Electronic Control System

2001 Chevrolet Cavalier LS, 2.4 TSECTION Electronic Control System
WARNING: This page is about a different variant/trim than selected.

PCM continuously monitors all electrical circuits. If PCM detects circuit problems or out-of-range sensors, DTCs are recorded. If problem continues for a predetermined time, MIL will illuminate.

If MIL remains illuminated, DTCs are currently being detected. If MIL is off, but PCM has detected a circuit or sensor problem, DTCs are stored in PCM memory.

Stored DTCs may be retrieved from PCM memory using scan tool. DTCs cannot be retrieved by grounding 16-pin Data Link Connector (DLC).

NOTE: Faulty engine sensors and actuators may cause transaxle-related DTCs or driveability problems. Engine faults and related DTCs must be diagnosed and repaired before transaxle-related DTCs are repaired. For additional information on diagnosing and repairing engine-related PCM DTCs, see appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
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:

  • 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.