TOHATSU BFT115A Service Manual page 109

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 4-14).
NO – GO TO STEP 2.
2. Indicator light/warning buzzer inspection
Turn the combination switch OFF.
Disconnect the ECM connector A
Turn the combination switch ON.
Do the indicator lights and warning buzzer operate?
YES – • Repair the short circuit in the main wire harness.
• Inspect the warning buzzer
• Inspect the indicator light(s)
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
12
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.1 terminal (White/Blue) of the ECM
connector A main wire harness side
12
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
and ECM connector B
12
TROUBLESHOOTING
.
13
ECM CONNECTOR A
MAIN WIRE HARNESS SIDE
12
BUZZ
(Yellow/Green)
ECM CONNECTOR A
MAIN WIRE HARNESS SIDE
12
ACGLP
(White/Blue)
4-19