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Home >> Mercedes Benz >> 2008 >> ML 63 AMG (164.177) V8-6.3L (156.980) >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> Manufacturer Code Charts >> E1437 >> Part 2

Part 2


No CAN message was received from control unit Air conditioning.

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

Test 2.1.2.2.1.3.1: Check power supply at control unit N3/10 (ME-SFI [ME] control unit).

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

Test 2.1.2.2.1.3.1.1: Test voltage supply of circuit 87. ( Check using actual value )

Test 2.1.2.2.1.3.1.2: Test voltage supply of circuit 30.

Test 2.1.2.2.1.3.1.3: Test current consumption of component K40/4kK (Engine electronics and chassis relay).

Test 2.1.2.2.1.3.1.4: Test voltage supply of circuit 15.

2.1.2.2.1.3.1.1. 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.


2.1.2.2.1.3.1.2. 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

- F33f3 (Fuse 3)
- Lines
End of test







2.1.2.2.1.3.1.3. Test current consumption of component K40/4kK (Engine electronics and chassis relay).
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 K40/4kK (Engine electronics and chassis relay).
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 K40/4kK (Engine electronics and chassis relay)
- K40/4kK (Engine electronics and chassis relay)
End of test

2.1.2.2.1.3.1.4. 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

- K40/2f19 (Fuse 19)
- Lines
End of test







2.1.2.2.1.4. Check power supply at control unit N15/3 (ETC [EGS] control unit).
Warning!Communication with ECU required.


2.1.2.2.1.5. Check power supply at control unit N15/5 (Electronic selector lever module control unit).
Warning!Communication with ECU required.


2.1.2.2.1.6. Check power supply at control unit N47-5 (ESP, SPS [PML] and BAS control unit).
Warning!Communication with ECU required.


2.1.2.2.1.7. Check power supply at control unit N51/2 (ABC control module).
Warning!Communication with ECU required.


2.1.2.2.1.8. Check power supply at control unit N63/1 (DTR control module).
Warning!Communication with ECU required.


2.1.2.2.1.9. Check power supply at control unit N73 (EIS [EZS] control unit).
Warning!Communication with ECU required.


2.1.2.2.1.10. Check power supply at control unit N80 (Steering column module).
Warning!Communication with ECU required.


2.1.2.2.1.11. Check power supply at control unit N93 (Central gateway control unit).

2.1.2.2.1.11. No further information available.

If the fault code is not current, it may be deleted. In this case, the battery voltage was too low over an extended period.Charge the battery, if necessary.Note:This fault could result in consequential faults. You should therefore process this fault first and then erase the fault memory.Question:Is the fault current in several control modules?

YES
Possible cause and remedy

- Battery voltage too low.Test battery.Charge battery, replace if necessary.
- If fault occurs again:Check alternator.Communication with ECU required
- The quiescent current is too high.Test quiescent current.


NO
Test prerequisite

- Fuse o.k.
- Fuse o.k.
Test sequence

- Ignition: OFF
- Measurement at component
- Measure direct voltage with multimeter between ground socket and socket
Specified value

- Voltage[11.0...14.5] V
Question

- Is the measurement value OK?
( Picture : Example )







YES
Test sequence

- Unplug connector 8 at control unit N93 (Central gateway control unit).
- Measurement at connector 8
- Measure direct voltage with multimeter between sockets (N93) 8.1 and (N93) 8.6
Specified value

- Voltage[11.0...14.5] V
Question

- Is the measurement value OK?







YES
The measurement value is OK.Restore original status.

- Plug in the connector 8 at component N93 (Central gateway control unit).
- Switch on ignition.
End of test

NO
The measurement value is not OK.Possible cause and remedy in the case of undervoltage

- Lines between N93 (Central gateway control unit) and
- Lines between N93 (Central gateway control unit) and
End of test

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

- Lines between and
- G1 (Battery)
- G2 (generator)
End of test

2.1.2.2.1.12. 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 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.Possible cause of fault

- The conductors in the electrohydraulic control unit are interrupted.
- Component Y3/8n4 (Fully integrated transmission control (VGS) control unit) is defective.
Possible remedy

- Replace component Y3/8 (Electric control unit (VGS)).
Following the repair measures, the following checks MUST be carried out using the Diagnosis Assistance System, menu 'Initial startup'

- Initial startup with manual settings input for new control unit
End of test







NO

Test 2.1.2.2.1.12.1: The measurement value is not OK.

Test 2.1.2.2.1.12.2: Possible cause and remedy

Test 2.1.2.2.1.12.3: Test regulator and generator.

2.1.2.2.1.12.1. The measurement value is not OK.

2.1.2.2.1.12.1. No further information available.

2.1.2.2.1.12.2. Possible cause and remedy

2.1.2.2.1.12.2. No further information available.

2.1.2.2.1.12.3. Test regulator and generator.
Note on alternator testDepending on the engine variant, different alternators are installed.

- Alternators without networking
- Alternators networked with engine control unit
Networked alternators can be diagnosed via the engine control unit.Detailed information on alternator testing can be found in WIS.Press button F2 to go to WIS documents

2.1.2.2.1.12.3. No further information available.

2.1.2.2.2. Resistance test of engine compartment CAN

Test 2.1.2.2.2.1: Test total resistance of engine compartment CAN.

Test 2.1.2.2.2.2: Test terminating resistor of component X30/18 (Left voltage distributor connector (CAN C)).

Test 2.1.2.2.2.3: Test terminating resistor of CAN element in control module N3/10 (ME-SFI [ME] control unit).

2.1.2.2.2.1. Test total resistance of engine compartment CAN.

Test 2.1.2.2.2.1.1: Perform measurement at component X30/18 (Left voltage distributor connector (CAN C)).

Test 2.1.2.2.2.1.2: Perform measurement at component N3/10 (ME-SFI [ME] control unit).

2.1.2.2.2.1.1. Perform measurement at component X30/18 (Left voltage distributor connector (CAN C)).
Test total resistance of engine compartment CAN.
Figure legend

- X30/18 (Left voltage distributor connector (CAN C))
Test sequence

- Switch off ignition.
- Measurement with multimeter
- (X30/18) 2.Measure resistance with multimeter between pins 2 and 2.1 (X30/18)
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 X30/18 (Left voltage distributor connector (CAN C))
- Test terminating resistor of component X30/18 (Left voltage distributor connector (CAN C)).
- Test terminating resistor of CAN element in control module N3/10 (ME-SFI [ME] control unit).
End of test

2.1.2.2.2.1.2. 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 X30/18 (Left voltage distributor connector (CAN C))
- Test terminating resistor of component X30/18 (Left voltage distributor connector (CAN C)).
- Test terminating resistor of CAN element in control module N3/10 (ME-SFI [ME] control unit).
End of test

2.1.2.2.2.2. Test terminating resistor of component X30/18 (Left voltage distributor connector (CAN C)).
Test terminating resistor of component X30/18 (Left voltage distributor connector (CAN C)).
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 X30/18 (Left voltage distributor connector (CAN C)) to component N3/10 (ME-SFI [ME] control unit)
- Component X30/18 (Left voltage distributor connector (CAN C))
End of test

2.1.2.2.2.3. 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

2.1.2.3. 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 X30/18 (Left voltage distributor connector (CAN C))
- Observe level voltage.
- Plug in connector again at connector strip X30/18 (Left voltage distributor connector (CAN C)).
- 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

- X30/18 (Left voltage distributor connector (CAN C))
- Test connectors and wiring for CAN of engine compartment CAN control modules.
- Control unit
Communication with ECU required ( Measuring system )

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