Cranking System Symptom Diagnosis
Precautions: General safety (00)
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.
•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 not running (No operating sound of magnetic switch)
|
Malfunction of CPP No.1 switch (M/T-keyless push start model or M/T-ENG A-STOP model)
|
Check CPP No.1 switch.
|
|
Malfunction of transmission range sensor (A/T model)
|
Check transmission range sensor.
|
|
|
Battery voltage is too low
|
Check battery.
|
|
|
Impossible charging due to deteriorated battery
|
Replace battery.
|
|
|
Poor battery terminal connection
|
Check terminal connection or replace battery.
|
|
|
Poor ground cable connection
|
Tighten ground cable.
|
|
|
Blown fuse
|
Replace fuse and check its circuit.
|
|
|
Faulty magnetic switch
|
•Non-ENG A-STOP model: Check magnetic switch.
•ENG A-STOP model: Replace starting motor. |
|
|
Poor magnetic switch lead wire connector connection
|
Check connector connection.
|
|
|
Open circuit in pull-in coil
|
•Non-ENG A-STOP model: Check pull-in coil circuit.
•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. |
|
|
Poor sliding of plunger and/or pinion
|
•Non-ENG A-STOP model: Check plunger and pinion.
•ENG A-STOP model: Replace starting motor. |
|
|
Faulty starting motor control relay
|
Check starting motor control relay.
|
|
|
Faulty ST2 relay (ENG A-STOP model)
|
Check ST2 relay.
|
|
|
Faulty keyless push start system (keyless push start model)
|
Check keyless push start system.
|
|
|
Faulty ignition switch (ignition switch model)
|
Check ignition switch.
|
|
|
Faulty ENG A-STOP control module (ENG A-STOP model)
|
Check ENG A-STOP control module.
|
|
|
Starting motor not running (Operating sound of magnetic switch heard)
|
Battery voltage is too low
|
Check battery.
|
|
Impossible charging due to deteriorated battery
|
Replace battery.
|
|
|
Poor battery terminal connection
|
Check terminal connection or replace battery.
|
|
|
Poor ground terminal connection
|
Tighten ground cable.
|
|
|
Faulty magnetic switch
|
•Non-ENG A-STOP model: Check magnetic switch.
•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. |
|
|
Burnt commutator
|
•Non-ENG A-STOP model: Check commutator.
•ENG A-STOP model: Replace starting motor. |
|
|
Short circuit between commutator and armature
|
•Non-ENG A-STOP model: Check commutator.
•ENG A-STOP model: Replace starting motor. |
|
|
Poor starting motor cable connection
|
Check starting motor cable connection.
|
|
|
Open circuit between battery and magnetic switch
|
Repair circuit.
|
|
|
Obstructed crankshaft rotation
|
Repair engine assembly.
|
|
|
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. |
|
|
Starting motor running, but not cranking engine
|
Worn pinion tip
|
•Non-ENG A-STOP model: Replace overrunning clutch.
•ENG A-STOP model: Replace starting motor. |
|
Poor sliding of overrunning clutch
|
•Non-ENG A-STOP model: Check overrunning clutch.
•ENG A-STOP model: Replace starting motor. |
|
|
Slipping overrunning clutch
|
•Non-ENG A-STOP model: Replace overrunning clutch.
•ENG A-STOP model: Replace starting motor. |
|
|
Worn teeth of ring gear
|
Replace flywheel (M/T model) or drive plate (A/T model).
|
|
|
Noise
|
Abnormally worn bushing
|
•Non-ENG A-STOP model: Replace bushing.
•ENG A-STOP model: Replace starting motor. |
|
Worn teeth of pinion
|
•Non-ENG A-STOP model: Replace overrunning clutch.
•ENG A-STOP model: Replace starting motor. |
|
|
Worn teeth of ring gear
|
Replace flywheel (M/T model) or drive plate (A/T model).
|