Circuit Description

PCM control dwell and spark timing during all engine running conditions. The Electronic Ignition (EI) module charges the coil pack when the PCM supplies 5 volts to the 2/3 coil. The coil will then discharge or fire through its secondary coil towers whenever the voltage has been turned off by the PCM.

During long cranking, PCM pulses the Ignition Control (IC) circuit high and low. The PCM monitors the diagnostic feedback circuit to diagnose circuit faults. DTC will set if there is an open, short to voltage or short to ground in IC 2 and 3 circuits or if there is a short to voltage in IC 2 and 3 circuits when engine is in cranking mode. IC circuits No. 2 and No. 3 are checked continuously whenever crankshaft position sensor pulses are received by the PCM during cranking mode only.