Single Board Engine Controller-II

The Single Board Engine Controller-II (SBEC-II) is a dual microprocessor that receives various signals from engine sensors and provides the necessary signals to control engine sub-systems. The SBEC-II has a voltage converter that converts battery voltage to regulated 5-volt or 8-volt outputs. The regulated 5-volt output is used to power Manifold Absolute Pressure (MAP) sensor, Throttle Position Sensor (TPS) and logic circuits. The regulated 8-volt output is used to power crankshaft position sensor and synchronization signal generator in distributor.

The ignition and fuel injection systems are controlled by the SBEC-II. Based on present engine operating conditions, the engine controller is programmed to provide a precise amount of fuel and the correct ignition timing to meet existing engine speed and load requirements.

The engine controller adjusts ignition timing based on inputs it receives from synchronization sensor generator, MAP sensor, coolant temperature sensor, throttle position sensor, vehicle speed sensor, transmission gear selection (automatic transmissions only), and brake switch.

The engine controller adjusts idle speed based on inputs it receives from throttle position sensor, vehicle speed sensor, transmission gear selection (automatic transmissions only), A/C clutch switch, and brake switch.

The engine controller also controls the speed (cruise) control system and alternator charge rate by controlling the alternator field.

NOTE: Components are grouped into 2 categories. The first category covers INPUT DEVICES, which control or produce voltage signals that are monitored by the SBEC-II. The second category covers OUTPUT SIGNALS, which are components controlled by the SBEC-II.