TOHATSU BFT75A Service Manual page 131

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TROUBLESHOOTING
FUNCTION TEST WITHOUT USING THE Dr.H
1. 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
2. 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
3. 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. MIL inspection
Turn the combination switch OFF.
Short the No.3 terminal (Red/Blue) of the ECM
connector A
connector to engine ground using a jumper wire.
Turn the combination switch ON.
Does the MIL come ON?
YES
NO
4-18
– • Inspect the warning buzzer
• Inspect the indicator light
• Repair the short circuit in the main wire harness
– GO TO STEP 2.
main wire harness side 36P
– GO TO STEP 3.
– • 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 4.
– • Inspect the indicator light
• 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
ACGLP
(White/Blue)
ECM CONNECTOR A
MAIN WIRE HARNESS SIDE
WARNL
(Red/Blue)