TOHATSU BFT75A Service Manual page 172

dummyhead dummyhead
DTC 10-1, 10-2 (IAT SENSOR VOLTAGE IS TOO LOW OR TOO HIGH)
ECM
5V
SG2
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
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 5-5).
• Continue the procedure if the DTC does not
clear.
Turn the combination switch ON.
Measure the IAT sensor voltage using the Dr.H.
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
29
TA R/Y
G
28
, ECM connector B
, and then reconnect
– Temporary failure
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 Red/Yellow wire. If the
main wire harness is normal, replace the
ECM with a new one and recheck.
G G
12
21
13
JOINT CONNECTOR 2
,
,
(code does not
.
FUEL SYSTEM
IAT
SENSOR
19
R/Y
G
IAT SENSOR 2P CONNECTOR
MAIN WIRE HARNESS SIDE
TA
(Red/Yellow)
5-31