TOHATSU BFT75A Service Manual page 242

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3. Pump harness inspection
Turn the combination switch OFF and disconnect
the PGM-FI/main relay 6P connector
Check for continuity between the PGM-FI/main
relay 6P connector
No.3 (Blue/Red) terminal and fuel pump (high
pressure side) 2P connector
harness side No.1 (Blue/Red) terminal.
Check for continuity between the fuel pump (high
pressure side) 2P connector
harness side No.2 (Black) terminal and engine
ground.
Is there continuity?
YES
NO
4. PGM-FI/main relay inspection
Turn the combination switch OFF.
Remove the PGM-FI/main relay.
Check the MAIN circuit and FUEL circuit in the
PGM-FI/main relay (page 10-13).
Is the PGM-FI/main relay normal?
YES
NO
main wire harness side
– GO TO STEP 4.
– • Repair open in the Blue/Red wire.
• Repair open in the Black wire.
– • Repair the open in the wire harness
between the No.1 fuse and PGM-FI/
main relay.
• Repair the open in the wire harness
between the PGM-FI/main relay and
ECM.
• If wire harness is normal, replace the
ECM with a new one and recheck.
– Replace the PGM-FI/main relay with a new
one and recheck.
.
main wire
main wire
FUEL SYSTEM
FUEL PUMP 1
(Blue/Red)
GND1
(Black)
5-101