Engines / Diesel / EDC 17 UDS general / Measurement of compression pressure

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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:
- engine temperature > XX °C
- connect battery charger

connect with the control unit XX - engine

XX - Basic settings

select item in drop-down menu: IDEXXXXX - Measurement of compression pressure X

Start

In the Basic Settings window, click Measured values and select the items you want to visualize.

IDEXXXXX - Measurement of compression pressure X
IDEXXXXX - Measurement of compression pressure X
IDEXXXXX - Measurement of compression pressure X
IDEXXXXX - Measurement of compression pressure X

TIP! For easier search in the menu, enter the code IDE, ENG or MAS into the "Filter" window

manual gearbox:
depress and hold: brake pedal + clutch pedal

automatic transmission:
depress and hold: brake pedal + accelerator pedal

starter XXs (engine does not Start)

observe values:

IDEXXXXX - Measurement of compression pressure X
IDEXXXXX - Measurement of compression pressure X
IDEXXXXX - Measurement of compression pressure X
IDEXXXXX - Measurement of compression pressure X

record values measured in fields X - X. Add-up the values for the individual cylinders and divide by X, you thus get the average starting rpm. For example. (XXX+XXX+XXX+XXX)/X = XXX,XX. The values of the individual cylinders must not differ from the average starting rpm by more than X rpm. To increase precision, it is possible to repeat the test.

End of test

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