Ignition System Symptom Diagnosis

PROBLEM SYMPTOM CHART

Condition	Possible Cause	Action
Engine cranks, but will not start or hard to start (No spark)	Blown fuse for ignition coil	Replace .
	Loose connection or disconnection of lead wire	Connect securely .
	Faulty spark plug(s)	Replace .
	Faulty ignition coil(s)	Replace .
	Faulty CKP sensor or CKP sensor plate	Clean, tighten or replace .
	Faulty CMP sensor or sensor rotor tooth of camshaft	Clean, tighten or replace .
	Faulty ECM	Replace .
Poor fuel economy or engine performance	Incorrect ignition timing	Check related sensors and CKP sensor plate .
	Faulty spark plug(s)	Adjust, clean or replace .
	Faulty ignition coil assembly	Replace .
	Faulty CKP sensor or CKP sensor plate	Clean, tighten or replace .
	Faulty CMP sensor or sensor rotor tooth of camshaft	Clean, tighten or replace .
	Faulty knock sensor	Replace .
	Faulty ECM	Replace .