TOHATSU BFT250A Service Manual page 173

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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 line open/short 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
main wire harness side No.1
– GO TO STEP 3.
– Repair open in the main wire harness
between the ECM and MAP sensor. If the
main wire harness is correct, 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 between the ECM and MAP
sensor.
• Repair open in the Green wire between
the ECM and MAP sensor.
• If the main wire harness is correct,
replace the ECM with a new one, and
recheck
.
MAP SENSOR 3P CONNECTOR
MAIN WIRE HARNESS SIDE
SG1
(Green)
FUEL SYSTEM
VCC1
(Brown/Yellow)
MAP SENSOR 3P CONNECTOR
MAIN WIRE HARNESS SIDE
PB
(White/Red)
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