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

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 or replace 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 drive belt	Adjust or replace drive belt.
	Faulty combination meter	Replace combination meter.
	Faulty ECM	Check ECM.
	Faulty IC regulator or generator	Repair or replace generator.
	Faulty wiring	Repair or replace wiring.

Battery Charge Failure

Condition	Possible Cause	Action
Undercharged battery	Loose or worn drive belt	Adjust or replace drive belt.
	Loose or corroded battery terminal	Tighten battery terminal or replace battery.
	Faulty rectifier, rotor and/or IC regulator	Repair or replace generator.
Overcharged battery	Faulty IC regulator	Repair or replace generator.

Noise

Condition	Possible Cause	Action
Noisy generator	Loose mounting bolts	Tighten mounting bolts.
	Dirty, worn and/or faulty bearings	Repair or replace generator.
	Faulty rotor, diode and/or stator	Repair or replace generator.