TOHATSU BFT 250A, Service Manual

Page: 179 / 639

5-57
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FUEL SYSTEM
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
main wire harness side No.1 (Red/
Yellow) terminal and No.2 (Green) terminal.
Is the measurement within 4.75 – 5.25 V?
YES – Replace the IAT sensor with a new one
and recheck.
NO – 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.
MIL BLINKS 14 TIMES (ONE LONG BLINK AND 4 SHORT BLINKS) IAC VALVE
1. Symptom reproduction test
Turn the combination switch OFF.
Disconnect the IAC valve 2P connector
, ECM
connector B and then reconnect them.
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 – GO TO STEP 2.
NO – Temporary failure (code does not
reappear).
SG2
(Green)
IAT SENSOR 2P CONNECTOR
MAIN WIRE HARNESS SIDE
TA
(Red/Yellow)
Bl: Black
Y: Yellow
Bu: Blue
G: Green
R: Red
W: White Br: Brown
O: Orange
Lb: Light blue
Lg: Light green
P: Pink
Gr: Gray
ECM
IAC
VALVE
G
2
EACVP
36
18
EACVM Bl
G
Bl
1