next step. If no, go to DIAGNOSTIC AIDS  .
  4. Turn ignition off. Disconnect the CMP sensor connector. Turn ignition on, with engine off. Measure voltage on the CMP 12-volt reference circuit using the Digital Multimeter (DMM) connected to battery ground. Does the voltage measure about B+? If yes, go to step  6 . If no, go to next step.
  5. Turn ignition off. Disconnect the PCM connector C2. Test the 12-volt reference circuit of the CMP sensor for a short to ground or an open. Did you find and correct the condition? If yes, go to step  16 . If no, go to step  12 .
  6. Connect a test light to battery positive voltage. Touch the CMP sensor low reference circuit. Does the test light illuminate? If yes, go to step  8 . If no, go to next step.
  7. Turn ignition off. Disconnect PCM connector C2. Test the low reference circuit of the CMP sensor for an open. Did you find and correct the condition? If yes, go to step  16 . If no, go to step  12 .
  8. Start engine. Observe CMP active counter on scan tool. Connect a 5-amp fused jumper wire to battery positive voltage and momentarily touch the signal circuit 5 times for a duration of 1 second each. Does the CMP active counter change EACH time the signal circuit is touched? If yes, go to step  14 . If no, go to next step.
  9. Did the fuse in jumper wire open? If yes, go to step  11 . If no, go to next step.
  10. Test the signal circuit of the CMP sensor for a short to voltage or an open. Did you find and correct the condition? If yes, go to step  16 . If no, go to step  12 .
  11. Test the signal circuit of the CMP sensor for a short to ground. Did you find and correct the condition? If yes, go to step  16 . If no, go to next step.
  12. Inspect for poor connections at the PCM. Did you find and correct the condition? If yes, go to step  16 . If no, go to next step.
  13. Replace PCM. Perform PCM relearn procedure. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. Operate engine at idle for 5 minutes or until the MIL turns ON. Did the MIL illuminate? If yes, see DIAGNOSTIC AIDS  . If no, go to step  16 .
  14. Inspect for poor connections at the CMP sensor. Did you find and correct the condition? If yes, go to step  16 . If no, go to next step.
  15. Replace CMP sensor. When complete, go to next step.
  16. Clear the DTCs with a scan tool. Turn ignition off for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running the DTC. See CONDITIONS FOR RUNNING DTC  . Does the DTC run and pass? If yes, go to next step. If no, go to step  2 .
  17. Using scan tool, observe stored information and Capture Info. If scan tool displays any undiagnosed DTCs, diagnose affected DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  . If no other DTCs are displayed, system is okay.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.