TOHATSU BFT250A Service Manual page 148

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FUEL SYSTEM
DTC 6-1, 6-2 (ECT SENSOR 1 (EBT SENSOR) VOLTAGE IS TOO LOW OR TOO
HIGH)
ECM
5 V
TE
SG2
DTC 6-1 (ECT SENSOR 1 (EBT SENSOR) VOLTAGE
IS TOO LOW)
1. Symptom reproduction test
Turn the combination switch OFF.
Disconnect the EBT sensor 2P connector
ECM connector A
switch wire 6P connector
Clear the DTC (page 5-6).
• Continue the procedure if the DTC does not
clear.
Turn the combination switch ON.
Measure the EBT sensor voltage using the HDS.
Is the measurement within 0.08 – 4.92 V?
YES
NO
2. EBT sensor signal line short circuit inspection
Turn the combination switch OFF and disconnect
the EBT sensor 2P connector
Turn the combination switch ON.
Measure the voltage between the EBT sensor 2P
connector
White) terminal and engine ground.
Is the measurement within 4.75 – 5.25 V?
YES
NO
5-26
R/W R/W
G
G
3 5
, ECM connector B
, joint connector 1
and then reconnect them.
– Temporary failure (code
reappear).
– GO TO STEP 2.
main wire harness side No.1 (Red/
– Replace the EBT sensor with a new one
and recheck.
– Repair short in the main wire harness
between the ECM and EBT sensor. If the
main wire is correct, replace the ECM with
a new one and recheck.
R/W
G/R
JOINT CONNECTOR 1
,
,
does not
.
EBT SENSOR 2P CONNECTOR
MAIN WIRE HARNESS SIDE
ECT SENSOR 1
(EBT SENSOR)
R/W
G/R
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
TE
(Red/White)