Engine Start-Up

This is an OPEN LOOP mode.

When the starter motor is engaged, the PCM receives input from:

- Battery voltage

- Crankshaft position (CKP) sensor

- Engine coolant temperature (ECT) sensor

- Intake air temperature (IAT) sensor

- Throttle position sensor (TPS)

- Camshaft position (CMP) sensor

- Starter relay

Based on these inputs the PCM will:

- Monitor crankshaft position sensor. If no signal is received within 3 seconds, the PCM will shut down the fuel injection system.

- Supply the injectors with a ground path, firing all injectors until the PCM determines crankshaft position.

- Determine proper ignition timing.