TOHATSU BFT75A Service Manual page 178

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3. EOP sensor signal/GND line open circuit
inspection
Measure the voltage between the EOP sensor 3P
connector
(Yellow/Red) terminal and No.3 (Green) terminal.
Is the measurement within 4.75 – 5.25 V?
YES
NO
DTC 23-1 (KNOCK SENSOR NO PULSE)
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
1. Symptom reproduction test
Turn the combination switch OFF.
Disconnect the knock sensor 1P connector
and ECM connector B
them.
Clear the DTC (page 5-5).
• Continue the procedure if the DTC does not
clear.
Start the engine and let it run at 5,000 min
7 minutes under no load.
Increase the engine speed gradually and run it at
3,000 min
Recheck the DTC with the Dr.H.
Does the DTC 23-1 appear?
YES
NO
main wire harness side No.2
– Replace the EOP sensor with a new one
and recheck.
– • Repair open or short in the Yellow/Red
wire.
• Repair open in the Green wire.
• If the main wire harness is normal,
replace the ECM with a new one, and
recheck.
ECM
KS R/Bu
28
, and then reconnect
-1 (rpm) for 10 seconds.
– GO TO STEP 2.
– Temporary failure (code
reappear)
EOP SENSOR 3P CONNECTOR
MAIN WIRE HARNESS SIDE
SG2
(Green)
KNOCK
SENSOR
10
R/Bu
-1
(rpm) for
does not
FUEL SYSTEM
POIL
(Yellow/Red)
5-37