TOHATSU BFT250A Service Manual page 146

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FUEL SYSTEM
3. MAP sensor signal/GND line open circuit
inspection
Measure the voltage between the MAP sensor 3P
connector
(White/Red) terminal and No.3 (Green) terminal.
Is the measurement within 4.75 – 5.25 V?
YES
NO
DTC 4-1, 4-2 (NO CKP SENSOR PULSE OR ABNORMAL CKP SENSOR
PULSE)
ECM
CRKP
CRKM
DTC 4-1 (NO CKP SENSOR PULSE)
1. Symptom reproduction test
Turn the combination switch OFF.
Disconnect the CKP sensor 2P connector
ECM connector A
Clear the DTC (page 5-6).
• Continue the procedure if the DTC does not
clear.
Start the engine and check the DTC using the HDS.
Does the DTC 4-1 appear?
YES
NO
5-24
main wire harness side No.2
– Replace the MAP sensor with a new one
and recheck.
– • Repair open in the White/Red wire
between the ECM and MAP sensor.
• Repair open in the Green wire between
the ECM and MAP sensor.
• If the main wire harness is correct,
replace the ECM with a new one, and
recheck
Bu
W
and then reconnect them.
– GO TO STEP 2.
– Temporary failure (code
reappear).
MAP SENSOR 3P CONNECTOR
MAIN WIRE HARNESS SIDE
SG1
(Green)
Bu
W
Bl: Black
Y: Yellow
Bu: Blue
G: Green
R: Red
W: White
,
does not
PB
(White/Red)
CKP
SENSOR
Bu
W
Br: Brown
O: Orange
Lb: Light blue
Lg: Light green
P: Pink
Gr: Gray