TOHATSU BFT75A Service Manual page 205

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FUEL SYSTEM
2. ECT sensor 2 signal line open or short circuit/
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
MIL BLINKS 25 (2 LONG BLINKS AND 5 SHORT BLINKS)
ECT SENSOR 3
ECM
5V
TOH2
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
• When the MIL blinks 6, 7, 10, 22, 24, and 25 at the
same time, the ground line (SG2) is open.
1. Symptom reproduction test
Turn the combination switch OFF.
Disconnect the ECT sensor 3 (2P) connector
ECM connector A
and joint connector 2
them.
Clear the DTC (page 5-5).
Turn the combination switch OFF and connect the
SCS service check connector.
Turn the combination switch ON and check the
number of blinks of the MIL.
Does the MIL blink 25?
YES
NO
5-64
main wire harness side No.1
– Replace the ECT sensor 2 with a new one
and recheck.
– Repair open or short in the Red/Black wire
or open in the Green wire. If the main wire
harness is normal, replace the ECM with a
new one and recheck.
29
R
G
28
12
JOINT CONNECTOR 2
, ECM connector B
, and then reconnect
– GO TO STEP 2.
– Temporary failure (code
reappear)
.
ECT SENSOR 2 (2P) CONNECTOR
MAIN WIRE HARNESS SIDE
SG2
(Green)
G
G
G G
21
22
,
,
does not
TOH1
(Red/Black)
ECT
SENSOR 3
18