TOHATSU BFT75A Service Manual page 245

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FUEL SYSTEM
CIRCUIT INSPECTION
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
1. Fuel injector power line open circuit inspection
Turn the combination switch OFF and disconnect
the fuel injector 2P connectors
and
Turn the combination switch ON.
Measure the battery voltage between each fuel
injector 2P connector main wire harness side No.1
(Yellow/Black) terminal and ground.
Is battery voltage present?
YES
NO
2. Fuel injector signal line open or short circuit
Inspection
Turn the combination switch OFF.
Disconnect the ECM connector B
Check for open or short circuit between each fuel
injector 2P connector main wire harness side No.2
terminal and ECM connector B
harness side terminal.
Is circuit normal?
YES
NO
5-104
ECM
37
INJ4 Y
INJ3 Bu
R
INJ2
INJ1 Br
28
13
.
– GO TO STEP 2.
– • Repair the open in the wire harness
between the No.5 fuse and fuel injector.
• Faulty joint connector 1
– Circuit is normal.
– Repair the open or short circuit wire
between the fuel injector and ECM.
FUEL FUEL FUEL
INJECTOR 4 INJECTOR 3 INJECTOR 2
36 35
1 2 1 2 1
21 20 19 18 24
JOINT CONNECTOR 1
, , ,
FUEL INJECTOR 2P CONNECTOR
MAIN WIRE HARNESS SIDE
.
main wire
FUEL
INJECTOR 1
No.5
FUSE
(15 A)
34
2 1 2
IGP 2
(Yellow/Black)