TOHATSU BFT75A Service Manual page 180

dummyhead dummyhead
NO
2. HO2S heater inspection
Turn the combination switch OFF.
Inspect the HO2S heater (page 5-108).
Is the HO2S heater normal?
YES
NO
DTC 140-1, 140-2 (ECT SENSOR 2 VOLTAGE IS TOO LOW OR TOO HIGH)
ECM
5V
TOH1
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 140-1 (ECT SENSOR 2 VOLTAGE IS TOO LOW)
1. Symptom reproduction test
Turn the combination switch OFF.
Disconnect the ECT sensor 2 (2P) connector
ECM connector A
joint connector 2
Clear the DTC (page 5-5).
• Continue the procedure if the DTC does not
clear.
Turn the combination switch ON.
Measure the ECT sensor 2 voltage using the Dr.H.
Is the measurement within 0.08 – 4.92 V?
YES
NO
– Temporary failure (code
reappear)
– Repair open in the main wire harness
between the No.4 fuse and the HO2S or
between the HO2S and ECM. If the main
wire harness is correct, replace the ECM
with a new one and recheck.
– Replace the HO2S with a new one and
recheck.
29
R/Bl
G
28
JOINT CONNECTOR 2
, ECM connector B
and then reconnect them.
– Temporary failure (code
reappear)
– GO TO STEP 2.
does not
G G
21
19
12
,
,
does not
FUEL SYSTEM
ECT
SENSOR 2
17
R/Bl
G
5-39