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. With engine running, wiggle PCM connectors, ICM connectors, CKP sensor connector and related wiring. If engine stumbles, go to step 5). If engine does not stumble, go to next step.
  3. Install scan tool. Select med. resolution parameter on scan tool while operating any non-engine related system. accessories on vehicle. If MED. RESOLUTION RESYNC CNTR on scan tool resyncs while operating accessories, go to step 5). If MED. RESOLUTION RESYNC CNTR on scan tool does not resync while operating accessories, go to next step 4).
  4. Replace CKP sensor. If condition is corrected, perform OBD System Check. If condition is not corrected, go to step 6).
  5. Repair faulty circuit that created problem. After repair is completed, perform OBD System Check.
  6. Replace PCM. Program replacement PCM using required equipment. After repair is completed, perform OBD System Check.
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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.