Ignition System: Testing and Inspection

Electronic Ignition (EI) System Diagnosis

Circuit Description

There are 3 dual-tower ignition coils that are part of the ignition control module (ICM). The ICM contains coil driver circuits that command the coils to operate. The ICM has the following circuits:

* An ignition voltage circuit
* A ground
* An ignition control (IC) 1 control circuit for the 1-4 ignition coil
* An IC 2 control circuit for the 2-5 ignition coil
* An IC 3 control circuit for the 3-6 ignition coil
* A low reference circuit

The powertrain control module (PCM) controls each dual-tower ignition coil by transmitting timing pulses on the ignition coil control circuit to the ICM for the proper coil to enable a spark event.

Test

Step 1 - Step 8:

Step 9 - Step 22:

Step 23: