TOHATSU BFT250A Service Manual page 182

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FUEL SYSTEM
2. Knock sensor line open or short circuit
inspection
Turn the combination switch OFF.
Disconnect the knock sensor 1P connector
and ECM connector B
Check for continuity through the Knock sensor wire.
Is the knock sensor line correct?
YES
NO
3. Knock sensor inspection
Replace the knock sensor with a new one and
connect the knock sensor 1P connector
Turn the combination switch ON and check the
number of blinks of the MIL.
Does the MIL blinks 23 times?
YES
NO
MIL BLINKS 24 TIMES (2 LONG BLINKS AND 4 SHORT BLINKS) EMT
SENSOR 1
ECM
5 V
TOH1
SG2
1. Symptom reproduction test
Turn the combination switch OFF.
Disconnect the EMT sensor 1 2P connector
ECM connector A
joint connector 1
Reset the ECM (page 5-6).
Turn the combination switch ON and check the
number of blinks of the MIL.
Does the MIL blink 24 times?
YES
NO
5-60
.
– GO TO STEP 3.
– Repair open or short in the main wire
harness between the ECM and knock
sensor.
– Replace the ECM with a new one and
recheck.
– Faulty original knock sensor. End of
inspection.
R/Bl
G
, ECM connector B
and then reconnect them.
– GO TO STEP 2.
– Temporary failure (code
reappear).
.
3 9
JOINT CONNECTOR 1
,
,
does not
EMT SENSOR 1
R/Bl
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