TOHATSU 200 Series Service Manual page 79

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DTC 23-1 (ABNORMAL OUTPUT OF
KNOCK SENSOR)
1. Symptom reproduction test
Turn the combination switch OFF.
Disconnect the knock sensor 1P connector
ECM connector B
Clear the DTC (page 5-2).
• Continue the procedure if the DTC does not
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).
Lower the engine speed gradually and run it at
3,000 – 4,000 min
Recheck the DTC with the HDS.
Does the DTC 23-1 appear?
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 the open and short in wire between the
Knock sensor and ECM.
Is the knock sensor line correct?
YES
NO
3. Knock sensor inspection
Replace the knock sensor with a new one and
perform the knock sensor symptom reproduction
test.
Does the DTC 23-1 appear?
YES
NO
, switch wire 6P connector
and then reconnect them.
clear.
-1 (rpm) for 10 seconds.
– GO TO STEP 2.
– Temporary failure
reappear).
.
– 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.
,
-1 (rpm) for
(code does not
FUEL SYSTEM
5-23