General System Description

Computerized Engine Controls:

The engine systems in this vehicle are controlled by a Single Board Engine Controller (SBEC). This controller provides precise air/fuel mixture control for all driving conditions, and regulates ignition timing, emission control devices, cooling fan, charging system, and idle speed. The SBEC is a digital pre-programmed computer that has the ability to update and revise its programming to meet changing operating conditions.

Various sensors provide necessary input for the SBEC to function correctly (See list of SBEC inputs and outputs below). In addition to these sensors, various switches and relays are used to carry out commands or outputs from the SBEC.

The SBEC tests many of its own input and output circuits. If a fault is found in any major system, this information is either stored in memory or displayed as a light on the instrument panel. If a fault exists, the fault information can be displayed to a technician through the instrument panel CHECK ENGINE lamp or a suitable diagnostic scan tool.

INPUTS -OUTPUTS

- Battery Voltage -Electric Fuel Pump Relay
- Brake Switch -Auto Shutdown Relay
- Manifold Absolute Pressure (MAP) Sensor -A/C Clutch Relay
- Coolant Temperature Sensor -Fuel Injectors
- Charge Temperature Sensor -AIS Motor
- Heated Oxygen (O2) Sensor -[1][2]Electric EGR Transducer
- Crankshaft Position Sensor -Ignition Coils
- Camshaft Reference Sensor -Cruise Control System
- Throttle Position Sensor (TPS) -Radiator Fan Relay
- A/C Select Signal -Check Engine Lamp
- A/C Request Signal -Tachometer
- Neutral Safety Switch
- Vehicle Distance Sensor
- Cruise Control System Controls