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Home >> Mercedes Benz >> 2006 >> E 320 CDI (211.026) L6-3.2L DSL Turbo (648.961) >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> Manufacturer Code Charts >> 2021

Manufacturer Code Charts: 2021


[1] Rail pressure monitoring via pressure control valve: The rail pressure is too low.

Test 1: Rail pressure monitoring via pressure control valve

1. Rail pressure monitoring via pressure control valve

Test 1.1: Fuel tank level ?

Test 1.2: Test pressure in fuel low pressure circuit.

Test 1.3: Test fuel leak quantity of injectors.

Test 1.4: Test components Y74 (Pressure control valve) and Y94 (Quantity control valve).

1.1. Fuel tank level ?
Possible cause and remedy

- Fuel tank level minimum:10Liters
End of test

1.2. Test pressure in fuel 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

1.2. 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)
- aT-piece for pressure test upstream of fuel filter(A 620 990 03 70)
- bT-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 runon 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

1.3. Test fuel leak quantity of injectors.

Test 1.3.1: Test fuel leak quantity of injectors. / The engine does not start.

Test 1.3.2: Test fuel leak quantity of injectors. / The engine cuts out when accelerated.

1.3.1. Test fuel leak quantity of injectors. / The engine does not start.
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.


Test fuel leak quantity of injectors.
Special tool

- Injector tester A 611 589 01 21 00
- Injector tester A 611 589 04 21 00
Figure legend

- 54Leak oil pipes
- 117Matra clamp
- 118Test tubes
Test sequence

- Detach leak oil line at injectors.
- Seal off leak oil line with Matra clamp.
- Connect special tool A611 589 01 21 00 or A611 589 04 21 00 to the injectors.
- Unplug 3-pin connector from component B6/1 (Camshaft Hall sensor).
- Unplug 2-pin connector from component Y94 (Quantity control valve).
Continue with button F2

















Warning!Communication with ECU required.


1.3.2. Test fuel leak quantity of injectors. / The engine cuts out when accelerated.
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.


Test fuel leak quantity of injectors.
Special tool

- Injector tester A 611 589 03 21 00
- Injector tester A 611 589 04 21 00
Test sequence

- Detach leak oil line at injectors.
- Seal off leak oil line with Matra clamp.
- Connect special tool A611 589 03 21 00 or A611 589 04 21 00 to the injectors.
Continue with button F2

















Important note:If the engine is switched off during the test due to overflowing test pipes, the injectors of the affected cylinder must be replaced. This test must then be repeated.Continue with button F2

Warning!Communication with ECU required.


1.4. Test components Y74 (Pressure control valve) and Y94 (Quantity control valve).
Check component Y94 (Quantity control valve).
Switch off engine.Await running-on time of 4 s.Start engine.

- The engine limit speed must be reached '2 times within 30 s.
- Hold engine limit speed for approx. 3 s.
Status of the relevant actual values:
- Engine speed:Warning! Communication with ECU required.
Communication with ECU required

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