Engines / Petrol / ME 7.1.1 general / Test - knock sensor - regulation of advance

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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:
- second mechanic necessary!
- knock sensor - line = OK

- 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 temperature > XX °C
- idling -> partial load -> full load -> deceleration
- full load = engine speed > XXXX rpm

XX - Measured values group XXX
required values
field X = X° (regulation of advance - cylinder X - knock sensor X)
field X = X° (regulation of advance - cylinder X - knock sensor X)
field X = X° (regulation of advance - cylinder X - knock sensor X)
field X = X° (regulation of advance - cylinder X - knock sensor X)

XX - Measured values group XXX
required values
field X = X° (regulation of advance - cylinder X - knock sensor X)
field X = X° (regulation of advance - cylinder X - knock sensor X)

XX - end of communication

if values are not achieved - field X + X + X + X - partial load, full load - check component:
- loose engine parts
- engine
- Fuel (XX oct.)
- knock sensor - line
- knock sensor - tightening torque (XX Nm)
- knock sensor
- knock sensor - connector connections
- cylinder head - height

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