TOHATSU BFT250A Service Manual page 112

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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
NO
2. Indicator light/buzzer short circuit inspection
Turn the combination switch OFF and disconnect the ECM connector A
Turn the combination switch ON.
Does the warning buzzer sound and/or indicator come ON?
YES
NO
3. Buzzer inspection
Turn the combination switch OFF.
Short the No.19 terminal (Yellow/Green) of the ECM
connector A
connector to engine ground using a jumper wire.
Turn the combination switch ON.
Does the warning buzzer sound?
YES
NO
4. Alternator indicator light inspection
Turn the combination switch OFF.
Short the No.2 terminal (White/Blue) of the ECM
connector A
connector to engine ground using a jumper wire.
Turn the combination switch ON.
Does the alternator indicator light come ON?
YES
NO
4-20
– 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).
– GO TO STEP 2.
– • Inspect the warning buzzer
• Inspect the indicator light
• Repair the short circuit in the main wire harness
– GO TO STEP 3.
main wire harness side 36P
– GO TO STEP 4.
– • 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
main wire harness side 36P
– GO TO STEP 5.
– • Inspect the indicator light
• Repair the open circuit in the main wire
harness
• Replace the ECM with a new one and
recheck
and B .
ECM CONNECTOR A
MAIN WIRE HARNESS SIDE
BUZZ
(Yellow/Green)
ECM CONNECTOR A
MAIN WIRE HARNESS SIDE
ACG LAMP
(White/Blue)