Friday, June 25, 2021

2010 Mercedes Benz C 300 (204.054) V6-3.0L (272.947) Page 3068


- 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 )



Part 1



No CAN message was received from control unit Engine management.



Possible cause:



- Fault in CAN communication with control unit Motor electronics.



- Drive train CAN bus



Affected functions:



- CAN Communication



- Automatic transmission Function



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Test 1: Engine compartment CAN test



Test 2: Check the CAN communication with control unit Engine management.



Test 3: Drive train 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?



Test 1.1.2: General test information



Test 1.1.3: General CAN fundamentals



Test 1.1.4: Possible aids and their usage



1.1.1. How do I quickly reach my goal?



How do I quickly reach my goal?First call up menu item 'Evaluation of CAN fault codes' in case of CAN timeout fault codes and communication



errors.The resulting tests must be performed.Menu item 'Further CAN test options' should only be called up if the above-specified tests do not



produce the desired result.Note:Menu item 'General test information' can be called up for an explanation of the different CAN fault types.



1.1.2. General test information



Notes on CAN fault codes:CAN timeout fault



- A CAN timeout fault code is set due to the absence of a CAN input signal.The cause of this may be not only the transmitter control unit, but



also the CAN networking.



- For example:No CAN message was received from control unit A.



Bus OFF fault



- A Bus OFF fault code is set, when the control unit cannot send a certain amount of messages to the CAN bus or the messages are



incomplete.The control unit then switches off for a short time from CAN bus.



- For example:CAN controller: CAN bus OFF



Functional CAN fault



- A functional CAN fault code is set because of an implausible CAN input signal.The cause of this is not the CAN networking, but the



transmitter control unit or its sensors.



- For example:CAN signal 'A' from control unit B is implausible.



Notes on CAN faults that cannot be read out as fault codes.Bus wake-up event



- An event that wakes up the bus without reason is designated a bus wake-up event.

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