TOHATSU BFT115A Service Manual page 179

MIL BLINKS 6 (ECT SENSOR 1)
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
• 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 1 (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 6?
YES – GO TO STEP 2.
NO – Temporary
reappear)
2. ECT sensor 1 signal line open or short circuit/
GND line open circuit inspection
Turn the combination switch OFF and disconnect
the ECT sensor 1 (2P) connector
Turn the combination switch ON.
Measure the voltage between the ECT sensor 1
(2P) connector
6
(Red/White) terminal
terminal.
Is the measurement within 4.75 – 5.25 V?
YES – Replace the ECT sensor 1 with a new one
and recheck.
NO – Repair open or short in the Red/White wire
or open circuit in the Green/Red wire. If the
main wire harness is normal, replace the
ECM with a new one and recheck.
ECM
5V
12
TE
SG2
13
6
, ECM connector B
12 13
, and then reconnect
28
failure (code does
.
6
main wire harness side No.1
and No.2 (Green/Red)
ECT SENSOR 1
6
R/W R/W
G/R
G/R
G/R
28
21
JOINT
CONNECTOR 2
,
,
not
ECT SENSOR 1 (2P) CONNECTOR
MAIN WIRE HARNESS SIDE
SG2
(Green/Red)
FUEL SYSTEM
G/R
14
6
TE
(Red/White)
5-61