Generator Symptom Diagnosis

Precautions: Precautions for Handling Battery · Precautions for Replacing Battery · General safety (00)

Trouble in charging system will show up as one or more of the following conditions.

Charging Warning Light Operation Failure

NOTE:

When ENG A-STOP system stops engine in normal condition, charge warning light does not light up.

Check “Charge Light” in Scan Tool Data to identify easily most possible cause of trouble. “Charge Light” indicates command signal of charge warning light from ECM to combination meter.

Condition	Possible Cause	Action
Charge warning light does not light with ignition “ON” and engine off	Blown fuse	Replace fuse.
	Faulty combination meter	Replace combination meter.
	Faulty ECM	Check ECM.
	Faulty CAN communication line	Repair or replace CAN communication line.
	Faulty wiring	Repair wiring.
	Faulty IC regulator or field coil	Repair or replace generator.
Charge warning light does not go out with engine running (battery requires frequent recharging)	Loose or worn generator drive belt	Replace generator drive belt and/or generator drive belt tensioner.
	Faulty combination meter	Replace combination meter.
	Faulty ECM	Check ECM.
	Faulty IC regulator or generator	Repair or replace generator.
	Faulty wiring	Repair wiring.

Battery Charging Failure

Condition	Possible Cause	Action
Undercharged battery	Loose or worn generator drive belt	Replace generator drive belt and/or generator drive belt tensioner.
	Faulty one way clutch pulley	Replace one way clutch pulley.
	Loosen or corroded battery terminals	Tighten battery terminals or replace battery.
	Faulty rectifier, rotor or IC regulator	Repair or replace generator.
Overcharged battery	Faulty IC regulator	Repair or replace generator.

Noise

Condition	Possible Cause	Action
Noisy generator	Loosen mounting bolts	Tighten mounting bolts.
	Faulty rotor, diode or stator	Repair or replace generator.
	Dirty, worn or faulty bearings	Repair or replace generator.
	Faulty one way clutch pulley	Replace one way clutch pulley.