01 - Vehicle self-diagnosis
1 Vehicle self-diagnosis
Note
The engine control unit -J623- must be coded when the engine
is commissioned for the first time.
Features of vehicle self-diagnosis ⇒ Page 22.
Technical data of vehicle self-diagnosis ⇒ Page 22.
Connect vehicle diagnosis, testing and information system and
select Engine control unit ⇒ Page 23.
Connect test box to check lines ⇒ Page 24.
1.1 Features of vehicle self-diagnosis
The engine control unit -J623- is equipped with a event memo-
ry.
If faults occur in the sensors and components being monitored,
they will be stored in the event memory together with an indica-
tion of the type of fault.
After evaluating the information, the engine control unit decides
between different fault codes (see "Fault table" ⇒ Page 28)
and stores the matching fault code until the event memory is
cleared.
Faults which occur only temporarily (sporadically), are displayed
with the addendum “sporadic fault” “/SP”. The cause of sporadic
faults can be, for example, a loose contact or a brief open cir-
cuit. If a sporadic fault does not occur again within 50 engine
starts, it will be cleared from the event memory.
If faults affecting the operation of the engine have been detec-
ted, the glow plug indicator lamp -K29- and/or the exhaust
emissions warning lamp -K83- light up.
The faults stored can be read using the vehicle diagnosis, test-
ing and information system -VAS 5051/B- ⇒ Page 23.
The event memory must be cleared after the faults have been
rectified.
Note
For general information on the vehicle self-diagnosis refer to the
operating manual for the vehicle diagnosis, testing and informa-
tion system -VAS 5051/B-.
1.2 Technical data of vehicle self-diagnosis
1.2.1 Read version of engine control unit
Connect the vehicle diagnosis, testing and information system
-VAS 5051/B-, and select the vehicle system “001-Engine elec-
3
Industriemotoren - Industrial Engines 2009 ▶
Workshop Manual for Diesel Engine (2.0 l/36-75 kW_EA 189) 05.2015
22
Repair Group 01 - Vehicle self-diagnosis
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