Monitored Components: Notes
There are several components that will affect exhaust emissions if they malfunction. If the PCM (1) detects that one of these components has malfunctioned, the Malfunction Indicator Lamp (MIL) will illuminate. While the engine is running, the PCM (1) Monitors the following components for normal operation:
- Air Injection Motor (2)
- Air Switchover Valve (3)
- Left Air Shutoff Valve (4)
- Accelerator Pedal Position Sensor (5)
- Fuel Injectors (6)
- Right Air Shutoff Valve (7)
- Manifold Absolute Pressure (MAP) Sensor (8)
- Mass Airflow (MAF) Sensor (10)
- Throttle Valve Actuator/Throttle Position Sensor (TPS) (11)
- Ignition Coils (12)
- Crankshaft Position Sensor (13)
- Left Catalytic Converter (14)
- Left Upstream Oxygen (02) Sensor (15)
- Left Downstream 02 Sensor (16)
- Right Upstream 02 Sensor (17)
- Right Catalytic Converter (18)
- Right Downstream 02 Sensor (19)
Some of the component monitors are checking for proper operation of the part. Electrically operated components now have input (rationality) and output (functionality) checks as well as continuity tests (opens/shorts). The PCM monitors components to ensure they are working within specification. This is done by watching for a Electronic Throttle Control/TPS indication of a greater or lesser throttle opening than Manifold Absolute Pressure (MAP) and engine rpm indicate.
Refer to the appropriate powertrain diagnostic procedure information for diagnostic procedures.
The following is a list of the monitored components:
- Catalyst Monitor
- Comprehensive Components
- Air Injection System/Catalyst startup heating
- Fuel Control (rich/lean)
- Oxygen Sensor Monitor
- Oxygen Sensor Heater Monitor
- Purge
- Misfire