TOHATSU BFT75A Service Manual page 204

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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
Is the knock sensor line open or short?
YES
NO
MIL BLINKS 24 (2 LONG BLINKS AND 4 SHORT BLINKS)
ECT SENSOR 2
ECM
5V
TOH1
SG2
Br
Bl BLACK BROWN
Y YELLOW O ORANGE
Bu BLUE Lb LIGHT BLUE
G GREEN Lg LIGHT GREEN
R RED P PINK
W WHITE Gr GRAY
• When the MIL blinks 6, 7, 10, 22, 24, and 25 at the
same time, the ground line (SG2) is open.
1. Symptom reproduction test
Turn the combination switch OFF.
Disconnect the ECT sensor 2 (2P) connector
ECM connector A
and joint connector 2
them.
Clear the DTC (page 5-5).
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 24?
YES
NO
.
main wire harness side
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.
29
R/Bl
G
28
, ECM connector B
, and then reconnect
– GO TO STEP 2.
– Temporary failure (code
reappear)
G G
21
19
12
JOINT CONNECTOR 2
,
,
does not
FUEL SYSTEM
ECT
SENSOR 2
17
R/Bl
G
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