TOHATSU BFT75A Service Manual page 191

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FUEL SYSTEM
2. MAP sensor power line open circuit inspection
Turn the combination switch OFF and disconnect
the MAP sensor 3P connector
Turn the combination switch ON.
Measure the voltage between the MAP sensor 3P
connector
(Brown/Yellow) terminal and engine ground.
Is the measurement within 4.75 – 5.25 V?
YES
NO
3. MAP sensor signal open or short circuit/GND
line open circuit inspection
Measure the voltage between the MAP sensor 3P
connector
(White/Red) terminal and No.3 (Green) terminal.
Is the measurement within 4.75 – 5.25 V?
YES
NO
5-50
main wire harness side No.1
– GO TO STEP 3.
– Repair open in the Brown/Yellow wire. If
the main wire harness is normal, replace
the ECM with a new one and recheck.
main wire harness side No.2
– Replace the MAP sensor with a new one
and recheck.
– • Repair open or short in the White/Red
wire.
• Repair open in the Green wire.
• If the main wire harness is normal,
replace the ECM with a new one, and
recheck.
.
MAP SENSOR 3P CONNECTOR
MAIN WIRE HARNESS SIDE
MAP SENSOR 3P CONNECTOR
MAIN WIRE HARNESS SIDE
SG1
(Green)
VCC1
(Brown/Yellow)
PB
(White/Red)