TOHATSU BFT115A Service Manual page 188

FUEL SYSTEM
MIL BLINKS 23 (2 LONG BLINKS AND 3 SHORT BLINKS)
KNOCK SENSOR
ECM
1. Symptom reproduction test
Turn the combination switch OFF.
Disconnect the knock sensor 1P connector
and ECM connector B
them.
Clear the DTC (page 5-6).
Start the engine and let it run at 3,000 min
5 minutes or more under no load until the engine
temperature is over 85 °C (185 °F).
Increase the engine speed gradually and run it at
3,000 – 4,000 min
Turn the combination switch OFF and connect the
SCS service check connector.
Turn the combination switch ON and check the
number of blinks of the MIL.
Does the MIL blink 23?
YES
NO
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 open and short circuit between the knock
sensor 1P connector
No.1 (Red/Blue) terminal and ECM connector B
13
Is the knock sensor line open or short?
YES
NO
5-70
KS R/Bu
13
, and then reconnect
13
-1 (rpm) for 10 seconds.
– GO TO STEP 2.
– Temporary failure (code
reappear)
.
13
main wire harness side
40
No.29 (Red/Blue) terminal.
– Repair open or short in the Red/Blue wire.
– Replace the knock sensor with a new one
and recheck. If the knock sensor is
replaced, but MIL blinks 23, replace the
ECM with a new one and recheck.
KNOCK
SENSOR
40
R/Bu
Bl Black Br Brown
Y Yellow O Orange
Bu Blue Lb Light blue
Lg
G Green Light green
R Red P Pink
W White Gr Gray
40
-1 (rpm) for
does not
40