TOHATSU BFT 250A, Service Manual

Page: 145 / 639

5-23
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FUEL SYSTEM
2. MAP sensor signal line short 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
main wire harness side No.2
(White/Red) terminal and engine ground.
Is the measurement within 4.75 – 5.25 V?
YES – Replace the MAP sensor with a new one
and recheck.
NO – Repair short 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.
DTC 3-2 (MAP SENSOR VOLTAGE IS TOO HIGH)
1. Symptom reproduction test
Turn the combination switch OFF.
Disconnect the MAP sensor 3P connector
,
ECM connector A , ECM connector B
and then reconnect them.
Clear the DTC (page 5-6).
• Continue the procedure if the DTC does not
clear.
Turn the combination switch ON.
Measure the MAP sensor voltage using the HDS.
Is the measurement within 0.23 – 4.49 V?
YES – Temporary failure (code does not
reappear).
NO – GO TO STEP 2.
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
main wire harness side No.1
(Brown/Yellow) terminal and engine ground.
Is the measurement within 4.75 – 5.25 V?
YES – GO TO STEP 3.
NO – 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.
MAP SENSOR 3P CONNECTOR
MAIN WIRE HARNESS SIDE
PB
(White/Red)
MAP SENSOR 3P CONNECTOR
MAIN WIRE HARNESS SIDE
VCC1
(Brown/Yellow)