TOHATSU BFT250A Service Manual page 179

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2. IAT sensor signal/GND line open/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 No.2 (Green) terminal.
Is the measurement within 4.75 – 5.25 V?
YES
NO
MIL BLINKS 14 TIMES (ONE LONG BLINK AND 4 SHORT BLINKS) IAC VALVE
ECM
EACVP
EACVM
1. Symptom reproduction test
Turn the combination switch OFF.
Disconnect the IAC valve 2P connector
connector B
Reset the ECM (page 5-6).
Start the engine.
Turn the combination switch OFF and connect the
SCS service connector.
Turn the combination switch ON and check the
number of blinks of the MIL.
Does the MIL blink 14 times?
YES
NO
main wire harness side No.1 (Red/
– Replace the IAT sensor with a new one
and recheck.
– Repair open or short in the Red/Yellow or
Green wire harness between the ECM and
IAT sensor. If the main wire harness is
correct, replace the ECM with a new one
and recheck.
G
Bl
and then reconnect them.
– GO TO STEP 2.
– Temporary failure (code
reappear).
.
, ECM
does not
FUEL SYSTEM
IAT SENSOR 2P CONNECTOR
MAIN WIRE HARNESS SIDE
SG2
TA
(Green)
(Red/Yellow)
IAC
VALVE
G
Bl
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
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