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[Solved] Volkswagen - 1.9 diesel engine shakes, unit injector error ??

przemyslw 24645 10
Best answers LABEL_AI_GENERATED

Why does my 1.9 diesel engine shake and show fault 18075/P1667 for cylinder 2 unit injector?

The most likely cause is an electrical fault in the cylinder 2 unit-injector circuit: check the wiring and connectors under the valve cover, the unit injector coil, and the engine controller, because 18075/P1667 is a “valve for pump-jet cylinder 2” electrical malfunction [#17070021] Remove the valve cover and squeeze/clean the injector plugs, since loose contacts were specifically suggested and later found to be the practical problem [#17067029][#17084763] Use measuring blocks 018 and 023 as diagnostics: block 018 should be 0, while block 023 can help indicate fuel supply problems, air in the fuel system, or injector sticking, and block 023 is also influenced by shaft wear and injector adjustment [#17070021][#17078607] If block 023 shows values near the lower limit, check the fuel supply system; if near the upper limit, suspect a sticking unit injector after confirming fuel supply [#17070021] Also verify tandem pump pressure, which should be at least 3.5 bar at 1500 rpm [#17070021] In this thread, pressing/fixing the injector connectors solved the shaking and the car ran normally again [#17084763]
AI summary based on the discussion. May contain errors.
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  • #1 17066864
    przemyslw
    Level 15  
    Posts: 191
    Help: 6
    Rate: 86
    Hi . Whether it's at low speed or high, it breaks it off. The fuel is there, the filter is new, the fuel lines are a bit old? As if fuel is leaking out?
    For the first time in my life, I did a test:
    VCDS-Lite Version: Release 1.2 - unfortunately not the full version.
    And I don't know if I'm doing it right ??
    It showed:
    5 Faults Found:
    17571 - Fuel Temp Sensor (G81): Open or Short to Plus
    P1163 - 35-00 - Fuel temperature sensor
    16705 - Shareware Version. It's Decode all DTCs
    P0321 - 35-00 - Engine speed sensor
    18075 - Shareware Version. It's Decode all DTCs
    P1667 - 35-10 - Pump valve - Jet: Cylinder 2
    16686 - Cylinder 2: Misfire Detected
    P0302 - 35-10 - Cylinder misfire detected
    17978 - Shareware Version. It's Decode all DTCs
    P1570 - 35-00 - Engine Start Blocked by Immobilizer
    After deleting and restarting, the only error left was:
    18075
    and then downloaded the logs

    http://vaglogi.pl/log-013_023_018_4Z40t.html
    http://vaglogi.pl/log-013_004_018_i92DY.html
    http://vaglogi.pl/log-013_023_018_v417qw.html
    http://vaglogi.pl/log-018_gBejWK.html
    http://vaglogi.pl/log-023_001_018_5UvYn.html
    http://vaglogi.pl/log-004_013_018_gUGLV.html
    I am far from the site.
    Please help
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  • Helpful post
    #2 17067029
    Doktorr
    Level 35  
    Posts: 2430
    Help: 287
    Rate: 1098
    First, remove the valve cover and squeeze the plugs at the unit injectors. Sometimes using the full version of the diagnostic hardware can save a lot of money.
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  • #3 17067705
    przemyslw
    Level 15  
    Posts: 191
    Help: 6
    Rate: 86
    In this state it is better not to go to the site ?? The equipment is not mine but showing in group 18 the same 14 and in group 23 the same zero, regardless of the engine speed, does something tell you?
  • #4 17069252
    Doktorr
    Level 35  
    Posts: 2430
    Help: 287
    Rate: 1098
    It says you have hardware in demo, which is without a lot of features. If you don't feel up to it, put it in the workshop.
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  • #5 17069463
    przemyslw
    Level 15  
    Posts: 191
    Help: 6
    Rate: 86
    With the workshop as it was, it would be so easy, it would be ... done. Because it's urgent. I don't know if it's a demo version, I'm still learning. Now I can take more measurements. I'll take the cover off. And is showing in group 18 the same 14 and in group 23 the same zero, regardless of engine speed, tell you something?
  • Helpful post
    #6 17070021
    Doktorr
    Level 35  
    Posts: 2430
    Help: 287
    Rate: 1098
    Full version 18075 / P1667 - Valve for Pump - Jet: Cylinder 2 (N241): Electrical Malfunction
    i.e. cables, unit injector coil, engine controller (most often what I wrote in previous posts)


    For educational purposes:

    Measured value block 023 (correction of the time torque of the electric unit injector control)

    average value . set point -100 ... +100 ms (for AZV even 150 ms). However, if the motor is working incorrectly, values outside the range of -60 ... +60 ms can be a symptom of a fault.

