TOHATSU BFT250A Service Manual page 164

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FUEL SYSTEM
DTC 141-1, 141-2 (ECT SENSOR 3 (EMT SENSOR 2) VOLTAGE IS TOO LOW
OR TOO HIGH)
ECM
5 V
TOH2
SG2
DTC 141-1 (ECT SENSOR 3 (EMT SENSOR 2)
VOLTAGE IS TOO LOW)
1. Symptom reproduction test
Turn the combination switch OFF.
Disconnect the EMT sensor 2 2P connector
ECM connector A
joint connector 1
Clear the DTC (page 5-6).
• Continue the procedure if the DTC does not
clear.
Turn the combination switch ON.
Measure the EMT sensor 2 voltage using the HDS.
Is the measurement within 0.08 – 4.92 V?
YES
NO
2. EMT sensor 2 signal line short circuit inspection
Turn the combination switch OFF and disconnect
the EMT sensor 2 2P connector
Turn the combination switch ON.
Measure the voltage between the EMT sensor 2 2P
connector
terminal and engine ground.
Is the measurement within 4.75 – 5.25 V?
YES
NO
5-42
R
G
JOINT CONNECTOR 1
, ECM connector B
and then reconnect them.
– Temporary failure (code
reappear).
– GO TO STEP 2.
main wire harness side No.1 (Red)
– Replace EMT sensor 2 with a new one and
recheck.
– Repair short in the main wire harness
between the ECM and EMT sensor 2. If
the main wire is correct, replace the ECM
with a new one and recheck.
3 1
,
,
does not
.
EMT SENSOR 2 2P CONNECTOR
MAIN WIRE HARNESS SIDE
ECT SENSOR 3
(EMT SENSOR 2)
R
G
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
TOH2
(Red)