Fail-Safe Mode

If any malfunctions are detected in Mass Airflow (MAF), Engine Coolant Temperature (ECT), Throttle Position (TP), Traction Control System (TCS) or Powertrain Control Module (PCM) due to an open or short circuit, PCM will enter a fail-safe mode. Driveability will be poor and the MIL will be illuminated. Preprogrammed values will be used for engine operating conditions when PCM goes into fail-safe mode. See FAIL-SAFE OPERATING CONDITIONS  table. Refer to all diagnostic tests that apply for description and testing of circuit affected.

When a failure is detected in the Central Processing Unit (CPU) of PCM, MIL will be illuminated. When PCM is in fail-safe, fuel injection, ignition timing, fuel pump operation, IACV-AAC valve and cooling fan operation will be limited. DTC and other PCM information may not be accessible.