Ignition System: Testing and Inspection

Electronic Ignition (EI) System Diagnosis

Circuit Description

The ignition control module (ICM) has independent power and ground circuits. The circuits between the ICM and the powertrain control module (PCM) consists of the following circuits:

* The ignition control (IC) timing signal
* The IC timing control
* The low resolution engine speed signal
* The medium resolution engine signal
* The camshaft position signal
* The low reference

For a complete system description, Refer to Electronic Ignition (EI) System Description.

Test

Step 1 - Step 10:

Step 11 - Step 19: