TOHATSU BFT75A - Page 199

5-58
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FUEL SYSTEM
MIL BLINKS 10 (ONE LONG BLINK AND NO SHORT BLINK) IAT SENSOR
• When the MIL blinks 6, 7, 10, 22, 24, and 25 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 , ECM connector B ,
and joint connector 2 , and then reconnect
them.
Clear the DTC (page 5-5).
Turn the combination switch OFF and connect the
SCS service check connector.
Turn the combination switch ON and check the
number of blinks of the MIL.
Does the MIL blink 10 (one long blink)?
YES – GO TO STEP 2.
NO – Temporary failure (code does not
reappear)
2. IAT sensor signal open or short circuit/GND line
open 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
wire
• Repair open in the Green wire
• If the main wire harness is normal,
replace the ECM with a new one, and
recheck.
G
25
ECM
IAT
SENSOR
SG2
28
2
19
1
R/Y
23
TA
29
R/Y
G
5V
21
13
GG
12
JOINT CONNECTOR 2
BLACK
YELLOW
BLUE
GREEN
RED
WHITE
BROWN
ORANGE
LIGHT BLUE
LIGHT GREEN
PINK
GRAY
Bl
Y
Bu
G
R
W
Br
O
Lb
Lg
P
Gr
IAT SENSOR 2P CONNECTOR
MAIN WIRE HARNESS SIDE
TA
(Red/Yellow)
SG2
(Green)