Failure Management
WARNING: This page is about a different variant/trim than selected.
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.