TOHATSU BFT 250A, Service Manual

Page: 186 / 639

5-64
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FUEL SYSTEM
MIL BLINKS 41 TIMES (4 LONG BLINKS AND ONE SHORT BLINK) 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.
Reset the ECM (page 5-6).
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.
Turn the combination switch OFF and connect the
SCS service connector.
Turn the combination switch ON and check the
number of blinks of the MIL.
Does the MIL blink 41 times?
YES – GO TO STEP 2.
NO – Temporary failure (code does not
reappear).
2. HO2S heater inspection
Turn the combination switch OFF.
Inspect the HO2S heater (page 5-126).
Is the HO2S heater correct?
YES – Repair open in the main wire harness
between the No.3 fuse and the HO2S or
between the HO2S and ECM. If the main
wire harness is correct, replace the ECM
with a new one and recheck.
NO – Replace the HO2S with a new one and
recheck.
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
43
FUSE/RELAY JUNCTION BOX