2001 Pontiac Firebird Formula, AutomaticFACTORY OEM SERVICE PROCEDURE

Malfunction Indicator Light Always On

  1. If powertrain diagnostic system check was performed, go to next step. If powertrain diagnostic system check was not performed, go to POWERTRAIN DIAGNOSTIC SYSTEM CHECK  under DIAGNOSTIC SYSTEM CHECKS.
  2. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. PCM is located on right rear of engine compartment. Turn ignition on. Observe Malfunction Indicator Light (MIL). If MIL illuminates, go to next step. If MIL does not illuminate, go to step  5.
  3. Turn ignition off. Remove the Instrument Panel Cluster (IPC). See REMOVAL & INSTALLATION in appropriate ANALOG INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT. Using DVOM, measure resistance between ground and IPC connector terminal A8 (Brown/White wire). See Figure. If resistance is more than 5 ohms, go to next step. If resistance is 5 ohms or less, repair short to ground in Brown/White wire. After repairs, go to step  6
  4. Replace IPC. After repairs, go to step  6.
  5. Replace PCM. See REMOVAL, OVERHAUL & INSTALLATION - CARS article. After repairs, go to next step.
  6. Recheck operation on MIL. If MIL operates properly, repair is complete. If MIL does not operate properly, go to step  2.
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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.