Cranking System Symptom Diagnosis
Possible symptoms of starting system trouble would be 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 exactly where the cause of each trouble lies in battery, wiring harness, starting motor (including magnetic switch) or engine.
Do not remove starting motor just because starting motor does not run. Check the following items and narrow down scope of possible causes.
- Condition of trouble
- Tightness of battery terminals (including ground cable connection on engine) and starting motor terminals
- Discharge of battery
- Mounting of starting motor
POSSIBLE CAUSE REFERENCE
| Condition | Possible Cause | Action |
|---|---|---|
| Starting motor not running (No operating sound of magnetic switch) | Malfunction of Shift switch (4 A/T model and 5 A/T model) | Check shift switch . |
| Malfunction of clutch switch (5 M/T model) | Check clutch switch . | |
| Battery voltage is too low | Check battery . | |
| Charging faulty due to deteriorated battery | Replace battery . | |
| Poor battery terminal connection | Check terminal connection or replace battery . | |
| Poor ground cable connection | Tighten ground cable . | |
| Fuse blown | Replace fuse . | |
| Ignition switch faulty | Check ignition switch , see IGNITION SWITCH INSPECTION . | |
| Magnetic switch faulty | Check magnetic switch , see STARTING MOTOR INSPECTION . | |
| Poor magnetic switch lead wire connector connection | Check connector connection . | |
| Open-circuit between ignition switch and magnetic switch | Repair circuit . | |
| Open-circuit in pull-in coil | Check pull-in coil circuit . | |
| Brushes and/or brush springs faulty | Check brushes and brush springs . | |
| Poor sliding of plunger and/or pinion | Check plunger and pinion . | |
| Starting motor control relay faulty | Check starting motor control relay . | |
| ECM and its circuit faulty | Check ECM and its circuit . | |
| Starting motor not running (Operating sound of magnetic switch heard) | Battery voltage is too low | Check battery . |
| Charging faulty due to deteriorated battery | Replace battery . | |
| Poor battery terminal connection | Check terminal connection or replace battery . | |
| Poor ground terminal connection | Tighten ground cable . | |
| Magnetic switch faulty | Check magnetic switch . | |
| Brushes and/or brush springs faulty | Check brushes and brush springs . | |
| Brush holder faulty | Check brush holder . | |
| Commutator burnt | Check commutator . | |
| Short-circuit between commutator and armature | Check commutator . | |
| Ignition switch faulty | Check ignition switch . | |
| Poor starting motor cable connection | Check starting motor cable connection . | |
| Open circuit between Ignition switch and magnetic switch | Repair circuit . | |
| Open circuit in pull-in coil | Check pull-in coil circuit . | |
| Crank shaft rotation obstructed | Repair engine assembly . | |
| Starting motor running but too slowly (small torque) (If battery and wiring are satisfactory, inspect starting motor) | Magnetic switch faulty | Check magnetic switch . |
| Short-circuit between commutator and armature | Check commutator . | |
| Commutator burnt | Check commutator . | |
| Brushes and/or brush springs faulty | Check brushes and brush springs . | |
| Brush holder faulty | Check brush holder . | |
| Rear bracket bush faulty | Check rear bracket bush . | |
| Starting motor running, but not cranking engine | Worn pinion tip | Replace over-running clutch . |
| Poor sliding of over-running clutch | Check over-running clutch . | |
| Over-running clutch slipping | Replace over-running clutch . | |
| Worn teeth of ring gear | Replace flywheel (M/T model) or drive plate (A/T model) . | |
| Noise | Abnormally worn bush | Replace bush . |
| Worn teeth of pinion | Replace over-running clutch . | |
| Worn teeth of ring gear | Replace flywheel (M/T model) or drive plate (A/T model) . |