2010 Mercedes Benz C 300 4MATIC (204.081) V6-3.0L (272.948)
A L L Diagnostic Trouble Codes ( DTC ): Manufacturer Code Charts 0321
The inection valve output stage of cylinder 5 detects a short circuit to positive. (P0274)
Possible cause:
- Y62y5 (Fuel inector cylinder 5) Affected functions:
- Engine diagnosis - Engine running
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Test 1: Check component Y62y5 (Fuel inector cylinder 5).
1. Check component Y62y5 (uel inector cylinder 5).
Test 1.1: Check component Y62y5 (Fuel inector cylinder 5).
1.1. Check component Y62y5 (uel inector cylinder 5). Safety note Warning!Risk of explosion poisoning and inury!Fuels are highly inflammable and toxic if inhaled. Fuels may cause skin damage. fuel vapors are explosive invisible and spread out at floor level they are toxic if inhaled and produce giddiness and an anaesthetiing effect.Rules of conduct and protective measures
- Wear suitable protective clothing. - Pay attention to national safety precautions and regulations. - No fire sparks naked flames and smoking. - Ensure the work place is adequately ventilated. - Never drain or pour in fuels over assembly pits. - Store drained fuel in a suitable and sealed vessel. - Immediately eliminate any fuel which has flowed out. First-aid measures
- Clean moistened skin with water and soap. - Change moistened clothing as quickly as possible. - If fuel gets into your eyes rinse out your eyes immediately with water and contact a doctor if necessary.
Test 1.1.1: Test actuation of component Y62y5 (Fuel inector cylinder 5).
Test 1.1.2: Test signal voltage of component Y62y5 (Fuel inector cylinder 5).
Test 1.1.3: Check internal resistance of component Y62y5 (Fuel inector cylinder 5).
Test 1.1.4: Inspect component Y62y5 (Fuel inector cylinder 5) for leaks.
Test 1.1.5: Inspect operation and spray pattern of component Y62y5 (Fuel inector cylinder 5).
1.1.1. Test actuation of component Y62y5 (uel inector cylinder 5). Test prerequisite
- Coolant temperature > 80° C - Engine RUNNIN
Warning!Communication ith EC reuired.
1.1.2. Test signal voltage of component Y62y5 (uel inector cylinder 5). 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 sequence
- Switch off ignition. - ConnectionMeasuring system - Observe oscilloscope pattern between sockets [M.26] 26 and [F.3] 99 of the 126-pole socket box tester. - Run engine. Note
- Measuring system:Communication with ECU required
1.1.3. Check internal resistance of component Y62y5 (uel inector cylinder 5). 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 3
Test sequence
- Switch off ignition. - Connect socket box (126-pin) to component N3/10 (ME-SFI [ME] control unit). - Measure resistance with multimeter between sockets [M.26] 26 and [F.3] 99 of the 126-pole socket box tester. Specified value
- Resistor[11...1]ohms 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..
NO The measurement value is not OK.Test sequence
- Switch off ignition. - Connect shop-made test cable set to component Y62y5 (Fuel inector cylinder 5). - Measure resistance with multimeter between pins (Y62) 1 and (Y62) 2 Specified value
- Resistor[11...13]ohms Question
- Is the measurement value OK?
YES The measurement value is OK.Possible cause and remedy
- Lines to component Y62y5 (Fuel inector cylinder 5)
NO The measurement value is not OK.Possible cause and remedy
2010 Mercedes Benz C 300 4MATIC (204.081) V6-3.0L (272.948) Copyright ? 2013, ALLDATA 10.52SS Page 4
- Y62y5 (Fuel inector cylinder 5)
1.1.4. Inspect component Y62y5 (uel inector cylinder 5) for leaks. 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
Figure legend
- 055Measuring beakerY62 (Fuel inectors) Test sequence
- Switch off ignition. - Remove fuel rail together with component Y62y5 (Fuel inector cylinder 5). - Bridge between sockets (F.4) 100 and (F.1) 113 of the 126-pole socket box tester. - Switch on ignition. Specified value
- Component Y62y5 (Fuel inector cylinder 5) must not drip. Question
- Was the test o.k.?
2010 Mercedes Benz C 300 4MATIC (204.081) V6-3.0L (272.948) Copyright ? 2013, ALLDATA 10.52SS Page 5
YES The test was okay.Further possible causes of fault
- Inspect operation and spray pattern of component Y62y5 (Fuel inector cylinder 5).
NO The test was not okay.Possible cause and remedy
- Y62y5 (Fuel inector cylinder 5)
1.1.5. Inspect operation and spray pattern of component Y62y5 (uel inector cylinder 5). 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
Figure legend(Shop-made tool)
- 1xClutch 140 545 35 28 - 2xContact spring 004 545 56 26 - 1xRed banana connector - 1xBlack banana connector - 22 mRed cable with diameter 15 mm(Pin 1) - 22 mBrown cable with diameter 15 mm(Pin 2) - 2 mInsulation sheathing with diameter 6 mm
Test sequence
- Switch off ignition. - Remove fuel rail together with component Y62y5 (Fuel inector cylinder 5). - Bridge between sockets (F.2) 98 and (F.1) 113 of the 126-pole socket box tester. - Switch on ignition. - Component M3 (Fuel pump) runs. - old component Y62y5 (Fuel inector cylinder 5) in a vessel and briefly operate manually with shop-made test cable set at sockets 98 and 99 of the 126-pin socket box. Specified value
- Fuel inectors should eect fuel uniformly. Question
- Was the test o.k.?
2010 Mercedes Benz C 300 4MATIC (204.081) V6-3.0L (272.948) Copyright ? 2013, ALLDATA 10.52SS Page 7
YES The test was okay. End of test
NO The test was not okay.Possible cause and remedy
- Y62y5 (Fuel inector cylinder 5) End of test
