TOHATSU BFT 250A, Service Manual

Page: 144 / 639

5-22
dummyhead dummyhead
FUEL SYSTEM
3. Fuel supply system inspection
Measure the fuel pressure (page 5-110).
Is the fuel pressure normal?
YES – 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.
NO – Repair fuel supply system and recheck
under normal fuel pressure.
DTC 3-1, 3-2 (MAP SENSOR VOLTAGE TOO LOW OR TOO HIGH)
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 , ECM connector B
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 – Temporary failure (code does not
reappear).
NO – GO TO STEP 2.
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
W/R
Br/Y
PB
VCC1
ECM
MAP
SENSOR
8
1
5 V
Br/Y
G
6
24
SG1
2
3
W/R
G
5 V