TOHATSU BFT250A Service Manual page 236

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FUEL SYSTEM
CIRCUIT INSPECTION
ECM
12
FLR1 Lg
FLR2 Lg
OPTION
Bl/Y
Bl/Y
COMBINATION
Bl/Y
SWITCH
Bl/Y
Bl/Y
Bl/Y LOAD
W/Bl W/Bl BAT
2
Bl/Y
W/Bl
1. No.8 Fuse (10 A) inspection
Turn the combination switch OFF.
Check for blown No.8 fuse.
Is the fuse blown?
YES
NO
2. Fuel pump power/ground line open circuit
inspection
Turn the combination switch OFF and disconnect
the fuel pump (High pressure side) 2P connector
Turn the combination switch ON.
Measure the battery voltage between the fuel pump
(High pressure side) 2P connector
harness side No.2 (Blue/Red) terminal and No.1
(Black) terminal.
Is there battery voltage for a few seconds?
YES
NO
5-114
No.8 FUSE
(10A)
FUEL
PUMP
RELAY
5 4
Lg Lg
Bu/R Bl
2 1
43
FUEL PUMP
Bl/Y
W/Bl
– 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.
.
– Replace the fuel pump (High pressure
side) with a new one and recheck.
– GO TO STEP 3.
No.4 FUSE No.5 FUSE
(30A) (10A)
MAIN
RELAY
9 4 5 4
29 28 27
Bl Bl/Y Bu/R W/Bl
Bl Bl
24 23
JOINT CONNECTOR 1
main wire
FUEL PUMP
(Blue/Red)
FUSE/RELAY
JUNCTION BOX
T4
BATTERY
GND6
Bl
Bu
11
Bl Black
Y Yellow
Bu Blue
G Green
R Red
GND1 GND3
W White
FUEL PUMP (HIGH PRESSURE SIDE)
2P CONNECTOR
MAIN WIRE HARNESS SIDE
GND3
(Black)
Br Brown
O Orange
Lb Light blue
Lg Light green
P Pink
Gr Gray