Volkswagen CJDA Workshop Manual page 434

3
Industriemotoren - Industrial Engines 2009 ▶
Workshop Manual for Diesel Engine (2.0 l/36-75 kW_EA 189) 05.2015
– Check terminal 30 voltage supply relay -J317-
current flow diagrams.
– Check cable connections for open circuit, short circuit and
transfer resistance at contacts referring to current flow dia-
gram.
If no fault is found in wiring and relay:
– Renew engine control unit -J623-
3.2 Renewing engine control unit
Procedure
– First, check identification and coding of previous engine con-
trol unit as follows:
– Connect vehicle diagnostic tester, and select "Engine elec-
⇒ P age 23
tronics 01".
The identification and coding of the engine control unit are
shown on the display.
– Note coding.
– Compare control unit identification with new control unit.
– Read loading of diesel particulate filter
diesel particulate filter.
Note engine code.
– Read injector delivery calibration values/injector voltage cali-
⇒ " Reading injector delivery calibration val-
bration values
ues/injector voltage calibration values, and storing them in
engine control unit" on page
– To verify whether the correct injectors are installed, note in-
jector delivery calibration codes (IMA) and compare them to
the codes printed on the injectors.
– Release the tow connectors on engine control unit -J623-,
and pull them off.
– Remove engine control unit, and install new engine control
unit.
– Install connectors of engine control unit, and lock them.
After the new engine control unit has been installed:
– Connect vehicle diagnostic tester, and select "Engine elec-
⇒ P age
tronics 01" 23.
– Code engine control unit -J623- using code which has been
read and noted beforehand.
– To do this, select diagnosis function 007 in vehicle diagnostic
tester.
– Enter coding, and confirm with "Q".
– Switch ignition off and on again. The coding will be applied
only after having switched the ignition off and on again.
418 Repair Group 23 - Mixture preparation - injection
⇒ P age
⇒ P age
418.
⇒ P age
454. Check
421.
486,