Engines / UDS Engines by part number / 01 - Engine [EV_ECM20TDI01104L906021BH 002009] / Test - exhaust recirculation CUUx

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Mark	Model	Control unit	Diagnostic operation

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

Model

Part 1 of the order number Select the first three characters of the order number of the engine control unit. This number can be found in the VCDS when linked to the uniform in the SW order number field. Do not insert the ordering number from the control unit packaging here!!!

Select the first three characters of the order number of the engine control unit. This number can be found in the VCDS when linked to the uniform in the SW order number field. Do not insert the ordering number from the control unit packaging here!!!

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:
- ignition = ON
- engine speed = idling
- intake system - tightness = OK

connect with the control unit XX - engine

XX - Security access

enter value: XXXXX

Start

XX - Basic settings

select item in menu: IDEXXXXX - Test - exhaust recirculation

mechanical gearbox: depress and hold: clutch pedal
automatic transmission: depress and hold: brake pedal

activate default settings

follow the diagnostics instructions

desired condition: open / closed

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

IDEXXXXX - exhaust gas return valve X- actual value
IDEXXXXX - Intake air mass sensor X

Monitor the difference in the values during active and inactive regulation IDEXXXXX

required values:

IDEXXXXX = active (>XX%) / inactive
IDEXXXXX - differential pressure - active / inactive > XXX mh/stroke

upon non--achievement of condition - check component:
- exhaust gas return valve
- wiring
- execute function: basic settings - Low-pressure exhaust gas return valve

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