TOHATSU BFT115A Service Manual page 250

FUEL SYSTEM
2. Fuel pump power/ground line open circuit
inspection
Turn the combination switch OFF and disconnect
the fuel pump (High pressure side) 2P connector
37
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/White) terminal.
Is there battery voltage for a few seconds?
YES
NO
3. Fuel pump relay Inspection
Turn the combination switch OFF.
Inspect the fuel pump relay (page 10-14).
Is the fuel pump relay normal?
YES
NO
4. Fuse/relay junction box inspection
Turn the combination switch OFF.
Inspect the fuel pump relay circuit in the fuse/relay
junction box (page 10-14).
Is the fuse/relay junction box normal?
YES
NO
5. Fuel pump relay line Inspection
Install the fuel pump relay and fuse/relay junction
box.
Disconnect the ECM connector A
Turn the combination switch ON.
Measure the voltage as follows:
– ECM connector A
No.13 (Light green) terminal and engine ground
– ECM connector A
No.14 (Pink) terminal and engine ground
Is battery voltage present?
YES
NO
5-132
.
– Replace the fuel pump (High pressure
side) with a new one and recheck.
– GO TO STEP 3.
– GO TO STEP 4.
– Replace the fuel pump relay with a new
one and recheck.
– GO TO STEP 5.
– Replace the fuse/relay junction box with a
new one and recheck.
main wire harness side
12
main wire harness side
12
– • Repair the open in the Blue/Red wire
harness between
junction box and fuel pump (High
pressure side).
• Repair the open in the Black/White wire
harness between the fuel pump (High
pressure side) and engine ground.
• If wire harness is normal, replace the
ECM with a new one and recheck.
– Repair the open or short in the Light green
wire or Pink wire.
FUEL PUMP (HIGH PRESSURE SIDE)
2P CONNECTOR
MAIN WIRE HARNESS SIDE
main wire
37
FUEL PUMP
(Blue/Red)
ECM CONNECTOR A
MAIN WIRE HARNESS SIDE
.
12
FLR 2
(Pink)
the fuse/relay
37
GND2
(Black/White)
12
FLR 1
(Light green)