Volkswagen CJDA Workshop Manual page 440

3
Industriemotoren - Industrial Engines 2009 ▶
Workshop Manual for Diesel Engine (2.0 l/36-75 kW_EA 189) 05.2015
● 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 field.
Keyboard
– Using the on-screen keyboard, enter the value 1.
– Press button.
←
– Press button to reset the learnt value.
Confirm
– Then, read event memory of engine control unit, and clear
event memory if necessary
If a fault is stored in the event memory:
– Check throttle valve module -J338-
– Clear event memory
– 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-
⇒ P age
nosis 26, read event memory.
424
Repair Group 23 - Mixture preparation - injection
⇒ P age
26, read event memory.
⇒ P age
414.
⇒ P age
26.