Engine Start-Up

This is an Open Loop mode. The following actions occur when the starter motor is engaged.

The engine controller receives inputs from:

^ Battery voltage

^ Coolant temperature sensor

^ Crankshaft position sensor (CPS)

^ Charge Air Temperature sensor

^ Manifold absolute pressure (MAP) sensor

^ Throttle position sensor (TPS)

^ Starter motor relay

^ Sync signal (in the distributor)

The engine controller monitors the crankshaft position sensor (CPS). If the engine controller does not receive a CPS signal within 3 seconds of cranking the engine, it will shut down the fuel injection system.

The fuel pump is activated by the engine controller through the fuel pump relay.

Voltage is applied to the fuel injectors with the engine controller. This controls the injection sequence and injector pulse width by turning the ground circuit to each individual injector on and off.

The engine controller determines the proper ignition timing according to input received from the crankshaft position sensor (CPS).