● Earth connections OK
● All electrical consumers must be switched off.
Procedure
– Select diagnosis function “014-Long adaptation”. The ignition
must be switched on for this purpose.
– Select “Channel number 124”:
– Press
Keyboard
field.
– Using the on-screen keyboard, enter the value 1.
– Press
←
button.
– Press
Confirm
button to reset the learnt value.
– Then, read event memory of engine control unit, and clear
, read event memory.
If a fault is stored in the event memory:
– Check throttle valve module -J338-
.
.
– Repeat procedure.
3.8
Checking data bus
Note
The section below provides only general instructions for check-
ing, since due to the various use cases of industrial engines it is
not possible to specify a common procedure.
Function
The engine control unit uses the CAN bus to communicate with
all bus-enabled control units.
These bus-enabled components are connected via twisted pair
data bus wires (CAN_High and CAN_Low) and exchange infor-
mation (messages). Missing information on the data bus is de-
tected and recognised as a fault.
The data bus requires a terminal resistor to function fault-free.
This central terminal resistor is located in the engine control
unit.
Special tools and workshop equipment required
◆
Hand multimeter -V.A.G 1526- or multimeter -V.A.G 1715-
◆
Auxiliary measuring set -V.A.G 1594-
◆
Test box -V.A.G 1598/42- with adapter cable
-V.A.G 1598/39-2-
◆
Current flow diagram
Test prerequisite
● Ignition switched off.
● A fault has been recognised by the CAN data bus self-diag-
, read event memory.
3
Industriemotoren - Industrial Engines 2009
▶
Workshop Manual for Diesel Engine (2.0 l/36-75 kW_EA 189) 05.2015
424
Repair Group 23 - Mixture preparation - injection