Diagnostic Procedures

1995 Chevrolet Cavalier LS, 2D Convertible, 2.2 4, StandardSECTION Diagnostic Procedures
  1. Perform On-Board Diagnostic (OBD) System Check. After performing OBD system check, go to next step.
  2. Start engine and allow it to idle. Install scan tool. If CMP RESYNC counter is incrementing, go to next step. If CMP RESYNC counter is not incrementing, go to step 4).
  3. Turn ignition off. Disconnect CMP sensor connector. Turn ignition on. If CMP RESYNC counter stopped incrementing, go to step 5). If CMP RESYNC counter did not stop incrementing, go to step 6).
  4. With engine running, carefully wiggle CMP sensor connector. If CMP RESYNC counter is incrementing, go to next step. If CMP RESYNC counter is not incrementing, go to step 9).
  5. Check for poor connection at CMP sensor connector. Repair as necessary. After repair is completed, perform OBD System Check. If connector is okay, go to step 7).
  6. Replace PCM. Program replacement PCM using required equipment. After repair is completed, perform OBD System Check.
  7. Replace CMP sensor. After repair is completed, perform OBD System Check.
  8. Repair connections at CMP electrical connector. After repair is completed, perform OBD System Check.
  9. Turn ignition on, with engine off. Using scan tool, review FREEZE FRAME data and note parameters. Start engine and operate vehicle within conditions required for setting this DTC, and as close to conditions recorded in FREEZE FRAME as possible. If CMP RESYNC counter is incrementing, go to step 3). If CMP RESYNC counter is not incrementing, go to DIAGNOSTIC AIDS.
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When to See a Mechanic

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

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