2010 Mercedes Benz C 300 4MATIC (204.081) V6-3.0L (272.948)
A L L Diagnostic Trouble Codes ( DTC ): Manufacturer Code Charts 0551
G3/6 (Right O2 sensor, after TWC [KAT]) : Discontinuity of signal line (P0140)
Possible cause:
- G3/6 (Right O2 sensor, after TWC [KAT]) - N10/1kI (Circuit 87 relay, engine) - N10/1f57 (Fuse 57) - Voltage supply via component Z7/36 (Circuit 87 M2e connector sleeve) Affected functions:
- Engine diagnosis - Exhaust system
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Test 1: Check power supply of component N3/10 (ME-SFI [ME] control unit).
Test 2: Arrangement of fuses
Test 3: Power supply
Test 4: Check component G3/6 (Right O2 sensor, after TWC [KAT]).
1. Check power supply of component N3/10 (ME-SFI [ME] control unit).
Test 1.1: Test voltage supply of circuit 87. ( Check using actual value )
Test 1.2: Test voltage supply of circuit 30.
Test 1.3: Test voltage supply of circuit 87.
Test 1.4: Test current consumption of component N10/1kR (Circuit 87 relay, engine).
Test 1.5: Test voltage supply of circuit 15.
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.
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
2010 Mercedes Benz C 300 4MATIC (204.081) V6-3.0L (272.948) Copyright ? 2013, ALLDATA 10.52SS Page 2
- 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
2010 Mercedes Benz C 300 4MATIC (204.081) V6-3.0L (272.948) Copyright ? 2013, ALLDATA 10.52SS Page 3
1.3. Test voltage supply of circuit 87. 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 87.
Test sequence
- Measure direct voltage with multimeter between sockets [ F.2 ] 98 and [F.3] 99 of the 126-pole socket box tester. - Measure direct voltage with multimeter between sockets [ F.4 ] 100 and [ F.5 ] 101 of the 126-pole socket box tester. - Measure direct voltage with multimeter between sockets [ F.6 ] 102 and [ F.5 ] 101 of the 126-pole socket box tester. - Switch on ignition. Specified value
2010 Mercedes Benz C 300 4MATIC (204.081) V6-3.0L (272.948) Copyright ? 2013, ALLDATA 10.52SS Page 4
- Voltage[11.0...15.0] V Question
- Are the measurement values OK?
YES The measurement values are OK.Further possible causes of fault
- Test voltage supply of circuit 30.
NO The measurement values are not OK.Possible cause and remedy
- N10/1f43 (Fuse 43) - N10/1f44 (Fuse 44) - N10/1kI (Circuit 87 relay, engine) - Lines - N10/1 (Driver-side SAM control unit with fuse and relay module) End of test
1.4. 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
2010 Mercedes Benz C 300 4MATIC (204.081) V6-3.0L (272.948) Copyright ? 2013, ALLDATA 10.52SS Page 5
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
1.5. 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
2010 Mercedes Benz C 300 4MATIC (204.081) V6-3.0L (272.948) Copyright ? 2013, ALLDATA 10.52SS Page 6
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
2. Arrangement of fuses Figure legend/figure
2010 Mercedes Benz C 300 4MATIC (204.081) V6-3.0L (272.948) Copyright ? 2013, ALLDATA 10.52SS Page 7
- N10/1 (Driver-side SAM control unit with fuse and relay module) Fuses
- FuseF43-F67 Relays
- I =N10/1kI (Circuit 87 relay, engine) - K =N10/1kK (Circuit 87 relay, chassis) - L =N10/1kL (Starter relay) - M =N10/1kM (SEQ [ASG] pump control relay) - N =N10/1kN (Circuit 15 relay) - O =N10/1kO (FAN relay module) - P =N10/1kP (Circuit 15R relay) - R =N10/1kR (Air pump or oil cooler fan relay)
3. Power supply Voltage supply via component Z7/36 (Circuit 87 M2e connector sleeve)
Possible cause and remedy
- Check voltage supply according to wiring diagram.
4. Check component G3/6 (Right O2 sensor, after TWC [KAT]). Warning!Communication with ECU required.
