TOHATSU BFT115A Service Manual page 167

DTC 141-1, 141-2 (ECT SENSOR 3 VOLTAGE IS TOO LOW OR TOO HIGH)
ECM
12
5V
TOH2
SG2
13
DTC 141-1 (ECT SENSOR 3 VOLTAGE IS TOO LOW)
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).
• Continue the procedure if the DTC does not
clear.
Turn the combination switch ON.
Measure the ECT sensor 3 voltage using the HDS.
Is the measurement within 0.08 – 4.92 V?
YES – Temporary
reappear)
NO – GO TO STEP 2.
2. ECT sensor 3 signal line short 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 engine ground.
Is the measurement within 4.75 – 5.25 V?
YES – Replace ECT sensor 3 with a new one and
recheck.
NO – Repair short in the Red wire. If the main
wire harness is normal, replace the ECM
with a new one and recheck.
R
G/R
G/R
28
21
JOINT
CONNECTOR 2
, ECM connector B
12
, and then reconnect
28
failure (code does
.
8
main wire harness side No.1
8
R
G/R
G/R
22
Bl Black
Y Yellow
Bu Blue
G Green
R Red
W White
,
8
,
13
not
ECT SENSOR 3 (2P) CONNECTOR
MAIN WIRE HARNESS SIDE
8
FUEL SYSTEM
ECT SENSOR 3
8
Br Brown
O Orange
Lb Light blue
Lg
Light green
P Pink
Gr Gray
TOH2
(Red)
5-49