Late Models

Computerized Engine Controls:

The engine systems in this vehicle are controlled by a Single Board Engine Controller II (SBEC II). 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 II 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 II to function correctly (See list of SBEC II inputs and outputs below). In addition to these sensors, various switches and relays are used to carry out commands or outputs from the SBEC II.

The SBEC II 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.

SBEC II INPUTS

- Battery Voltage
- Manifold Absolute Pressure (MAP) Sensor
- Coolant Temperature Sensor
- Charge Temperature Sensor
- Heated Oxygen (O2) Sensor
- Crankshaft Position Sensor
- Camshaft Reference Sensor
- Throttle Position Sensor (TPS)
- A/C Select Signal
- A/C Request Signal
- Neutral Safety Switch (gear selection-auto trans.)
- Vehicle Distance Sensor
- Cruise Control System Controls
- Brake Switch


SBEC II OUTPUTS

- Electric Fuel Pump Relay
- Auto Shutdown Relay
- A/C Clutch Relay
- Fuel Injectors
- Automatic Idle Speed Motor
- Electric EGR Transducer (EET)
- Ignition Coils
- Cruise Control System
- Radiator Fan Relay
- Check Engine Lamp
- Tachometer