Engines / Petrol / ME 7.5 general / Test - knock sensor - signal

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Mark	Model	Control unit	Diagnostic operation

Mark

Select a vehicle make or a common group such as Service Intervals, Engines, Transmissions, Immobilizers and Independent Heaters.

Model

Control unit Select the desired control unit as accurately as possible. The UDS identifier EV_xyz can be found in the VCDS after connecting to the control unit and then in the Extended Identification.

Select the desired control unit as accurately as possible. The UDS identifier EV_xyz can be found in the VCDS after connecting to the control unit and then in the Extended Identification.

Diagnostic operation Select the desired diagnostic procedure.

Diagnostic procedure

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Conditions:
- knock sensor - tightening torque = XX Nm
- engine speed = idling
- engine temperature > XX °C

connect with the control unit XX - engine

XX - Measured values group XXX
required values
field X = X,XV - X,XV (knock sensor - voltage - cylinder X)
field X = X,XV - X,XV (knock sensor - voltage - cylinder X)
field X = X,XV - X,XV (knock sensor - voltage - cylinder X)
field X = X,XV - X,XV (knock sensor - voltage - cylinder X)

increase rpm to XXXX rpm

required values - field X - X = increases by X,XV

XX - end of communication

upon non--achievement of condition - check component:
- knock sensor
- knock sensor - line
- knock sensor - tightening torque - required value = XX Nm

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