Part 2
One or more signals sent from control unit N51/2 (ABC control module) via the CAN bus is implausible.
1.1.3.2.1.8. Check power supply at control unit N3/10 (ME-SFI [ME] control unit).
Test 1.1.3.2.1.8.1: Test voltage supply of circuit 87. ( Check using actual value )
Test 1.1.3.2.1.8.2: Test voltage supply of circuit 30.
Test 1.1.3.2.1.8.3: Test current consumption of component N10/1kR (Circuit 87 relay, engine).
Test 1.1.3.2.1.8.4: Test voltage supply of circuit 15.
1.1.3.2.1.8.1. Test voltage supply of circuit 87. ( Check using actual value )
Test prerequisite
- The voltage test at component G1 (Battery) is o.k.
- Ignition ON
Status of relevant actual value:
- Battery voltage:Warning! Communication with ECU required.
Specified value
- Battery voltage[11.0 ... 15.0] V
Question:Is the actual value o.k.?
YES
The actual value is okay.End of test
NO
The actual value is not o.k.Possible cause and remedy
- Test voltage supply of circuit 30.
- Test voltage supply of circuit 87.
1.1.3.2.1.8.2. 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
- F34f42 (Fuse 42)
- Lines
End of test
1.1.3.2.1.8.3. 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
1.1.3.2.1.8.4. 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
- N10/1f52 (Fuse 52)
- Lines
End of test
1.1.3.2.1.9. Check power supply at control unit N15/3 (ETC [EGS] control unit).
Test 1.1.3.2.1.9.1: Guided test
1.1.3.2.1.9.1. Guided test
Operation number of operation texts and work units or standard texts and flat rates:27-0641Possible cause
- Battery has incorrect charge state or is faulty.
- Local undervoltage of component N15/3 (ETC [EGS] control unit)
Test sequence
- Erase fault memory.
Continue with button "F2"
Warning!Communication with ECU required.
1.1.3.2.1.10. Check power supply at control unit N15/5 (Electronic selector lever module control unit).
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
1.1.3.2.1.11. Check power supply at control unit N15/6 (Sprintshift control module).
Test voltage supply of circuit 30.
Operation number of operation texts and work units or standard texts and flat rates:26-0641Test sequence
- Switch off ignition.
- Connect socket box to component N15/6 (Sprintshift control module).
- Measure direct voltage with multimeter between sockets (B.36) 36 and (B.38) 38 of the 126-pole socket box tester.
- Switch on ignition.
Specified value
- Voltage[11.0...14.5] V
Question
- Are the measurement values OK?
YES
Test voltage supply of circuit 87.
Operation number of operation texts and work units or standard texts and flat rates:26-0641Test sequence
- Switch off ignition.
- Connect socket box to component N15/6 (Sprintshift control module).
- Measure direct voltage with multimeter between sockets (A.30) 30 and (A.29) 29 of the 126-pole socket box tester.
- Switch on ignition.
Specified value
- Voltage[11.0...14.5] 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
- Line from component N10/1 (Front SAM control unit with fuse and relay module) to component N15/6 (Sprintshift control module)
End of test
NO
The measurement value is not OK.Possible cause and remedy
- Check fuse "f63" (voltage supply from control unit ASG) in component N10/1 (Front SAM control unit with fuse and relay module).
- Test cables
End of test
1.1.3.2.1.12. Check power supply at control unit N47-5 (ESP, SPS [PML] and BAS control unit).
Test 1.1.3.2.1.12.1: Test voltage of terminal 87 at control unit N47-5 (ESP, SPS [PML] and BAS control unit).
Test 1.1.3.2.1.12.2: Test of cable for voltage supply
Test 1.1.3.2.1.12.3: Test procedure ground cable
1.1.3.2.1.12.1. Test voltage of terminal 87 at control unit N47-5 (ESP, SPS [PML] and BAS control unit).
Test prerequisite
- Battery voltage is OK.
Test sequence
- Switch off ignition.
- Connect socket box.
- Switch on ignition.
- Measure direct voltage with multimeter between sockets (2.23) 57 and (2.14) 48 of the 126-pole socket box tester.
Specified value
- [11...14 V]
Question
- Is the measurement value OK?
YES
The measurement value is 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
The measurement value is not OK.Possible cause and remedy
- Lines to component N47-5 (ESP, SPS [PML] and BAS control unit)
- N10/1f47 (Fuse 47)
End of test
1.1.3.2.1.12.2. 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 (2.14) 48 of the 126-pole socket box tester.
Specified value
- [11...14 V]
Question
- Is the measurement value OK?
YES
The measurement value is 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
The measurement value is not OK.Possible cause and remedy
- Lines to component N47-5 (ESP, SPS [PML] and BAS control unit)
- N10/1f47 (Fuse 47)
End of test
1.1.3.2.1.12.3. Test procedure ground cable
Test prerequisite
- Battery voltage is OK.
Test sequence
- Switch off ignition.
- Connect socket box.
- WMeasure resistance with multimeter between 9 and (2.23) 57 of the 35-pole socket box tester.
Specified value
- [<1ohms]
Question
- Is the measurement value OK?
YES
The measurement value is 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
The measurement value is not OK.Possible cause and remedy
- Ground cable
- W9 (Ground (at front left headlamp unit))
End of test
1.1.3.2.1.13. Check power supply at control unit N51 (AIRmatic with ADS control module).
Test 1.1.3.2.1.13.1: Test voltage supply of circuit 30.
