TOHATSU BFT 250A, Service Manual

Page: 159 / 639

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FUEL SYSTEM
3. Knock sensor inspection
Replace the knock sensor with a new one and
perform the knock sensor symptom reproduction
test.
Does the DTC 23-1 appear?
YES – Replace the ECM with a new one and
recheck.
NO – Faulty original knock sensor. End of
inspection.
DTC 41-2 (ABNORMAL HO2S HEATER)
1. Symptom reproduction test
Turn the combination switch OFF.
Disconnect the HO2S 4P connector
, ECM
connector A , junction box 23P connector
and then reconnect them.
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 -1 (rpm) for
5 minutes or more under no load.
Let the engine idle for a minute or more.
Check the DTC using the HDS.
Does the DTC 41-2 appear?
YES – GO TO STEP 2.
NO – Temporary failure (code does not
reappear).
Bl: Black
Y: Yellow
Bu: Blue
G: Green
R: Red
W: White Br: Brown
O: Orange
Lb: Light blue
Lg: Light green
P: Pink
Gr: Gray
ECM
HO2S
HEATER
W/Bl
18
O2HT
10
W/Bl
Y/Bl
Y/Bl
No.10
FUSE
(10 A)
W
W
FUSE/RELAY JUNCTION BOX