TOHATSU BFT250A Service Manual page 143

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DTC 1-4 (ABNORMAL HO2S)
ECM
1. Symptom reproduction test
Turn the combination switch OFF.
Disconnect the HO2S 4P connector
connector A
connector 1
Clear the DTC (page 5-6).
• Continue the procedure if the DTC does not
Start the engine and let it run at 3,000 min
5 minutes or more under no load.
Let the engine idle for 1 minute or more.
Check the DTC using the HDS.
Does the DTC 1-4 appear?
YES
NO
2. HO2S inspection
Turn the combination switch OFF and disconnect
the HO2S 4P connector
Inspect the HO2S (page 5-126).
Is the HO2S correct?
YES
NO
O2 Bl/Y
SG2 G
, ECM connector B
and then reconnect them.
clear.
– GO TO STEP 2.
– Temporary failure
reappear).
.
– GO TO STEP 3.
– Replace the HO2S with a new one and
recheck.
Bl/Y
G
3 7
JOINT
CONNECTOR 1
, ECM
, joint
-1 (rpm) for
(code does not
FUEL SYSTEM
HO2S
Bl
Gr
Bl: Black Br: Brown
Y: Yellow O: Orange
Bu: Blue Lb: Light blue
G: Green Lg: Light green
R: Red
P: Pink
W: White Gr: Gray
5-21