TOHATSU BFT75A Service Manual page 181

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FUEL SYSTEM
2. ECT sensor 2 signal line short circuit inspection
Turn the combination switch OFF and disconnect
the ECT sensor 2 (2P) connector
Turn the combination switch ON.
Measure the voltage between the ECT sensor 2
(2P) connector
(Red/Black) terminal and engine ground.
Is the measurement within 4.75 – 5.25 V?
YES
NO
DTC 140-2 (ECT SENSOR 2 VOLTAGE IS TOO HIGH)
• When the DTC code 6-2, 7-2, 10-2, 22-2, 140-2, and
141-2 are indicated at the same time, the ground line
(SG2) is open.
1. Symptom reproduction test
Turn the combination switch OFF.
Disconnect the ECT sensor 2 (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 ECT sensor 2 voltage using the Dr.H.
Is the measurement within 0.08 – 4.92 V?
YES
NO
2. ECT sensor 2 signal/GND line open circuit
inspection
Turn the combination switch OFF and disconnect
the ECT sensor 2 (2P) connector
Turn the combination switch ON.
Measure the voltage between the ECT sensor 2
(2P) connector
(Red/Black) terminal and No.2 (Green) terminal.
Is the measurement within 4.75 – 5.25 V?
YES
NO
5-40
main wire harness side No.1
– Replace the ECT sensor 2 with a new one
and recheck.
– Repair short in the main wire harness
between the ECT sensor 2. If the main
wire is correct, replace the ECM with a
new one and recheck.
, ECM connector B
, and then reconnect
– Temporary failure (code
reappear)
– GO TO STEP 2.
main wire harness side No.1
– Replace the ECT sensor 2 with a new one
and recheck.
– Repair open in the Red/Black wire or
Green wire. If the main wire harness is
normal, replace the ECM with a new one
and recheck.
ECT SENSOR 2 (2P) CONNECTOR
.
MAIN WIRE HARNESS SIDE
,
,
does not
.
ECT SENSOR 2 (2P) CONNECTOR
MAIN WIRE HARNESS SIDE
SG2
(Green)
TOH1
(Red/Black)
TOH1
(Red/Black)