TOHATSU BFT250A Service Manual page 141

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3. MIL ON line short circuit inspection
Turn the combination switch OFF.
Disconnect ECM connector A
Turn the combination switch ON and check the MIL.
Does the MIL go OFF?
YES
NO
4. MAP sensor power line short circuit inspection 1
Turn the combination switch OFF.
Connect ECM connector A
Disconnect the MAP sensor 3P connector
Turn the combination switch ON and check the MIL.
Does the MIL go OFF?
YES
NO
5. MAP sensor power line short circuit inspection 2
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
6. TP sensor power line short circuit inspection 1
Turn the combination switch OFF.
Disconnect the TP sensor 3P connector
Turn the combination switch ON and check the MIL.
Does the MIL go OFF?
YES
NO
7. TP sensor power line short circuit inspection 2
Measure the voltage between the TP sensor 3P
connector
terminal and engine ground.
Is the measurement within 4.75 – 5.25 V?
YES
NO
– GO TO STEP 4.
– Repair short in the main wire harness
between the ECM and the MIL.
.
– Replace the MAP sensor.
– GO TO STEP 5.
main wire harness side No.1
– GO TO STEP 6.
– Repair short in the main wire harness
between the ECM and the MAP sensor.
– Replace the TP sensor.
– GO TO STEP 7.
main wire harness side No.3 (Blue)
– GO TO STEP 8.
– Repair short in the main wire harness
between the ECM and the TP sensor.
.
.
MAP SENSOR 3P CONNECTOR
MAIN WIRE HARNESS SIDE
.
FUEL SYSTEM
VCC1
(Brown/Yellow)
TP SENSOR 3P CONNECTOR
MAIN WIRE HARNESS SIDE
VCC2
(Blue)
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