TOHATSU BFT 250A, Service Manual

Page: 150 / 639

5-28
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FUEL SYSTEM
DTC 7-1, 7-2 (TP SENSOR VOLTAGE IS TOO LOW OR TOO HIGH)
DTC 7-1 (TP SENSOR VOLTAGE IS TOO LOW)
1. Symptom reproduction test
Turn the combination switch OFF.
Disconnect the TP sensor 3P connector
,
ECM connector A , ECM connector B ,
joint connector 1 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 TP sensor voltage using the HDS.
Is the measurement within 0.23 – 4.89 V?
YES – Temporary failure (code does not
reappear).
NO – GO TO STEP 2.
2. TP sensor power/signal line open circuit
inspection
Turn the combination switch OFF and disconnect
the TP sensor 3P connector
.
Turn the combination switch ON.
Measure the voltage between the TP sensor 3P
connector
main wire harness side No.3 (Blue)
terminal and No.2 (Red/Black) terminal.
Is the measurement within 4.75 – 5.25 V?
YES – GO TO STEP 3.
NO – • Repair open in the Blue wire between
the ECM and TP sensor
• Repair open in the Red/Black wire
between the ECM and TP sensor
• If the main wire harness is correct,
replace the ECM with a new one, and
recheck
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
R/Bl THL
ECM
TP SENSOR
5 V
7
G
JOINT CONNECTOR 1
1
VCC2
SG2
7
25
Bu
8
G
23
R/Bl
Bu
3
TP SENSOR 3P CONNECTOR
MAIN WIRE HARNESS SIDE
VCC2
(Blue)
THL
(Red/Black)