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2010 Mercedes Benz C 300 (204.054) V6-3.0L (272.947) Page 2755


End of test



1.3.3. Test with the aid of the measuring system



Test sequence



- Measurement of level voltage of engine CAN buses CAN bus High and CAN bus Low with the universal oscilloscope



- Separating one user from the connector strip X63/4 (CAN databus adapter connector, 2-pin)



- Observe level voltage.



- Plug in connector again at connector strip X63/4 (CAN databus adapter connector, 2-pin).



- Repeat this procedure for all CAN users.



Specified value



- As soon as the faulty branch was disconnected, the current image of the level voltage changes.



Possible cause of fault in the faulty branch



- X63/4 (CAN databus adapter connector, 2-pin)



- Test connectors and wiring for CAN of engine compartment CAN control modules.



- Control unit



Communication with ECU required ( Measuring system )



2. Check the CAN communication with control unit N93 (Central gateway control unit).



Warning!Communication with ECU required.



3. Check the CAN communication with control unit N73 (EIS [EZS] control unit).



Warning!Communication with ECU required.



4. Drive train CAN test



Warning!Communication with ECU required.



5. Interior CAN check



Warning!Communication with ECU required.



Part 1



No CAN message was received from control unit A1 (Instrument cluster).



Possible cause:



- Check the CAN communication with control unit A1 (Instrument cluster).



- Central CAN bus



Affected functions:



- CAN Communication



- Automatic transmission Function



-------------------------------------------------



Test 1: Engine compartment CAN test



Test 2: Check the CAN communication with control unit A1 (Instrument cluster).



Test 3: Central CAN test



1. Engine compartment CAN test



Test 1.1: Procedure in case of CAN faults



Test 1.2: Evaluation of CAN fault codes



Test 1.3: Further CAN test options



1.1. Procedure in case of CAN faults



Test 1.1.1: How do I quickly reach my goal?

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