2010 Mercedes Benz C 300 4MATIC (204.081) V6-3.0L (272.948)
A L L Diagnostic Trouble Codes ( DTC ): P Code Charts P0627
The fuel pump is malfunctioning or has an open circuit.
Test 1: Check component M3 (Fuel pump).
Test 2: Test control signal for component Fuel pump.
Test 3: Signal wire PWM signal Fuel pump
Test 4: Check power supply at control unit N118 (Fuel pump control module).
Test 5: Possible cause:
- M3 (Fuel pump) - N118 (Fuel pump control module) Affected functions:
- Engine diagnosis - Fuel system
1. Check component M3 (Fuel pump).
Test 1.1: Test fuel pressure and internal leaks of fuel system.
Test 1.2: Test delivery of component M3 (Fuel pump).
Test 1.3: Check power consumption of component M3 (Fuel pump) using actual value.
Test 1.4: Test the cables from component N118/3 (Left fuel pump control unit) to component M3 (Fuel pump) with the plug connection M3x1 (Fuel pump connector) between the two.
1.1. Test fuel pressure and internal leaks of fuel system. Warning!Communication with EC reuired.
1.2. Test delivery of component M3 (Fuel pump). Figure legend
- 043Pressure gage(103 589 00 21 00) - 055aMeasuring beaker(Min.:2 Liters) - 055Measuring beaker - 069Pressure hose(119 589 04 63 00) Preparation for test
- Switch off ignition. - Connect test pressure gauge. - Release fuel pressure. - Separate fuel feed hose at the fuel line and hold in a suitable measuring beaker. - Switch on ignition. 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 2
Warning!Communication with EC reuired.
1.3. Check power consumption of component M3 (Fuel pump) using actual value. Warning!Communication with EC reuired.
1.4. Test the cables from component N118/3 (Left fuel pump control unit) to component M3 (Fuel pump) with the plug connection M3x1 (Fuel pump connector) between the two. Test prerequisite
- A fault has occurred during current measurement at component M3 (Fuel pump). Test sequence
- Switch off ignition. - Unplug 6-pin connector from component N118/3 (Left fuel pump control unit). - Unplug coupling A at component rack M3x1 (Fuel pump connector). - Check lines to component M3 (Fuel pump) for short and open circuits. Was the test o.k.?
2010 Mercedes Benz C 300 4MATIC (204.081) V6-3.0L (272.948) Copyright ? 2013, ALLDATA 10.52SS Page 3
YES The test was okay.End of test
NO The test was not okay.Possible cause and remedy
- Repair cable, or replace if necessary. End of test
2. Test control signal for component Fuel pump. 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).
2010 Mercedes Benz C 300 4MATIC (204.081) V6-3.0L (272.948) Copyright ? 2013, ALLDATA 10.52SS Page 4
Test sequence
- Switch off ignition. - Connect socket box (126-pin) to component N3/10 (ME-SFI [ME] control unit). - Measure direct current with multimeter between sockets [F.4] 100 and [F.8] 104 of the 126-pole socket box tester. - Switch on ignition. Specified value
- Amperage[13...18] mA 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
- Check control line to component N118/3 (Left fuel pump control unit) for Short circuit or open circuit. Further possible remedies
- Read fault memories of the control units N118/3 (Left fuel pump control unit) and N3/10 (ME-SFI [ME] control unit).
3. Signal wire PWM signal Fuel pump 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).
2010 Mercedes Benz C 300 4MATIC (204.081) V6-3.0L (272.948) Copyright ? 2013, ALLDATA 10.52SS Page 5
Test sequence
- Switch off ignition. - Connect socket box (126-pin) to component N3/10 (ME-SFI [ME] control unit). - Measure direct current with multimeter between sockets [F.4] 100 and [F.17] 113 of the 126-pole socket box tester. - Switch on ignition. Specified value
- Amperage[15...20] mA Question
- Is the measurement value OK?
YES The measurement value is OK.Other possible cause of fault
- 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.. - B4/15 (Fuel pressure sensor) End of test
NO The measurement value is not OK.Possible cause and remedy
- Check lines to components N3/10 (ME-SFI [ME] control unit) and N118/3 (Left fuel pump control unit) as per wiring diagram. Further possible remedies
- Read fault memories of the control units N118/3 (Left fuel pump control unit) and N3/10 (ME-SFI [ME] control unit).
4. Check power supply at control unit N118 (Fuel pump control module). Possible cause and remedy
- Test fuse, replace if necessary Question
- Is fuse OK?
YES Test prerequisite
2010 Mercedes Benz C 300 4MATIC (204.081) V6-3.0L (272.948) Copyright ? 2013, ALLDATA 10.52SS Page 6
Test sequence
- Switch on ignition. - Unplug 4-pin connector from component N118 (Fuel pump control module). - Measure voltage at the unclipped cable.(Ground- Positive) - Measure direct voltage with multimeter between sockets (N118) 1.2 and (N118) 1.1 Specified values
- Voltage: [11.0 ... 14.5] V Question
- Is the measurement value OK?
YES The measurement value is OK.Further possible causes of fault
- Inspect plug connections for corrosion, pinched insulation and loose contact. End of test
NO The measurement value is not OK.Possible cause and remedy
- Inspect lead of voltage supply to control module N118 (Fuel pump control module) if necessary for loose contact, damage and corrosion and repair. End of test
NO Replace faulty fuse.End of test
5. No further information available.
