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.
Before removing the starting motor to perform inspection, check the following items to narrow down the possible causes of trouble.
- Tightness of battery terminals (including ground cable connection on engine) and starting motor terminals
- Discharge of battery
- Mounting of starting motor
CRANKING SYSTEM SYMPTOM DIAGNOSIS CHART
| Condition | Possible Cause | Action |
|---|---|---|
| Starting motor not running (No operating sound of magnetic switch) | Malfunction of P position switch (CVT model) | Check P position switch, see TRANSMISSION RANGE SENSOR INSPECTION . |
| Malfunction of clutch pedal position switch (M/T model) | Check clutch pedal position switch, see CPP SWITCH INSPECTION AND ADJUSTMENT . | |
| Battery voltage is too low | Check battery, see. BATTERY INSPECTION | |
| Charging faulty due to deteriorated battery | Replace battery, see BATTERY REMOVAL AND INSTALLATION . | |
| Poor battery terminal connection | Check terminal connection or replace battery, see BATTERY REMOVAL AND INSTALLATION . | |
| Poor ground cable connection | Tighten ground cable . | |
| Blown fuse | Replace fuse . | |
| Faulty magnetic switch | Check magnetic switch, see STARTING MOTOR INSPECTION . | |
| Poor magnetic switch lead wire connector connection | Check connector connection, see STARTING MOTOR REMOVAL AND INSTALLATION . | |
| Open-circuit between battery and magnetic switch | Repair circuit. | |
| Open-circuit in pull-in coil | Check pull-in coil circuit, see STARTING MOTOR INSPECTION . | |
| Faulty brushes and/or brush springs | Check brushes and brush springs, see STARTING MOTOR INSPECTION . | |
| Poor sliding of plunger and/or pinion | Check plunger and pinion, see STARTING MOTOR INSPECTION . | |
| Faulty starting motor control relay | Check starting motor control relay, see Starting Motor Control Relay Inspection . | |
| Faulty ECM and its circuit | Check ECM and its circuit, see INSPECTION OF ECM AND ITS CIRCUITS . | |
| Faulty keyless start system | Check keyless start system, see INSPECTION OF KEYLESS START CONTROL MODULE AND ITS CIRCUITS | |
| Starting motor not running (Operating sound of magnetic switch heard) | Battery voltage is too low | Check battery, see BATTERY INSPECTION . |
| Charging faulty due to deteriorated battery | Replace battery, see BATTERY REMOVAL AND INSTALLATION . | |
| Poor battery terminal connection | Check terminal connection or replace battery, see BATTERY REMOVAL AND INSTALLATION . | |
| Poor ground terminal connection | Tighten ground cable. | |
| Faulty magnetic switch | Check magnetic switch, see STARTING MOTOR INSPECTION . | |
| Faulty brushes and/or brush springs | Check brushes and brush springs, see STARTING MOTOR INSPECTION . | |
| Faulty brush holder | Check brush holder, see STARTING MOTOR INSPECTION . | |
| Burnt commutator | Check commutator, see STARTING MOTOR INSPECTION . | |
| Short-circuit between commutator and armature | Check commutator, see STARTING MOTOR INSPECTION . | |
| Poor starting motor cable connection | Check starting motor cable connection, see STARTING MOTOR REMOVAL AND INSTALLATION . | |
| Open circuit between battery and magnetic switch | Repair circuit. | |
| Obstructed crankshaft rotation | Repair engine assembly. | |
| Starting motor running but too slowly (small torque) (If battery and wiring are satisfactory, inspect starting motor) | Faulty magnetic switch | Check magnetic switch, see STARTING MOTOR INSPECTION . |
| Low battery voltage | Check battery, see BATTERY INSPECTION . | |
| Charging faulty due to deteriorated battery | Replace battery, see BATTERY REMOVAL AND INSTALLATION . | |
| Poor battery terminal connection | Check terminal connection or replace battery, see BATTERY REMOVAL AND INSTALLATION . | |
| Short-circuit between commutator and armature | Check commutator, see STARTING MOTOR INSPECTION . | |
| Burnt commutator | Check commutator, see STARTING MOTOR INSPECTION . | |
| Faulty brushes and/or brush springs | Check brushes and brush springs, see STARTING MOTOR INSPECTION . | |
| Faulty brush holder | Check brush holder, see STARTING MOTOR INSPECTION . | |
| Faulty rear bracket bushing | Check rear bracket bushing, see STARTING MOTOR INSPECTION . | |
| Starting motor running, but not cranking engine | Worn pinion tip | Replace overrunning clutch, see STARTING MOTOR COMPONENTS . |
| Poor sliding of overrunning clutch | Check overrunning clutch, see STARTING MOTOR INSPECTION . | |
| Slipping overrunning clutch | Replace overrunning clutch, see STARTING MOTOR COMPONENTS . | |
| Worn teeth of ring gear | Replace flywheel (M/T model) or drive plate (CVT model), see FLYWHEEL/DRIVE PLATE REMOVAL AND INSTALLATION . | |
| Noise | Abnormally worn bushing | Replace bushing, see STARTING MOTOR COMPONENTS . |
| Worn teeth of pinion | Replace overrunning clutch, see STARTING MOTOR COMPONENTS . | |
| Worn teeth of ring gear | Replace flywheel (M/T model) or drive plate (CVT model), see FLYWHEEL/DRIVE PLATE REMOVAL AND INSTALLATION . |