TOHATSU BFT115A Service Manual page 158

FUEL SYSTEM
DTC 41-3, 41-4 (ABNORMAL A/F SENSOR HEATER CURRENT)
ECM
LAFR
AFHT+
AFHT
AFC
AFV
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
DTC 41-3 (ABNORMAL A/F SENSOR HEATER HIGH
CURRENT OR LOW CURRENT)
1. Symptom reproduction test
Turn the combination switch OFF.
Disconnect the A/F sensor 4P connector
fuse/relay junction box 23P connector
relay junction box 10P connector
connector A
Clear the DTC (page 5-6).
• Continue the procedure if the DTC does not
clear.
Start the engine and let it run at 3,000 min
5 minutes or more under no load until the engine
temperature is over 85 °C (185 °F).
Check the DTC using the HDS.
Does the DTC 41-3 appear?
YES
NO
5-40
12
G/Y
No. 3
FUSE
W
(30 A)
Bl/W
A/F
BI/Y
SENSOR
HEATER
RELAY
3 7
17
W W
W/BI
W
W/BI Bl/Y Bl/W
3
2 1 3 4
W Bu Bl Bl
A/F SENSOR
HEATER
, and then reconnect them.
12
– GO TO STEP 2.
– Temporary failure (code
reappear)
FUSE/RELAY JUNCTION BOX
No. 4
FUSE
(30 A)
MAIN
RELAY
6 9
16 16
G/Y Bl
Bl Bl
W/Bl
2
29
6
7
1
JOINT
CONNECTOR 1
GND3
,
3
, fuse/
16
, and ECM
17
-1 (rpm) for
does not
No. 5
FUSE
(10 A)
4 4 T5
15
Bl/Y W/Bl Bl
BATTERY
Bl/Y
GND1
2
BAT W/Bl
LOAD
Bl/Y
COMBINATION SWITCH
Bl/Y
W/Bl
OPTION