TOHATSU BFT250A Service Manual page 144

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FUEL SYSTEM
3. Fuel supply system inspection
Measure the fuel pressure (page 5-110).
Is the fuel pressure normal?
YES
NO
DTC 3-1, 3-2 (MAP SENSOR VOLTAGE TOO LOW OR TOO HIGH)
ECM
5 V
PB
5 V
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 5-6).
• Continue the procedure if the DTC does not
clear.
Turn the combination switch ON.
Measure the MAP sensor voltage using the HDS.
Is the measurement within 0.23 – 4.49 V?
YES
NO
5-22
– 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
– Temporary failure (code
reappear).
– GO TO STEP 2.
Br/Y
W/R
,
does not
MAP
SENSOR
G
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