The ignition coil harness provides the 12 volt power to the ignition coils and igniter module, transmits the command signals from the ECM to the igniter module, and the ground circuit from the coils to the igniter module. See Figure
6. Harness Connector
Ignition Coil Harness
Removal of Ignition Coil Harness
Remove the ignition coil harness as follows:
Remove the two Phillips screws holding the coil cover in the rocker cover. Remove the coil cover.
Pull the connectors of the ignition coil harness from the four ignition coils.
Pull the connectors from the igniter module.
Disconnect the ignition coil harness from the 12 volt power supply.
Disconnect the ignition coil harness from the ECM.
Unscrew the harness clips from the rocker cover and the cylinder block.