TOHATSU BFT250A Service Manual page 172

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FUEL SYSTEM
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
3. Fuel supply system inspection
Turn the combination switch OFF.
Measure the fuel pressure (page 5-110).
Is the fuel pressure normal?
YES
NO
MIL BLINKS 3 TIMES (MAP SENSOR)
ECM
5 V
PB
5 V
VCC1
SG1
1. Symptom reproduction test
Turn the combination switch OFF.
Disconnect the MAP sensor 3P connector
ECM connector A
and then reconnect them.
Reset the ECM (page 5-6).
Turn the combination switch ON and check the
number of blinks of the MIL.
Does the MIL blink 3 times?
YES
NO
5-50
.
– GO TO STEP 3.
– Replace the HO2S with a new one and
recheck.
– Repair open or short in the main wire
harness between the ECM and HO2S. If
the main wire harness is correct, replace
the ECM with a new one, and recheck.
– Repair fuel supply system and recheck
under normal fuel pressure.
W/R
Br/Y
G
, ECM connector B
– GO TO STEP 2.
– Temporary failure (code
reappear).
Br/Y
W/R
G
,
does not
MAP
SENSOR
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