Tuesday, June 30, 2020

Mercedes Benz Truck GLK 350 (204.956) V6-3.5L (272.991) Manufacturer Code Page 1174

Mercedes Benz Truck GLK 350 (204.956) V6-3.5L (272.991) Manufacturer Code Page 1174

- 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

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

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

Test sequence

- Switch off ignition.

- Connect socket box to component N3/10 (ME-SFI [ME] control unit).

- Disconnect coupling F at component N3/10 (ME-SFI [ME] control unit).

- Measure resistance with multimeter between sockets (F.41) 11 and (F.54) 24 of the 35-pole socket box tester.

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

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

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

End of test

1.1.3.2.2.3. Test terminating resistor of CAN element in control module N3/10 (ME-SFI [ME] control unit).

Test terminating resistor of component N3/10 (ME-SFI [ME] control unit).

Test sequence

- Switch off ignition.

- Connect socket box to component N3/10 (ME-SFI [ME] control unit).

- Connector F is plugged in at control unit.

- Unplug the socket F from the wiring harness at the socket box.

- Measure resistance with multimeter between sockets (F.41) 11 and (F.54) 24 of the 35-pole socket box tester.

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