TOHATSU BFT 250A, Service Manual

Page: 112 / 639

4-20
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TROUBLESHOOTING
FUNCTION TEST WITHOUT USING THE HDS
1. Fuse inspection
Turn the combination switch OFF.
Check the No.10 fuse in the fuse/relay junction box.
Is the fuse blown?
YES – Replace the blown fuse and check for short in the main wire harness or incorrect load by referring
to the fuse load chart (page 4-16).
NO – GO TO STEP 2.
2. Indicator light/buzzer short circuit inspection
Turn the combination switch OFF and disconnect the ECM connector A and B .
Turn the combination switch ON.
Does the warning buzzer sound and/or indicator come ON?
YES – • Inspect the warning buzzer
• Inspect the indicator light
• Repair the short circuit in the main wire harness
NO – GO TO STEP 3.
3. Buzzer inspection
Turn the combination switch OFF.
Short the No.19 terminal (Yellow/Green) of the ECM
connector A
main wire harness side 36P
connector to engine ground using a jumper wire.
Turn the combination switch ON.
Does the warning buzzer sound?
YES – GO TO STEP 4.
NO – • Inspect the warning buzzer
• Inspect the combination switch
• Repair the open circuit in the main wire
harness
• Replace the ECM with a new one and
recheck
4. Alternator indicator light inspection
Turn the combination switch OFF.
Short the No.2 terminal (White/Blue) of the ECM
connector A
main wire harness side 36P
connector to engine ground using a jumper wire.
Turn the combination switch ON.
Does the alternator indicator light come ON?
YES – GO TO STEP 5.
NO – • Inspect the indicator light
• Repair the open circuit in the main wire
harness
• Replace the ECM with a new one and
recheck
ECM CONNECTOR A
MAIN WIRE HARNESS SIDE
BUZZ
(Yellow/Green)
ECM CONNECTOR A
MAIN WIRE HARNESS SIDE
ACG LAMP
(White/Blue)