Isuzu 4JA1 Workshop Manual page 21

15. Starter Motor Problem
Visual/physical check the following items before diagnosis.
The battery terminals connection condition.
The ground connection condition.
The starter motor or the battery fastener condition.
The battery fluid level and specific gravity.
15-1 Starter motor pinion engages to ring gear but engine does not turn over
Step
1 Was "Visual/Physical Check" performed.
2 Check the contact condition between the brush and
the commutator.
Was the brush and the commutator contact
intermittent?
3 Were the brush and the commutator contact faces
dirty?
4 Was the pinion clutch slipped?
5 Inspect the armature field coil.
Was there an open circuit or a short circuit in the
armature field coil?
6 Are any DTC stored?
15-2 Incorrect pinion and ring gear engagement
Step
1 Was "Visual/Physical Check" performed.
2 Inspect the pinion and the ring gear teeth.
Were the pinion and/or the ring gear teeth worn or
broken?
3 Inspect the pinion gear return movement.
Was the pinion gear return movement incorrect?
4 Are any DTC stored?
Action
Action
TROUBLESHOOTING 6 – 19
Value(s) Yes
—
Go to Step 2
— Replace the
brush or repair
the
commutator.
—
Clean contact
face
— Replace the
pinion clutch
— Repair or
replace the
armature field
coil.
— Go to indicated
DTC.
Value(s) Yes
—
Go to Step 2
—
Replace the
wron parts.
— Adjust or
replace the
movement
parts.
— Go to indicated
DTC.
No
Go to
visual/physical
check
Go to Step 3
Go to Step 4
Go to Step 5
Go to Step 6
Solved
No
Go to
visual/physical
check
Go to Step 3
Go to Step 4
Solved