Sakai TW504 - Engine; Engine will Not Start (Starter Motor Does Not Run) 1;3

10-092
TROUBLESHOOTING
SW504
4-2. Engine
Check following items before troubleshooting.
No blown fuses and power is applied up to fuses.
Check any ground circuit which belongs to components to be checked.
4-2-1. Engine will not start (Starter motor does not run) 1/3
F-R lever must be in “N”.
Parking brake switch must be applied.
Brake pedal is not depressed.
Reference Fig.: 4-2-1
Check point Check/Cause Action
1. Battery Measure battery voltage or specic gravity.
Standard voltage : 12 V or more
Standard gravity : 1.26 or more
If value is below standard, battery capacity is insufcient.
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Charge or replace
battery.
2. Starter Switch Check continuity between O-O according to starter switch
connection table.
Switch is OK if there is continuity between connection
O-O.
If there is no continuity, starter switch is faulty.
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Replace starter
switch.
3. Starter Motor (1) When starter switch is ON, measure voltage between
starter motor terminal B and chassis ground.
Standard voltage : 12 V or more
(2) When starter switch is START, measure voltage between
starter motor terminal S and chassis ground.
Standard voltage : 12 V or more
If above items (1) and (2) are OK and starter motor does not
run, starter motor is faulty.
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Replace starter
motor.
4. Starter Relay (1) When starter switch is START, measure voltage between
starter relay terminal 86 inlet wire LY and chassis ground.
Standard voltage : 12 V or more
(2) When starter switch is START, measure voltage between
starter relay terminal 87 inlet wire W and chassis ground.
Standard voltage : 12 V or more
(3) When starter switch is START, measure voltage between
starter relay terminal 30 outlet wire BR and chassis ground
Standard voltage : 12 V or more
If above items (1) and (2) are OK and item (3) is NG, starter
relay is faulty.
•
Replace starter relay.
5. Battery Relay (1) When starter switch is OFF, measure voltage between
battery relay primary terminal COM and chassis ground.
Standard voltage : 12 V or more
(2) When starter switch is ON, measure voltage between
battery relay coil terminal BR inlet wire LgW and coil
ground terminal outlet wire B.
Standard voltage : 12 V or more
(3) When starter switch is ON, measure voltage between
battery relay secondary terminal NO and chassis ground.
Standard voltage : 12 V or more
If above items (1) and (2) are OK and item (3) is NG, battery
relay is faulty.
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Replace battery relay.
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