Failure Management

When main sensor malfunctions are detected, ECM/PCM will enter fail-safe mode. Default values will be substituted in ECM/PCM calculations for faulty sensor as follows:

• Volume Airflow Sensor
  
  ECM/PCM will use engine speed (crankshaft position sensor) and Throttle Position (TP) sensor signals to determine injector drive time and basic ignition timing. Idle Air Control (IAC) motor remains in a fixed position.
• Intake Air Temperature (IAT) Sensor
  
  Sets at a default of 77°F (25°C).
• Throttle Position (TP) Sensor
  
  Fuel injection amount will not increase during acceleration due to unreliable TP sensor signal.
• Engine Coolant Temperature (ECT) Sensor
  
  Sets at a default of 176°F (80°C).
• Camshaft Position (CMP) Sensor
  
  ECM/PCM will command injectors to inject fuel into cylinders in normal 1-3-4-2 order, but may not be synchronized with camshaft timing.
• Barometric Pressure (BARO) Sensor
  
  Sets at a default of 30 in. Hg (101 kPa).
• Knock Sensor
  
  Switches ignition timing from high octane to fixed at low octane.
• Heated Oxygen Sensor (HO2S) Front
  
  Closed-loop fuel control is not allowed.
• Heated Oxygen Sensor (HO2S) Rear
  
  Allows closed-loop fuel control using front HO2S signals.
• Generator FR Terminal
  
  Generator output suppression control of electrical load is not performed.
• Communication Line With Transaxle Control Module (TCM)
  
  Ignition timing retard control is inoperative when transaxle speeds change.
• Misfire Detection
  
  Fuel supply is stopped to cylinder if misfiring will damage catalytic converter.