TOHATSU BFT250A Service Manual page 154

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FUEL SYSTEM
DTC 10-1, 10-2 (IAT SENSOR VOLTAGE IS TOO LOW OR TOO HIGH)
ECM
5 V
TA
SG2
DTC 10-1 (IAT SENSOR VOLTAGE IS TOO LOW)
1. Symptom reproduction test
Turn the combination switch OFF.
Disconnect the IAT sensor 2P connector
ECM connector A
joint connector 1
Clear the DTC (page 5-6).
• Continue the procedure if the DTC does not
clear.
Turn the combination switch ON.
Measure the IAT sensor voltage using the HDS.
Is the measurement within 0.08 – 4.92 V?
YES
NO
2. IAT sensor signal line short circuit inspection
Turn the combination switch OFF and disconnect
the IAT sensor 2P connector
Turn the combination switch ON.
Measure the voltage between the IAT sensor 2P
connector
Yellow) terminal and engine ground.
Is the measurement within 4.75 – 5.25 V?
YES
NO
5-32
R/Y
G
JOINT CONNECTOR 1
, ECM connector B
and then reconnect them.
– 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 short in the main wire harness
between the ECM and IAT sensor. If the
main wire is correct, replace the ECM with
a new one and recheck.
3 4
,
,
does not
.
IAT SENSOR 2P CONNECTOR
MAIN WIRE HARNESS SIDE
IAT SENSOR
R/Y
G
Bl: Black Br: Brown
Y: Yellow O: Orange
Bu: Blue Lb: Light blue
G: Green Lg: Light green
R: Red P: Pink
W: White Gr: Gray
TA
(Red/Yellow)