Ignition Control (IC) System

The Ignition Control (IC) system consists of the following:
^ Camshaft Position Sensor
^ Ignition Coil
^ Ignition Coil Module
^ Powertrain Control Module.

These circuits perform the following functions:
^ Low resolution signal reference.
- This provides the PCM with reference signals, firing order, and camshaft position information. If the low resolution signal circuit becomes open or grounded, the engine will not run because the PCM will not operate the ignition coil module, fuel pump, or the fuel injectors.
- A DTC P1371 will set if the PCM receives high resolution signal references without the low resolution signals.
^ High resolution signal reference.
- This provides the PCM with detailed reference signals and crankshaft position information.
- If this circuit becomes opens or grounded a DTC P0372 will set and the engine will still run.
- When there is a malfunction with the high resolution circuit, excessive crank times will be experienced.
^ System ground.
- This circuit is grounded at the PCM and provides ground for the distributor to generate low and high resolution signal reference signals.
- If this circuit becomes open, the engine will not run since there will be no reference information.
^ Ignition Control (IC).
- This circuit controls the ignition coil ON and OFF time. It signals the ignition coil module to begin primary coil dwell current when the IC is high. The ignition coil module shuts OFF ignition coil current when the signal goes low.
- If this circuit becomes open, shorted to voltage, or grounded, the engine will not start and a DTC P1351 or P1361 will set.