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 FAQ #172
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Knock sensor
Knock sensor (1120)

The engine knock information, transmitted by the sensor, enables the ECU to correct the ignition advance (reduction) .

Knock is a vibratory phenomenon due to an exploding combustion of the air/fuel mixture in one of the 4 cylinders .

The sensor transmits voltage peaks to the injection ECU when there is knocking .

After engine knocking information, the ECU reduces the ignition timing, and simultaneously enriches the air-fuel mixture .

Electrical features

Supply : Injection ECU .

Allocation of the connector channels :

Channel 1 : +5 volts supply

Channel 2 : Signal


Location : Cylinder block .
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FAQ Posted by Dave_Retired.
Info Created: 22 September 2009
Last Updated: 22 September 2009