    - If the value of . the correction is close to the lower limit (and amounts to eg: -75), then it may be suspected . a problem with fuel supply. In this case, check . the entire power system according to the "Repair Manual".

    - If the value . is close to the upper limit (eg: +75), this indicates a jamming of the unit injector or poor fuel quality. After confirming the correct fuel supply, replace only the unit injector for which the read value is too high. The remaining unit injectors must not be changed.

    Measured value block 018
    -should be the status of pump injectors. 0 - it is OK, but any other number means damage to the unit injector, break in the continuity of the circuit, lack of fuel, air in the fuel system.

    Measured value block 013
    -4th gear - accelerate from very low revs to max gas, you can view the pumps up to 1600 rpm the one that suddenly increases the deviation in plus sucks,

    The pressure on the tandem pump is to be at least 3.5 bar at 1500 rpm.
  • Measured blocks 018 and 023 indicate injector fault

    #7 17070420
    przemyslw
    Level 15  
    Posts: 191
    Help: 6
    Rate: 86
    przemyslw wrote:
    Measured value block 018
    -should be the status of pump injectors. 0 - it is OK, but any other number means damage to the unit injector, break in the continuity of the circuit, lack of fuel, air in the fuel system.

    And I have the same 14, so the damage is probably, as you advised, el terminals. under the cover.
    Unfortunately, removing the cover is a big problem - no access, and I don't want snow blowing on me.
    I'm reading http://sprawdz.auto.pl/diagnostyka-pompowtryskow-w-silniku-1-9tdi/

    In the 018 group we should expect only 0, as it is not so quickly we look at the list:
    000 correct adjustment
    002 control during start-up
    004 low injection dose or valve closed
    008, the maximum current value has been reached
    016 BIP outside the control window (e.g. +/- 100 us)
    032 sampling number too small
    064 processing error
    128 BIP recognition (start of injection moment) was impossible
    Group 023:

    Group 023 means unit injection response time to electrical impulse. Negative values may indicate a failure of the fuel system, it is worth checking the fuel filter and fuel supply system. Push-ups response delays for 1.9tdi should be in the range and for 2.0tdi .

    And with me:
    group 18 ma14
    group23 is 00
  • #8 17078468
    przemyslw
    Level 15  
    Posts: 191
    Help: 6
    Rate: 86
    There were 2 'mechanics' with 4 computers and no errors :( and 5 errors on my cable and laptop :) .. I have to be hard on my own. On the 5-pin socket (at the head), one circuit strangely showed not 0.6 ? but 17 ? and sometimes 1300 ?. So I took off the cover and the stiff wires. How to pull out the connectors to bend them?
    About 0.5 to 0.7 ? on unit injectors
  • Helpful post
    #9 17078607
    jurekk55
    Level 36  
    Posts: 3698
    Help: 182
    Rate: 1580
    1) Do you have an adapter, clean? Efficient? If the installation works, you may have a problem with the driver.
    2) What you see in group 023 is also dependent on shaft wear and unit injection adjustment
    3) The operating temperature may influence the electrical fault of the injector itself.
  • Loose unit injector connector caused misfire

    #10 17084763
    przemyslw
    Level 15  
    Posts: 191
    Help: 6
    Rate: 86
    Is the VAG cylinder description the same as the cylinder duty cycle: 1 3 4 2 - from the timing?
    I pressed the connectors with a skewer, but it's best to buy new ones and solder.
    Works beautifully when folded. Another error popped up. You have to go for a ride.
    My theory of the wheel was unbalanced, the car drove on rough roads, quite a lot of mileage and that's why the connector on the unit injection was loosened. Thank you for your help.
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  • #11 17209563
    przemyslw
    Level 15  
    Posts: 191
    Help: 6
    Rate: 86
    Since 2 months it works, everything is ok.

Topic summary

LABEL_AI_GENERATED
The discussion revolves around issues with a Volkswagen 1.9 diesel engine, specifically related to shaking and unit injector errors. The user reports multiple fault codes from a VCDS-Lite diagnostic tool, including problems with the fuel temperature sensor, engine speed sensor, and cylinder misfire. Suggestions include checking the unit injector connections, verifying the fuel supply system, and considering the use of a full diagnostic version for better insights. The user also discusses the challenges of accessing the engine components and the importance of proper electrical connections. After some troubleshooting, the user notes improvements in engine performance.
AI summary based on the discussion. May contain errors.
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