Failure Management

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

• Volume Airflow Sensor
  
  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
  
  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).
• 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.