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Thread: Fault Code Help!

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    Fault Code Help!

    Ran VCDS and got some fault codes up, anyone shed any light what they are??

    17994 - Engine Mount Solenoid Valves (N144/N145): Short to Plus
    P1586 - 35-10 - - - Intermittent

    17965 - Charge Pressure Control: Positive Deviation
    P1557 - 35-00 - -

    00819 - High Pressure Sensor (G65)
    29-00 - Short to Ground

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    I know what the codes are, I don't know what they mean ie charge pressure control?

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    G65 = AC refrigerant high pressure sensor ... if in your shoes check wiring to it, if AOK my next step would be replacement ...

    N144/145 = Engine Hydro mountings left/right ... if in your shoes check wiring to it, if AOK my next step would be replacement ...

    Quote Originally Posted by Kyle. View Post
    17965 - Charge Pressure Control: Positive Deviation
    P1557 - 35-00 - -
    Possible Causes
    • Boost Pressure too High
    • Hoses/Pipes incorrect connected, disconnected, blocked or leaking
    • Charger Pressure Control defective
      • VNT (variable nozzle turbo): nozzles stuck
    • Solenoid Valve for Boost Pressure Control (N75) defective
    Above extract from Link:- 17965/P1557/005463 - Ross-Tech Wiki

    Charge pressure is being detected higher than ECU require, thus fault logged ...

    There maybe measuring blocks which may help you ... here is a link to a set Link:- Audi Portal: ECU Diagnostic . Audi A4 8E (2001-2008) . Engine Control Unit J248

    From your previous posts you have a 2002 A4 1.9 TDi 130 ... can you confirm Saloon/Avant/Cabriolet? engine code? perhaps another can give you more insight ...

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    Ive got a saloon pd130

    what does the engine mount one mean?

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    First of all, clear the faults and then check again after a few engine cycles. If the faults reappear then the are definite faults.

    The engine mount is electro-hydraulic which means an electrical signal is applied to the mount to alter the hydraulic "firmness". It means that engine vibration is better damped throughout the rev range. Common failures on the b6 and unless your engine is noticeably rattling about, don't worry about it. It's the passenger side mount that has the electrical connection. OE mounts are about £100.

    The G65, as said above, is for the air con. The sensor is located on the air con condenser, the smaller forward radiator on the front of the car, passenger side. If the wiring checks out then a new sensor will cost you about £30-£40. If you press the ECON button on your A/C control and the red light fails to go out then this is a definite hard fault. It could also mean that the air con system needs regassing, hence no pressure in the system. This can be checked in VCDS in HVAC measuring blocks.

    Positive charge pressure is an overboost from the turbo. The VNT vanes within the turbo have failed to open when required boost has been reached. This will likely cause the engine to go into Limp Mode which should clear with an ignition cycle. The possible causes have been listed above. Personally, I would try the Mr Muscle trick and check the integrity of the vacuum hoses. Then consider a replacement N75 valve (controls the turbo actuator arm that opens/closes the turbo vanes) approx £40. If you have a registered version of VCDS, you can perform Engine Output Tests, one of which is the N75 and the actuator arm can be observed for free and smooth movement if you stick your head under the bonnet.
    Last edited by Audi Doodah; 9th May 2013 at 16:53.
    gupsterg likes this.
    A4 Avant 1.9 TDi Sport GmbH

 

 

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