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

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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 - line = OK
- second mechanic necessary
- observe the occupation safety rules when taking a test drive with connected diagnostics tester

Start the engine - engine speed = idling

connect with the control unit XX - engine

do a test drive

Conditions:
- engine speed > XXXX rpm
- load > XX %

XX - Basic settings group XXX
activate default settings

required values
field X > XXXX rpm (engine speed)
field X > XX % (load)
field X = Syst OK

XX - end of communication

if values are not achieved - field X - check component:
- knock sensor - signal - voltage
- knock sensor - tightening torque - required value = XXNm

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