● All electrical consumers must be switched off.
● Earth connections OK
Procedure
– Connect connector of diagnostic cable -VAS 5051B/1- or re-
mote head to diagnostic connection.
– Depending on the function required, do the following:
◆ Switch on ignition, or
◆ start engine; available diagnosis functions.
Note
◆ If the display remains blank, check the voltage supply for the
diagnostic connector using the current flow diagram.
◆ If the display is not as shown in the procedure, refer to the
⇒
Operating manual for the vehicle diagnosis system.
Select operating mode
– Press button on display for “Vehicle self-diagnosis”.
Select vehicle system
– Press “01 - Engine electronics” button on display.
The identification and coding of the engine control unit are
shown on the display.
If the coding does not match:
– Check control unit coding.
Select diagnostic function
All the available diagnosis functions are shown on the display.
– Press key on display for the desired function.
Note
For the function “011-Measured values”, the display zones are
listed from top to bottom.
Available functions when using the vehicle diagnosis, testing
and information system.
1.4 Connecting test box to check lines
Note
◆ The adapter cables -V.A.G 1598/39-1- and
-V.A.G 1598/39-2- are used in conjunction with the test box
-V.A.G 1598/42- to check the lines between the relevant
components and the engine control unit.
◆ The contacts on the engine control unit are distributed over
two different wiring harnesses.
◆ Depending on the component to be checked, the test is per-
formed on the wiring harness with a 60-pin connector or with
a 94-pin connector.
3
Industriemotoren - Industrial Engines 2009 ▶
Workshop Manual for Diesel Engine (2.0 l/36-75 kW_EA 189) 05.2015
24
Repair Group 01 - Vehicle self-diagnosis
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