TOHATSU BFT75A Service Manual page 173

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FUEL SYSTEM
DTC 10-2 (IAT SENSOR VOLTAGE IS TOO HIGH)
• When the DTC code 6-2, 7-2, 10-2, 22-2, 140-2, and
141-2 are indicated at the same time, the ground line
(SG2) is open.
1. Symptom reproduction test
Turn the combination switch OFF.
Disconnect the IAT sensor 2P connector
ECM connector A
and joint connector 2
them.
Clear the DTC (page 5-5).
• Continue the procedure if the DTC does not
clear.
Turn the combination switch ON.
Measure the IAT sensor voltage using the Dr.H.
Is the measurement within 0.08 – 4.92 V?
YES
NO
2. IAT sensor signal line open circuit inspection
Turn the combination switch OFF and disconnect
the IAT 2P connector
Turn the combination switch ON.
Measure the voltage between the IAT sensor 2P
connector
Yellow) terminal and No.2 (Green) terminal.
Is the measurement within 4.75 – 5.25 V?
YES
NO
5-32
, ECM connector B
, and then reconnect
– Temporary failure (code
reappear)
– GO TO STEP 2.
.
main wire harness side No.1 (Red/
– Replace the IAT sensor with a new one
and recheck.
– Repair open in the Red/Yellow wire or
Green wire. If the main wire harness is
normal, replace the ECM with a new one
and recheck.
,
,
does not
IAT SENSOR 2P CONNECTOR
MAIN WIRE HARNESS SIDE
SG2
(Green)
TA
(Red/Yellow)