LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Pontiac >> 2001 >> Firebird Formula, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics - 5.7L >> System Tests >> Malfunction Indicator Light Always On
April 5, 2026: LEMON Manuals is launched! Read the announcement.

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.
scientia non olet · About LEMON Manuals