Engine Start-Up Mode

WARNING: This page is about a different car, the 2017 Dodge Charger. However, it is still accessible from the selected car via links, so may be relevant.

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

The PCM receives inputs from:

Direct Battery voltage
Accelerator Pedal Position Sensor (APPS)
Engine Coolant Temperature (ECT) sensor
Crankshaft Position (CKP) sensor
Intake Manifold Air Temperature (IMAT) sensor
Manifold absolute pressure (MAP) sensor
Throttle position sensors (TPS)
Camshaft Position Sensor (CPS) signal

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

The fuel pump is activated by the PCM through the fuel pump relay located in the front Power Distribution Center (PDC).

Voltage is applied to the fuel injectors with the ASD relay via the PCM. The PCM will then control the injection sequence and injector pulse width by actuating ground circuit to each individual injector on and off.

The PCM determines the proper ignition timing according to input received from the crankshaft position sensor.