2010 Mercedes Benz C 300 (204.054) V6-3.0L (272.947) Page 1688

- Resistor[55...65]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

- Line from component N3/10 (ME-SFI [ME] control unit) to component X30/5 (Left voltage distributor (CAN) connector)

- Test terminating resistor of component X30/5 (Left voltage distributor (CAN) connector).

- Test terminating resistor of CAN element in control module 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.