TOHATSU BFT75A Service Manual page 206

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2. ECT sensor 3 signal line open or short circuit/
GND line open circuit inspection
Turn the combination switch OFF and disconnect
the ECT sensor 3 (2P) connector
Turn the combination switch ON.
Measure the voltage between the ECT sensor 3
(2P) connector
(Red) terminal and No.2 (Green) terminal.
Is the measurement within 4.75 – 5.25 V?
YES
NO
MIL BLINKS 41 (4 LONG BLINKS AND ONE SHORT BLINK)
HO2S HEATER
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
1. Symptom reproduction test
Turn the combination switch OFF.
Disconnect the HO2S 4P connector
connector
then reconnect them.
Clear the DTC (page 5-5).
Start the engine and let it run at 3,000 min
5 minutes or more under no load.
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 41?
YES
NO
main wire harness side No.1
– Replace the ECT sensor 3 with a new one
and recheck.
– Repair open or short in the Red wire or
open in the Green wire. If the main wire
harness is normal, replace the ECM with a
new one and recheck.
No.4
FUSE
(10 A)
13
16
ECM
JOINT
29
CONNECTOR 1
O2HT W/Bl
, and joint connector 1
– GO TO STEP 2.
– Temporary failure (code
reappear)
. ECT SENSOR 3 (2P) CONNECTOR
MAIN WIRE HARNESS SIDE
SG2
(Green)
Y
17
25
W/Bl
Y/Bl
, ECM A
, and
-1 (rpm) for
does not
FUEL SYSTEM
TOH2
(Red)
HO2S
HEATER
W
W
5-65