On-Board Diagnostics: Notes

The Powertrain Control Module (PCM) diagnoses any troubles which may occur in the engine control system when the ignition switch is in the ON position with the engine running. The PCM indicates a malfunction by illuminating the Malfunction Indicator Light (MIL) when a fault occurs in any of the following systems:

• Heated Oxygen Sensor 1 (HO2S 1)
• Heated Oxygen Sensor 2 (HO2S 2)
• Engine Coolant Temperature (ECT) Sensor
• Throttle Position (TP) Sensor (Including CTP Switch)
• Vehicle Speed Sensor (VSS)
• Intake Air Temperature (IAT) Sensor
• Mass Air Flow (MAF) Sensor
• Camshaft Position (CMP) Sensor
• Crankshaft Position (CKP) Sensor
• Knock Sensor (KS) System
• Evaporative Emission (EVAP) Control System
• Idle Air Control (IAC) System
• CMP Actuator Solenoid System
• Rocker Arm Oil Control system
• Misfire Detection
• Fuel-Trim
• Catalyst Monitor
• Central Processing Unit (CPU) Of The PCM

When PCM detects a malfunction in one of the above areas, PCM will illuminate or flash the MIL to notify driver of the occurrence of a fault. PCM will store a DTC when PCM illuminates the MIL. PCM will turn OFF the MIL after 3 consecutive ignition cycles without the malfunction occurring. DTC will remain stored in the PCM memory after the MIL is OFF.