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2010 Mercedes Benz C 300 (204.054) V6-3.0L (272.947) Page 1995


Specified value



- Resistor[115...125]ohms



Question



- Is the measurement value OK?



YES



The measurement value is OK.End of test



NO



The measurement value is not OK.Possible cause and remedy



- Control unit N3/10 (ME-SFI [ME] control unit)



End of test



1.1.3.3. 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 X30/5 (Left voltage distributor (CAN) connector)



- Observe level voltage.



- Plug in connector again at connector strip X30/5 (Left voltage distributor (CAN) connector).



- 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



- X30/5 (Left voltage distributor (CAN) connector)



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



- Control unit



Communication with ECU required ( Measuring system )



1.1.3.4. Display CAN signals with the aid of the special tool 'Star Diagnosis CANtool'.



Important notes



- When CAN diagnosis is finished, the 8-pin CAN cable must be replaced with the diagnostic cable.



- Before values are read out from a control unit, the control unit must be reinitialized.



Continue with button F2



Test 1.1.3.4.1: Actual values via CAN ( Engine CAN bus )



1.1.3.4.1. Actual values via CAN ( Engine CAN bus )



Note



- The actual values shown on the following screens are only displayed and updated as long as the CAN bus is active.



Continue with button F2



Test 1.1.3.4.1.1: Function-specific actual values :



Test 1.1.3.4.1.2: Cruise control



Test 1.1.3.4.1.3: Drive authorization



Test 1.1.3.4.1.4: Control unit-specific actual values :



Test 1.1.3.4.1.5: Electronic selector module



Test 1.1.3.4.1.6: Transmission control



Test 1.1.3.4.1.7: Motor electronics



Test 1.1.3.4.1.8: Steering column module



1.1.3.4.1.1. Function-specific actual values :



1.1.3.4.1.1. No further information available.

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