Part 2

One or more signals sent from control unit Traction systems via the CAN bus is implausible.

1.1.3.2.1.3. Check power supply at control unit N3/10 (ME-SFI [ME] control unit).

Test 1.1.3.2.1.3.1: Test voltage supply of circuit 87. ( Check using actual value )

Test 1.1.3.2.1.3.2: Test voltage supply of circuit 30.

Test 1.1.3.2.1.3.3: Test current consumption of component N10/1kR (Circuit 87 relay, engine).

Test 1.1.3.2.1.3.4: Test voltage supply of circuit 15.

1.1.3.2.1.3.1. 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.

1.1.3.2.1.3.2. 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

1.1.3.2.1.3.3. 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

1.1.3.2.1.3.4. 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

1.1.3.2.1.4. Check power supply at control unit Y3/8n4 (Fully integrated transmission control (VGS) control unit).
Operation number of operation texts and work units or standard texts and flat rates:27-0641Test prerequisite

- Battery voltage is OK.
- Fuse N10/1f46 (Fuse 46) in component N10/1 (Driver-side SAM control unit with fuse and relay module) is o.k.
Test sequence

- Switch off ignition.
- Separate plug connection at transmission.
- Measure voltage in transmission wiring harness using a multimeter.
- Switch on ignition.
Measure direct voltage with multimeter between 5 and 4Specified value

- Voltage [8,5...16,4] V
Question

- Is the measurement value OK?

YES
The measurement value is OK.Further causes

- The diagnosis line is not OK
- Perform test on diagnosis line.
Press button "F2" for further tests

Test K cable to control unit Y3/8n4 (Fully integrated transmission control (VGS) control unit).
Operation number of operation texts and work units or standard texts and flat rates:27-0641Test prerequisite

- The power supply of component Y3/8n4 (Fully integrated transmission control (VGS) control unit) is OK.
Test sequence

- Switch on ignition.
- Test voltage at component X11/4 (Diagnosis test connector).
- If several control modules are connected to a K-wire, the voltage can be measured even if an open circuit exists.
Measure direct voltage with multimeter between (X11/4) 11 and (-) ground.Specified value

- Voltage [8,5...16,4] V
Question

- Is the measurement value OK?

YES
Test sequence

- Switch off ignition.
- Separate plug connection at transmission.
- Measure voltage in transmission wiring harness using a multimeter.

- Measure resistance with multimeter between ground and 3
Specified value

- Resistance measured: [OL] ohms
Question

- Is the measurement value OK?

YES
Further image can be displayed with key F7.X11/4 (Diagnosis test connector)Test sequence

- Switch off ignition.
- Separate plug connection at transmission.
- Measure voltage in transmission wiring harness using a multimeter.

- Measure resistance with multimeter between 3 and 11 (X11/4)
Specified value

- Resistance measured: [< 0,6] ohms
Question

- Is the measurement value OK?

YES
The measurement value is OK.Cause

- Control module has an internal error.
REMEDY

- Disassemble and assemble automatic transmission using the repair instructions.
- Exchange electrohydraulic control unit.
IMPORTANT NOTEFollowing the repair measures, the following checks MUST be carried out using the Diagnosis Assistance System, menu 'Control unit adaptations'

- Flash programming of control unit Y3/8n4 (Fully integrated transmission control (VGS) control unit)
- SCN coding
End of test

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

- Diagnostic cable has short to ground.
- Inspect wiring and connectors at connection points for loose contacts, damage and corrosion. Repair or replace as required.
End of test

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

- Diagnostic cable has open circuit.
- Inspect wiring and connectors at connection points for loose contacts, damage and corrosion. Repair or replace as required.
End of test

NO
The measurement value is not OK.Further causes

- Voltage supply line is not OK.
Press button "F2" for further tests

1.1.3.2.1.4. No further information available.

1.1.3.2.1.5. Check power supply at control unit N15/3 (ETC [EGS] control unit).

Test 1.1.3.2.1.5.1: Guided test

1.1.3.2.1.5.1. 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.

1.1.3.2.1.6. 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

1.1.3.2.1.7. 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