TOHATSU BFT 250A, Service Manual

Page: 163 / 639

5-41
dummyhead dummyhead
FUEL SYSTEM
DTC 140-2 (ECT SENSOR 2 (EMT SENSOR 1)
VOLTAGE IS TOO HIGH)
1. Symptom reproduction test
Turn the combination switch OFF.
Disconnect the EMT sensor 1 2P connector
,
ECM connector A , ECM connector B ,
joint connector 1 and then reconnect them.
Clear the DTC (page 5-6).
• Continue the procedure if the DTC does not
clear.
Turn the combination switch ON.
Measure the EMT sensor 1 voltage using the HDS.
Is the measurement within 0.08 – 4.92 V?
YES – Temporary failure (code does not
reappear).
NO – GO TO STEP 2.
2. EMT sensor 1 signal /GND line open circuit
inspection
Turn the combination switch OFF and disconnect
the EMT sensor 1 2P connector
.
Turn the combination switch ON.
Measure the voltage between the EMT sensor 1 2P
connector
main wire harness side No.1 (Red/
Black) terminal and No.2 (Green) terminal.
Is the measurement within 4.75 – 5.25 V?
YES – Replace the EMT sensor 1 with a new one
and recheck.
NO – Repair open in the Red/Black or Green
wire harness between the ECM and EMT
sensor 1. If the main wire harness is
correct, replace the ECM with a new one
and recheck.
EMT SENSOR 1 2P CONNECTOR
MAIN WIRE HARNESS SIDE
TOH1
(Red/Black)
SG2
(Green)