TOHATSU BFT115A Service Manual page 190

FUEL SYSTEM
MIL BLINKS 25 (2 LONG BLINKS AND 5 SHORT BLINKS)
ECT SENSOR 3
ECM
5V
TOH2
SG2
• When the MIL blinks 6, 7, 10, 22, 24, 25, and 27 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 5-6).
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
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/Red) terminal.
Is the measurement within 4.75 – 5.25 V?
YES
NO
5-72
12
R
G/R
13
JOINT
CONNECTOR 2
, ECM connector B
12
, and then reconnect
28
– GO TO STEP 2.
– Temporary failure (code
reappear)
main wire harness side No.1
8
– Replace the ECT sensor 3 with a new one
and recheck.
– Repair open or short in the Red wire or
open in the Green/Red wire. If the main
wire harness is normal, replace the ECM
with a new one and recheck.
G/R G/R
28
21
22
,
8
,
13
does not
. ECT SENSOR 3 (2P) CONNECTOR
8
MAIN WIRE HARNESS SIDE
SG2
(Green/Red)
ECT SENSOR 3
8
R
G/R
Bl Black Br Brown
Y Yellow O Orange
Bu Blue Lb Light blue
Lg
G Green Light green
R Red P Pink
W White Gr Gray
8
TOH2
(Red)