Suzuki GA413, Service Manual

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6G-4 CRANKING SYSTEM
DIAGNOSIS
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 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
Motor not running No operating sound of magnetic switch
Battery run down
Battery voltage too low due to battery
deterioration
Poor contact in battery terminal connection
Loose grounding cable connection
Fuse set loose or blown off
Poor contacting action of ignition switch and
magnetic switch
Lead wire coupler loose in place
Open-circuit between ignition switch and
magnetic switch
Open-circuit in pull-in coil
Brushes are seating poorly or worn down
Poor sliding of plunger and/or pinion
Recharge battery.
Replace battery.
Retighten or replace.
Retighten.
Tighten or replace.
Replace.
Retighten.
Repair.
Replace magnetic switch.
Repair or replace.
Repair.
Operating sound of magnetic switch heard
Battery run down
Battery voltage too low due to battery
deterioration
Loose battery cable connections
Burnt main contact point, or poor contacting
action of magnetic switch
Brushes are seating poorly or worn down
Weakened brush spring
Burnt commutator
Poor grounding of field coil
Layer short-circuit of armature
Crankshaft rotation obstructed
Recharge battery.
Replace battery.
Retighten.
Replace magnetic switch.
Repair or replace.
Replace.
Replace armature.
Repair.
Replace.
Repair.