TOHATSU BFT115A Service Manual page 151

DTC 10-1, 10-2 (IAT SENSOR VOLTAGE IS TOO LOW OR TOO HIGH)
ECM
12
5V
TA
SG2
13
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
and joint connector 2
them.
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 – Temporary
reappear)
NO – GO TO STEP 2.
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 main wire harness side No.1 (Red/
25
Yellow) terminal and engine ground.
Is the measurement within 4.75 – 5.25 V?
YES – Replace the IAT sensor with a new one
and recheck.
NO – Repair short in the Red/Yellow wire. If the
main wire harness is normal, replace the
ECM with a new one and recheck.
R/Y
G/R
28
21
JOINT
CONNECTOR 2
, ECM connector B
12
, and then reconnect
28
failure (code does
.
25
R/Y
G/R
G/R G/R
13
Bl Black
Y Yellow
Bu Blue
G Green
R Red
W White
,
25
,
13
not
IAT SENSOR 2P CONNECTOR
MAIN WIRE HARNESS SIDE
25
FUEL SYSTEM
IAT SENSOR
25
Brown
Br
O Orange
Lb Light blue
Lg
Light green
P Pink
Gr Gray
TA
(Red/Yellow)
5-33