TOHATSU BFT250A Service Manual page 101

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ENGINE SPEED IS HIGHER (750 min
ELECTRICAL LOAD AFTER WARMING UP
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1. Battery test
Remove the battery.
Check the battery condition using the commercially available battery tester.
Is the battery in good condition?
YES
NO
2. Alternator F line inspection
Turn the combination switch OFF.
Disconnect the alternator 4P connector
Turn the combination switch ON.
Measure the voltage between the alternator 4P
connector
(White/Green) and engine ground.
Is there 4.30 – 5.25 V?
YES
NO
BATTERY
(12V)
OPTION
COMBINATION
SWITCH
LOAD
T3
BAT
GND6
INDICATOR
LAMP
BAT
ACG LAMP
3
G
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2
GND1
– GO TO STEP 2.
– Faulty battery.
wire harness side No.4 terminal
– Replace the alternator with a new one and
recheck.
– Repair open or short circuit in the wire
between the ECM and alternator. If wire
harness is normal, replace the ECM with a
new one and recheck.
-1
(rpm)) THAN THE SPECIFIED IDLE SPEED WITH NORMAL
FUSE/RELAY JUNCTION BOX
No.4 No.5
FUSE FUSE
(30A) (10A)
MAIN
RELAY
No.10
FUSE
(10A)
2 9 4
27 28
T2
STARTER
MOTOR
11
24 23
JOINT CONNECTOR 1
.
ALTERNATOR 4P CONNECTOR
MAIN WIRE HARNESS SIDE
ACGF
(White/Green)
TROUBLESHOOTING
No.1
FUSE
(150A)
4
27 T4 T5 T6
T1
W/G
Y/Bl
ALTERNATOR
W/Bu
W/Bl
7
12
W/Bu
ACG LAMP
W/G ACGF
W/Bu ACGL
13
Bl Black Br Brown
Y Yellow O Orange
Bu Blue Lb Light blue
G Green Lg Light green
R Red P Pink
W White Gr Gray
ECM
4-9