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Home >> Mercedes Benz >> 2008 >> SLK 280 (171.454) V6-3.0L (272.942) >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> Manufacturer Code Charts >> ED402 >> Part 1

Part 1


No CAN message was received from control unit Engine management.


Possible cause:

- Engine compartment CAN databus
Affected functions:

- CAN Communication
- Automatic transmission Function

-------------------------------------------------

Test 1: Engine compartment CAN test

1. Engine compartment CAN test

Test 1.1: Procedure in case of CAN faults

Test 1.2: Evaluation of CAN fault codes

Test 1.3: Further CAN test options

1.1. Procedure in case of CAN faults

Test 1.1.1: How do I quickly reach my goal?

Test 1.1.2: General test information

Test 1.1.3: General CAN fundamentals

Test 1.1.4: Possible aids and their usage

1.1.1. 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. 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. No further information available.

1.1.3. General CAN fundamentals

Test 1.1.3.1: Low-Speed CAN (83,3 kBit/s)

Test 1.1.3.2: High-Speed CAN (125 kBit/s , 500 kBit/s)

1.1.3.1. 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













1.1.3.1. No further information available.

1.1.3.2. 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













1.1.3.2. No further information available.

1.1.4. 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

1.1.4. No further information available.

1.2. Evaluation of CAN fault codes
Warning!Communication with ECU required.

1.3. Further CAN test options

Test 1.3.1: Information to engine compartment CAN network

Test 1.3.2: Measurements with multimeter on CAN network

Test 1.3.3: Test with the aid of the measuring system

1.3.1. Information to engine compartment CAN network

Test 1.3.1.1: Arrangement diagram

Test 1.3.1.2: Wiring diagram of CAN bus

1.3.1.1. Arrangement diagram
Location diagram (with special equipment)
Figure legend

- A1 (Instrument cluster)
- N3/10 (ME-SFI [ME] control unit)
- N73 (EIS [EZS] control unit)
- N47-5 (ESP and BAS control module)
- N15/3 (ETC [EGS] control unit)
- N15/5 (Electronic selector lever module control unit)
- N71 (Headlamp range adjustment control module)
- N93 (Central gateway control unit)
- N15/6 (Sprintshift control module)
- N80 (Steering column module)
- X11/4 (Diagnosis test connector)
- X63/4 (CAN databus adapter connector, 2-pin)
- Installation point of plug connection X63/4 (CAN databus adapter connector, 2-pin)
- Communication with ECU required







1.3.1.2. Wiring diagram of CAN bus
Note

- WIS is not available on this system.
- It is not possible to display the requested WIS document [ PE0019P2200TA ].
- You can start WIS on another system and display the WIS document by entering the document number [ PE0019P2200TA ] in the 'Contents' field.


1.3.1.2. No further information available.

1.3.2. Measurements with multimeter on CAN network

Test 1.3.2.1: Voltage supply of engine compartment CAN control modules

Test 1.3.2.2: Resistance test of engine compartment CAN

1.3.2.1. Voltage supply of engine compartment CAN control modules

Test 1.3.2.1.1: Check power supply at control unit ME-SFI.

Test 1.3.2.1.2: Check power supply at control unit ESP.

Test 1.3.2.1.3: Check power supply at control unit ETC.

Test 1.3.2.1.4: Check power supply at control unit ESM.

Test 1.3.2.1.5: Check power supply at control unit EZS.

Test 1.3.2.1.6: Check power supply at control unit A1 (Instrument cluster).

Test 1.3.2.1.7: Check power supply at control unit N80 (Steering column module).

Test 1.3.2.1.8: Check power supply at control unit N71 (Headlamp range adjustment control module).

Test 1.3.2.1.9: Check power supply at control unit N93 (Central gateway control unit).

Test 1.3.2.1.10: Check power supply at control unit Y3/8n4 (Fully integrated transmission control (VGS) control unit).

1.3.2.1.1. Check power supply at control unit ME-SFI.

Test 1.3.2.1.1.1: Test voltage supply of circuit 30.

Test 1.3.2.1.1.2: Test current consumption of component N10/1kR (Circuit 87 relay, engine).

Test 1.3.2.1.1.3: Test voltage supply of circuit 15.

1.3.2.1.1.1. Test voltage supply of circuit 30.
Connect socket box to component N3/10 (ME-SFI [ME] control unit).
Figure legend

- A -ConnectionTest cable 35-pin socket box
- 001 -Sockets of component N3/10 (ME-SFI [ME] control unit)
- 05 -35-pin socket box
- 050 -126-pin socket box
- 108 -Test cable 266 589 01 63 00
- N3/10 (ME-SFI [ME] control unit)
- II 1-63ConnectionTest cable
- III 64-126ConnectionTest cable
Warning!

-
- Connection A of test cable 108 may NOT be connected to connection B of the 126-pin socket box (050).
Continue to test with button F2







Test voltage supply of circuit 30.
Test sequence

- Measure direct voltage with multimeter between sockets [ F.2 ] 98 and [ F.16 ] 112 of the 35-pole socket box tester.
- Switch on ignition.
Specified value

- Voltage[11.0...15.0] V
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

- N10/1f57 (Fuse 57)
- Lines
End of test







1.3.2.1.1.2. Test current consumption of component N10/1kR (Circuit 87 relay, engine).
Connect socket box to component N3/10 (ME-SFI [ME] control unit).
Figure legend

- A -ConnectionTest cable 35-pin socket box
- 001 -Sockets of component N3/10 (ME-SFI [ME] control unit)
- 05 -35-pin socket box
- 050 -126-pin socket box
- 108 -Test cable 266 589 01 63 00
- N3/10 (ME-SFI [ME] control unit)
- II 1-63ConnectionTest cable
- III 64-126ConnectionTest cable
Warning!

