TOHATSU BFT75A Service Manual page 161

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FUEL SYSTEM
2. HO2S inspection
Turn the combination switch OFF and disconnect
the HO2S 4P connector
Inspect the HO2S (page 5-108).
Is the HO2S correct?
YES
NO
3. Fuel supply system inspection
Measure the fuel pressure (page 5-97).
Is the fuel pressure normal?
YES
NO
DTC 3-1, 3-2 (MAP SENSOR VOLTAGE TOO LOW OR TOO HIGH)
ECM
5V
5V
VCC1
SG1
DTC 3-1 (MAP SENSOR VOLTAGE IS TOO LOW)
1. Symptom reproduction test
Turn the combination switch OFF.
Disconnect the MAP sensor 3P connector
ECM connector A
and then reconnect them.
Clear the DTC (page 5-5).
• Continue the procedure if the DTC does not
clear.
Turn the combination switch ON.
Measure the MAP sensor voltage using the Dr.H.
Is the measurement within 0.23 – 4.49 V?
YES
NO
5-20
.
– 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.
29
PB W/R
Br/Y
G
28
, ECM connector B
– Temporary failure (code
reappear).
– GO TO STEP 2.
Br/Y
W/R
G
,
does not
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
MAP
SENSOR
26