- Test terminating resistor of CAN element in control module N3/10 (ME-SFI [ME] control unit).
End of test
1.1.3.2.2.3. 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
1.1.3.3. 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 :
