Ignition System (PHEV): Troubleshooting

Symptom	Suspect area	Remedy
Vehicle indicates Ready in dash, but engine will not run when requested by the HPCU (HEV module).	Ignition coil	Inspect ignition coil, or replace as required
	Spark plugs	Inspect spark plugs, or replace as required
	Ignition wiring disconnected or broken	Repair wiring, or replace as required
Rough idle	Ignition wiring	Repair wiring, or replace as required
Rough idle	Ignition coil	Inspect ignition coil, or replace as required
Engine hesitates/poor acceleration	Spark plugs	Inspect spark plugs/replace as required
Engine hesitates/poor acceleration	Ignition wiring	Repair wiring, or replace as required
Poor mileage	Spark plugs	Inspect spark plugs/replace as required