11BE00

The control deviation during rail pressure regulation via the pressure regulator valve is too high.


Possible cause:

- Check components of high pressure control circuit.
Affected functions:

- Power generation

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Test 1: Check low-pressure fuel circuit and high-pressure fuel circuit.

Test 2: Rail pressure monitoring via pressure control valve

1. Check low-pressure fuel circuit and high-pressure fuel circuit.
Check components of high pressure control circuit.
Note on fault setting conditions

- If one of the associated fault codes has the status 'CURRENT' or there is a customer complaint or stored faults with high frequency counter, then perform further tests.
- If the fault has occurred once and no customer complaint has been received, erase the fault memory.
- Before performing any further work, the fuel level when the fault occurred must be checked in the fault freeze frame data.
- Make sure that the vehicle was only refueled with diesel fuel.
Warning!

- Always observe the specified sequence of the component tests listed below.
Explanation of the following test

- The following tests check both the entire low-pressure fuel circuit and the high-pressure fuel circuit.
Communication with ECU required

2. Rail pressure monitoring via pressure control valve

Test 2.1: Fuel tank level ?

Test 2.2: Test of low pressure circuit

2.1. Fuel tank level ?
Possible cause and remedy

- Fuel tank level minimum:10Liters
End of test

2.2. Test of low pressure circuit
Warning!Risk of explosion, poisoning and injury!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 anaesthetizing 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.


Please check the fault freeze frame data.
Question:How high was the tank fill level when the fault occurred?Question:Read fault memory once again.

YES

2.2. No further information available.


NO
Question:Was the tank fill level > 10 l ?

YES
Test prerequisites:Tank fill level is > 10 l.Type of fuel (Diesel)The low pressure fuel circuit has no external leaks.Continue with button F2

Test pressure in fuel low pressure circuit.
Figure legend

- 043Pressure measuring device0-10 bar(103 589 00 21 01)
- a T-piece for pressure test upstream of fuel filter(A 620 990 03 70)
- b T-piece for pressure test downstream of fuel filter(A 673 990 03 70)

- Shop-make test lines as shown in picture.
- This test can also be carried out alternatively with a commercially available pressure-vacuum tester with an appropriate test connector.
- Hydraulic clutch: see Workshop Equipment Manual WH58.30-Z-1054-13A







Test fuel pressure at fuel filter inlet.
Special tool

- 043Pressure measuring device0-10 bar(103 589 00 21 01)
Figure legend

- 043Pressure measuring device
- 70/1Inlet at fuel filter
IMPORTANT NOTE

- Kinked or clogged fuel lines may result in fuel pressures of up to 8 bar.
- Fabricate your own hose lines with a diameter of 8 mm and 10 mm.
Test sequence

- Switch off ignition.
- Await run-on time.
- Connect test pressure gauge.[See fig.]
- Start and run engine at idle speed for approx. 15 s.
Communication with ECU required







NO
End of test