Starting motor running but too slow (small torque)

Possible symptoms of starting system trouble are as follows:

•Starting motor does not run (or runs slowly).
•Starting motor runs but fails to crank engine.
•Abnormal noise is heard.

Proper diagnosis must be made to determine in which of the battery, wiring harness, starting motor (including magnetic switch) and engine the cause of each trouble lies.

Before removing the starting motor, check the following items to identify most possible cause of trouble.

1)Condition of trouble

2)Tightness of battery terminals (including ground cable connection on engine) and starting motor terminals

3)Discharge of battery

4)Mounting of starting motor

Condition	Possible Cause	Action
Starting motor running but too slow (small torque)	Faulty magnetic switch	•Non-ENG A-STOP model: Check magnetic switch. •ENG A-STOP model: Replace starting motor.
	Low battery voltage	Check battery.
	Impossible charging due to deteriorated battery	Replace battery.
	Poor battery terminal connection	Check terminal connection or replace battery.
	Short circuit between commutator and armature	•Non-ENG A-STOP model: Check commutator. •ENG A-STOP model: Replace starting motor.
	Burnt commutator	•Non-ENG A-STOP model: Check commutator. •ENG A-STOP model: Replace starting motor.
	Defective brushes and/or brush springs	•Non-ENG A-STOP model: Check brushes and brush springs. •ENG A-STOP model: Replace starting motor.
	Defective brush holder	•Non-ENG A-STOP model: Check brush holder. •ENG A-STOP model: Replace starting motor.
	Defective rear bracket bushing	•Non-ENG A-STOP model: Check rear bracket bushing. •ENG A-STOP model: Replace starting motor.