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Home >> Mercedes Benz >> 2011 >> E 550 Coupe (207.372) V8-5.5L (273.966) >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> Manufacturer Code Charts >> 2046 >> Part 3

Part 3


Physical fill level fault: upper limit exceeded (tank 2)

1.1.1.2.2. Resistance test of engine compartment CAN

Test 1.1.1.2.2.1: Test total resistance of engine compartment CAN.

Test 1.1.1.2.2.2: Test terminating resistor of component X30/5 (Left voltage distributor (CAN) connector).

Test 1.1.1.2.2.3: Test terminating resistor of CAN element in control module N3/10 (ME-SFI [ME] control unit).

1.1.1.2.2.1. Test total resistance of engine compartment CAN.

Test 1.1.1.2.2.1.1: Perform measurement at component X30/5 (Left voltage distributor (CAN) connector).

Test 1.1.1.2.2.1.2: Perform measurement at component N3/10 (ME-SFI [ME] control unit).

1.1.1.2.2.1.1. Perform measurement at component X30/5 (Left voltage distributor (CAN) connector).
Test total resistance of engine compartment CAN.
Figure legend

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

- Switch off ignition.
- Measurement with multimeter
- (X30/5) 2.Measure resistance with multimeter between pins 2 and 2.1 (X30/5)
Adapter cable no. W220 589 00 99 36 may be used.Specified value

- [55...65]ohms
Question:

- Is the measured value within the specified value range?







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

1.1.1.2.2.1.2. Perform measurement at component N3/10 (ME-SFI [ME] control unit).
Test total resistance of the CAN engine.
Test sequence

- Switch off ignition.
- Connect socket box to 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[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

1.1.1.2.2.2. 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

1.1.1.2.2.3. 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

1.1.1.3. 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 )

1.1.1.4. 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 1.1.1.4.1: Actual values via CAN ( Engine CAN bus )

1.1.1.4.1. 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 1.1.1.4.1.1: Motor electronics

Test 1.1.1.4.1.2: Steering column module

Test 1.1.1.4.1.3: Function-specific actual values :

Test 1.1.1.4.1.4: Cruise control

Test 1.1.1.4.1.5: Drive authorization

Test 1.1.1.4.1.6: Control unit-specific actual values :

Test 1.1.1.4.1.7: Electronic selector module

Test 1.1.1.4.1.8: Transmission control

1.1.1.4.1.1. Motor electronics
Warning!Communication with ECU required.


1.1.1.4.1.2. Steering column module
Warning!Communication with ECU required.


1.1.1.4.1.3. Function-specific actual values :

1.1.1.4.1.3. No further information available.

1.1.1.4.1.4. Cruise control
Warning!Communication with ECU required.


1.1.1.4.1.5. Drive authorization
Warning!Communication with ECU required.


1.1.1.4.1.6. Control unit-specific actual values :

1.1.1.4.1.6. No further information available.

1.1.1.4.1.7. Electronic selector module
Warning!Communication with ECU required.


1.1.1.4.1.8. Transmission control
Warning!Communication with ECU required.


1.1.2. Procedure in case of CAN faults

Test 1.1.2.1: How do I quickly reach my goal?

Test 1.1.2.2: General test information

Test 1.1.2.3: General CAN fundamentals

Test 1.1.2.4: Possible aids and their usage

1.1.2.1. 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.

1.1.2.2. 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.
- The cause of this is not the CAN networking, but the transmitter control unit or its sensors.
- Further possible causes of fault:
- Magnetic fields caused by nearby high-voltage installations, railroad installations or power plants.
- Magnetic fields can radiate on to lines and control units in rare cases and cause undefined behavior in the control units.
- The special tool 'Star Diagnosis CANtool' can be used to log bus wake-up events, bus keepawake events and other signals.
Bus keepawake event

- When a control unit keeps communication on the bus awake without reason, this is designated a bus keepawake event.
- The cause of this is not the CAN networking, but the transmitter control unit or its sensors.
- Further possible causes of fault:
- Magnetic fields caused by nearby high-voltage installations, railroad installations or power plants.
- Magnetic fields can radiate on to lines and control units in rare cases and cause undefined behavior in the control units.
- The special tool 'Star Diagnosis CANtool' can be used to log bus wake-up events, bus keepawake events and other signals.


1.1.2.2. No further information available.

1.1.2.3. General CAN fundamentals

Test 1.1.2.3.1: Low-Speed CAN (83,3 kBit/s)

Test 1.1.2.3.2: High-Speed CAN (125 kBit/s , 500 kBit/s)

1.1.2.3.1. Low-Speed CAN (83,3 kBit/s)
General CAN fundamentals
Low-Speed CAN (83,3 kBit/s)

- 83,3 kBit/s : For example:Interior CAN busSeries 211

- This CAN bus enables single-wire mode.
- 'Single-wire mode' means that fault-free communication between the control units is still possible even if one of the two CAN lines fails.
- This CAN bus does not require external terminating resistors.
Legend and description for figure 1CAN-H: CAN bus HighCAN-L: CAN bus LowECU 1 ... n: Control unit 1 ... nLegend and description for figure 2U 1: Specification approx. 3,6 voltsU 2: Specification approx. 0 voltsU 3: Specification approx. 2,5 voltsU 4: Specification approx. 1,4 voltsU 5: Specification approx. 5 voltsContinue with button F2













1.1.2.3.1. No further information available.

1.1.2.3.2. High-Speed CAN (125 kBit/s , 500 kBit/s)
General CAN fundamentals
High-Speed CAN (125 kBit/s , 500 kBit/s)

- 125 kBit/s : Interior CAN busSeries 221
- 125 kBit/s : Telematic CAN busSeries 221
- 500 kBit/s : For example:Drive train CAN bus
- 500 kBit/s : For example:Diagnostic CAN-Bus

- This CAN bus does not permit single-wire mode.
- This means that both CAN lines are always required for fault-free communication between the control units.
- This CAN bus requires external terminating resistors.
- The terminating resistors can be located in control units or voltage distributors depending on the CAN bus.
Legend and description for figure 1CAN-H: CAN bus HighCAN-L: CAN bus LowECU 1 ... n: Control unit 1 ... nCAN terminating resistor ( Example: 120ohms)Legend and description for figure 2U 1: Specification approx. 3,6 voltsU 2: Specification approx. 2,5 voltsU 3: Specification approx. 1,4 voltsContinue with button F2













1.1.2.3.2. No further information available.

1.1.2.4. Possible aids and their usage
Evaluation of CAN fault codes

- The control units present in the vehicle (actual configuration) are compared with the coding in control unit CGW (specified configuration).
- Filtering and evaluation of all CAN timeout fault codes present in the vehicleThe result of the evaluation leads to the required test steps.
Multimeter

- Aids for voltage and resistance measurement in menu item 'Measurements with multimeter on CAN network'
Measuring system

- Aid for graphic representation of CAN signal and voltage levels
- The specified characteristics shown in Measurement Technology are used to recognize changed CAN voltage levels, which can be caused by faulty CAN components.
- Possible procedure: Disconnect and then reconnect the CAN bus subscribers at the voltage distributor one at a time.Compare the pass image with the actual image from the oscilloscope.
Star Diagnosis CANtool

- Aids for representation of actual values and identification of bus wake-up events and bus keepawake events
Continue with button F2

1.1.2.4. No further information available.

1.1.3. Read current CAN configuration and CAN fault codes
Warning!Communication with ECU required.

2. Check component A1 (Instrument cluster).
Read and process fault code from control module A1 (Instrument cluster).
Possible cause and remedy

- Read and process fault code from control module A1 (Instrument cluster).
End of test

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