-
- Connection A of test cable 108 may NOT be connected to connection B of the 126-pin socket box (050).
Continue to test with button F2







Test current consumption of component N10/1kR (Circuit 87 relay, engine).
Test sequence

- Measure direct current with multimeter between sockets [F.4] 100 and [F.27] 123 of the 126-pole socket box tester.
- Switch on ignition.
Specified value

- Amperage[0.1...0.3] A
Question

- Is the measurement value OK?


YES
The test was okay.End of test

NO
The measurement value is not OK.Possible cause and remedy

- Lines to component N10/1kR (Circuit 87 relay, engine)
- N10/1kR (Circuit 87 relay, engine)
End of test

1.3.2.1.1.3. Test voltage supply of circuit 15.
Connect socket box to component N3/10 (ME-SFI [ME] control unit).
Figure legend

- A -ConnectionTest cable 35-pin socket box
- 001 -Sockets of component N3/10 (ME-SFI [ME] control unit)
- 05 -35-pin socket box
- 050 -126-pin socket box
- 108 -Test cable 266 589 01 63 00
- N3/10 (ME-SFI [ME] control unit)
- II 1-63ConnectionTest cable
- III 64-126ConnectionTest cable
Warning!

-
- Connection A of test cable 108 may NOT be connected to connection B of the 126-pin socket box (050).
Continue to test with button F2







Test voltage supply of circuit 15.
Test sequence

- Measure direct voltage with multimeter between sockets [ F.2 ] 98 and [ F.15 ] 111 of the 35-pole socket box tester.
- Switch on ignition.
Specified value

- Voltage[11.0...15.0] V
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

- N10/1kP (Circuit 15 relay)
- Lines
End of test







1.3.2.1.2. Check power supply at control unit ESP.

Test 1.3.2.1.2.1: Test voltage of terminal 87 at control unit N47-5 (ESP, SPS [PML] and BAS control unit).

Test 1.3.2.1.2.2: Test of cable for voltage supply

Test 1.3.2.1.2.3: Test procedure ground cable

1.3.2.1.2.1. Test voltage of terminal 87 at control unit N47-5 (ESP, SPS [PML] and BAS control unit).

1.3.2.1.2.1. No further information available.

1.3.2.1.2.2. Test of cable for voltage supply
Test prerequisite

- Battery voltage is OK.
Test sequence

- Switch off ignition.
- Connect socket box.
- Switch on ignition.

- Measure direct voltage with multimeter between ground and socket (1.14) 14 of the 126-pole socket box tester.
Specified value

- Voltage[11.0...14.5] V
Question

- Is the measurement value OK?


YES
The measurement value is OK.Note

- Select further tests.


NO
The measurement value is not OK.Possible cause and remedy

- Lines
- F1f34 (Fuse 34)
End of test

1.3.2.1.2.3. Test procedure ground cable
Test prerequisite

- Battery voltage is OK.
Test sequence

- Switch off ignition.
- Connect socket box.

- W16/Measure resistance with multimeter between 3 and (2.23) 57 of the 35-pole socket box tester.

- W16/Measure resistance with multimeter between 3 and (2.47) 81 of the 35-pole socket box tester.
Specified value

- Resistor< 1ohms
Question

- Are the measurement values OK?


YES
The measurement values are OK.Note

- In the event of stored faults with a high fault frequency count or in the event of customer complaints, check lines and connectors for loose contact and corrosion..
End of test

NO
At least one of the measured values is not o.k.Possible cause and remedy

- Ground cable
- W16/3 (Ground (left of component compartment, power ground))
End of test

1.3.2.1.3. Check power supply at control unit ETC.
Operation number of operation texts and work units or standard texts and flat rates:27-0641Test sequence

- Switch off ignition.
- Connect socket box.
- Switch on ignition.
- Measure direct voltage with multimeter between sockets [2.30] 30 and [2.29] 29 of the 126-pole socket box tester.
Specified value

- Voltage[11.0...14.0] V
Question

- Is the measurement value OK?


YES
The measurement value is OK.Possible cause and remedy

- Replace component N15/3 (ETC [EGS] control unit).
End of test

NO
The measurement value is not OK.Possible cause and remedy

- Inspect connector 2 at control unit N15/3 (ETC [EGS] control unit) for damage, correct connection, loose contact and corrosion and repair, if necessary.
End of test

1.3.2.1.4. Check power supply at control unit ESM.
Operation number of operation texts and work units or standard texts and flat rates:27-0641Test sequence

- Switch off ignition.
- Disconnect connector at component N15/5 (Electronic selector lever module control unit).
- Switch on ignition.
- [A.2] Measure direct voltage with multimeter between 2 and 1 [A.1]
Status of relevant actual value:
- Supply voltage (tml. 15):Warning! Communication with ECU required.
Specified value

- Voltage[7.0...16.0] V
Question

- Is the measurement value OK?


YES
The measurement value is OK.Possible cause and remedy

- Replace component Floor-mounted shift.
End of test

NO
The measurement value is not OK.Possible cause and remedy

- Check fuse f55 (voltage supply from control unit ESM) in component N10/1 (Front SAM control unit with fuse and relay module).
- Check all affected plugs, connectors and electrical components for damage, loose contact, corrosion etc. and repair if necessary.
End of test

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