Test 1.1.3.2.1.13.2: Test voltage supply of circuit 87.
1.1.3.2.1.13.1. Test voltage supply of circuit 30.
Test 1.1.3.2.1.13.1.1: Test voltage of terminal 30 at control unit N51 (AIRmatic with ADS control module).
Test 1.1.3.2.1.13.1.2: Test of cable for voltage supply
Test 1.1.3.2.1.13.1.3: Test procedure ground cable
1.1.3.2.1.13.1.1. Test voltage of terminal 30 at control unit N51 (AIRmatic with ADS control module).
Test prerequisite
- Battery voltage is OK.
Status of the relevant actual values:
- Terminal 30:Warning! Communication with ECU required.
Test sequence
- Switch off ignition.
- Connect socket box.
- Switch on ignition.
- Measure direct voltage with multimeter between sockets (2.21) 55 and (2.47) 81 of the 126-pole socket box tester.
Specified value
- [11...14 V]
Question
- Is the measurement value OK?
YES
The measurement value is 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
The actual value is not o.k.Note
- This test did not produce any clear result.
- Select further tests.
1.1.3.2.1.13.1.2. 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 (2.47) 81 of the 126-pole socket box tester.
Specified value
- [11...14 V]
Question
- Is the measurement value OK?
YES
The measurement value is 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
The measurement value is not OK.Possible cause and remedy
- Lines to component N51 (AIRmatic with ADS control module)
- F34f37 (Fuse 37)
End of test
1.1.3.2.1.13.1.3. Test procedure ground cable
Test prerequisite
- Battery voltage is OK.
Test sequence
- Switch off ignition.
- Connect socket box.
- W15/Measure resistance with multimeter between 1 and (2.21) 55 of the 35-pole socket box tester.
Specified value
- [<1ohms]
Question
- Is the measurement value OK?
YES
The measurement value is 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
The measurement value is not OK.Possible cause and remedy
- Ground cable
- W15/1 (Ground (right footwell))
End of test
1.1.3.2.1.13.2. Test voltage supply of circuit 87.
Test 1.1.3.2.1.13.2.1: Test voltage of terminal 87 at control unit N51 (AIRmatic with ADS control module).
Test 1.1.3.2.1.13.2.2: Test of cable for voltage supply
Test 1.1.3.2.1.13.2.3: Test procedure ground cable
1.1.3.2.1.13.2.1. Test voltage of terminal 87 at control unit N51 (AIRmatic with ADS control module).
Test prerequisite
- Battery voltage is OK.
Test sequence
- Switch off ignition.
- Connect socket box.
- Switch on ignition.
- Measure direct voltage with multimeter between sockets (2.21) 55 and (2.43) 77 of the 126-pole socket box tester.
Specified value
- [11...14 V]
Question
- Is the measurement value OK?
YES
The measurement value is 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
The actual value is not o.k.Note
- This test did not produce any clear result.
- Select further tests.
1.1.3.2.1.13.2.2. 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 (2.43) 77 of the 126-pole socket box tester.
Specified value
- [11...14 V]
Question
- Is the measurement value OK?
YES
The measurement value is 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
The measurement value is not OK.Possible cause and remedy
- Lines to component N51 (AIRmatic with ADS control module)
- N10/1f45 (Fuse 45)
End of test
1.1.3.2.1.13.2.3. Test procedure ground cable
Test prerequisite
- Battery voltage is OK.
Test sequence
- Switch off ignition.
- Connect socket box.
- W15/Measure resistance with multimeter between 1 and (2.21) 55 of the 35-pole socket box tester.
Specified value
- [<1ohms]
Question
- Is the measurement value OK?
YES
The measurement value is 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
The measurement value is not OK.Possible cause and remedy
- Ground cable
- W15/1 (Ground (right footwell))
End of test
1.1.3.2.2. Resistance test of engine compartment CAN
Test 1.1.3.2.2.1: Test total resistance of engine compartment CAN.
Test 1.1.3.2.2.2: Test terminating resistor of component X30/5 (Left voltage distributor (CAN) connector).
Test 1.1.3.2.2.3: Test terminating resistor of CAN element in control module N3/10 (ME-SFI [ME] control unit).
1.1.3.2.2.1. Test total resistance of engine compartment CAN.
Test 1.1.3.2.2.1.1: Perform measurement at component X30/5 (Left voltage distributor (CAN) connector).
Test 1.1.3.2.2.1.2: Perform measurement at component N3/10 (ME-SFI [ME] control unit).
1.1.3.2.2.1.1. 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
1.1.3.2.2.1.2. 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
1.1.3.2.2.2. 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
- 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.
1.1.3.4.1.2. Cruise control
Warning!Communication with ECU required.
1.1.3.4.1.3. Drive authorization
Warning!Communication with ECU required.
1.1.3.4.1.4. Control unit-specific actual values :
1.1.3.4.1.4. No further information available.
1.1.3.4.1.5. Electronic selector module
Warning!Communication with ECU required.
1.1.3.4.1.6. Transmission control
Warning!Communication with ECU required.
1.1.3.4.1.7. Motor electronics
Warning!Communication with ECU required.
1.1.3.4.1.8. Steering column module
Warning!Communication with ECU required.