1I-2 Starting System:
Diagnostic Information and Procedures
Cranking System Symptom Diagnosis
S5JB0A1904001
Possible symptoms due to 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,
(including starting motor switch), starting motor or engine.
Do not remove motor just because starting motor does not run. Check the following items and narrow down scope of
possible causes.
1) Condition of trouble
2) Tightness of battery terminals (including ground cable connection on engine side) and starting motor terminals
3) Discharge of battery
4) Mounting of starting motor
Condition
Possible cause
Correction / Reference Item
Motor not running – No
operating sound of
magnetic switch
Transmission range sensor is not in P or
N, or not adjusted (A/T)
Shift in P or N, or adjust sensor.
Malfunction of clutch pedal position
switch (M/T)
Adjust or replace.
Battery run down
Recharge battery.
Battery voltage too low due to battery
deterioration
Replace battery.
Poor contact in battery terminal
connection
Retighten or replace.
Loose grounding cable connection
Retighten.
Fuse set loose or blown off
Tighten or replace.
Poor contacting action of ignition switch
and magnetic switch
Replace.
Lead wire coupler loose in place
Retighten.
Open-circuit between ignition switch and
magnetic switch
Repair.
Open-circuit in pull-in coil
Replace magnetic switch.
Brushes are seating poorly or worn
down
Repair or replace.
Poor sliding or plunger and/or pinion
Repair.
Faulty starting motor control relay
“Main Relay, Fuel Pump Relay, Starting Motor
Control Relay and Throttle Actuator Control
Relay Inspection: in Section 1C”.
Faulty ECM and its circuit
“Inspection of ECM and its Circuits: in Section
1A”.
Motor not running –
Operating sound of
magnetic switch heard
Battery run down
Recharge battery.
Battery voltage too low due to battery
deterioration
Replace battery.
Loose battery cable connections
Retighten.
Burnt main contact point, or poor
contacting action of magnetic switch
Replace magnetic switch.
Brushes are seating poorly or worn
down
Repair or replace.
Weakened brush spring
Replace.
Burnt commutator
Replace armature.
Layer short-circuit of armature
Replace.
Crankshaft rotation obstructed
Repair.
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