General System Description

The engine controller is a pre-programmed digital, microprocessor digital computer. The engine controller is located in the engine compartment, behind the battery and under the left front fender.

The engine controller contains a voltage converter, which converts battery voltage to a regulated 8.0 volts. This is used to power the engine speed sensor. The engine controller provides a 5.0 volt supply for the throttle position sensor (TPS). The TPS is not used on trucks equipped with a manual transmission.

Various sensors, switches and relays provide the input necessary for operation of the engine controller.


SBEC INPUTS SBEC OUTPUTS

- A/C Control Switch - A/C Clutch Relay
- Auto Shutdown (ASD) Sense - Alternator Field
- Battery Voltage - Air Intake Heater Relays
- Brake Light Switch - Auto Shutdown Relay (ASD)
- Charge Air Temperature Sensor - Check Engine Lamp
- Coolant Temperature Sensor (A/T) - Overdrive Indicator Lamp
- Engine Speed Sensor - Overdrive Solenoid
- Ignition Sense - SCI Transmit
- Park/Neutral Switch - Speed Control
- Overdrive/Override Switch - Tachometer
- Power Ground - Wait-To-Start Lamp
- Sensor Return - Water-In-Fuel Lamp
- SCI Receive
- Signal Ground
- Speed Control switch
- Transmission Thermo-Switch
- Throttle Position Sensor (TPS)
- Vehicle Distance (Speed) Sensor
- Water-In-Fuel Sensor