Ignition Coil: Description and Operation

CIRCUIT OPERATION
There are two ignition coil packs used on this vehicle. The ignition coil pack used to fire spark plugs 1, 2, 3, 6, 8, and 9 consists of three separate coils molded together. The coil pack used to fire spark plugs 4, 5, 7, and 10 consists of two coils molded together.

Power for the ignition coils is supplied on circuit A142 when the contacts in the Automatic Shut Down (ASD) relay are CLOSED. Battery voltage for the contact side is supplied on circuit A14. This circuit is HOT at all times and protected by a fusible link located near the auxiliary jumper post on the left toe box.

Power for the coil side of the ASD relay is supplied on circuit F12. This circuit is HOT when the ignition switch is in the START or RUN position. Ground for the coil side of the relay is controlled by the Powertrain Control Module (PCM) on circuit K51.

When the PCM supplies a ground path for circuit K51 the contacts in the ASD relay CLOSE connecting circuits A14 and A142. Circuit A142 powers the ignition coils and is double crimped at the ASD relay to supply an ASD relay energized input to the PCM.

Ground for the ignition coils is controlled by the PCM at the BLACK connector. Circuit K19 is the ground circuit for coil driver #1 and connects to cavity 7 of the PCM.

Circuit K17 is the ground circuit for coil driver #2 and connects to cavity 9 of the PCM.

Circuit K18 is the ground circuit for coil driver #3 and connects to cavity 3 of the PCM.

Circuit K32 is the ground circuit for coil driver #4 and connects to cavity 1 of the PCM.

Circuit K43 is the ground circuit for coil driver #5 and connects to cavity 5 of the PCM.