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:

The engine control module (ECM) 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.

Inspect the spark plug wires for proper orientation.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Electrical Information Reference

Scan Tool Reference

Special Tools Required

1. With the ignition OFF, remove the fuel pump relay using the J 43244 .
2. Crank the engine and test for a spark on each cylinder spark plug wire using the J 26792 . Ground the companion cylinder spark plug wire of each cylinder when it is tested.

⇒	If a bright blue spark is present on all 6 of the cylinders, remove and inspect all of the spark plugs for proper torque, proper gap, wear, damage, and fouling. Refer to Spark Plug Replacement and Spark Plug Inspection. Replace the spark plugs if necessary.

⇒	If there is no spark on any of the cylinders, test the ignition voltage circuit of the ICM for an open/high resistance or short to ground, or test the ground circuit of the ICM for an open/high resistance, or a faulty ICM.

⇒	The wire circuit resistance should measure less than 3 ohms.

⇒	If spark is present on one or more of the cylinders, inspect and test the spark plug wires for arching, cuts, rubbing on other components, and proper resistance , refer to Spark Plug Wire Inspection or a faulty ICM.

⇒	If all tests are normal, then the system is operating correctly.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.