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  1. IB1

    IB1 New Member

    Messages:
    11
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    0
    Location:
    Leeds, UK
    I have a problem with the managment warning light permanently on. The Vauxhall garage say the ECU is going faulty and wanted megabucks for a new one. I sent the old unit away for testing / repair and it's come back with no faults found.

    Ive found a single fault code P0443 (using OBD11 scanner & pedal method) which points to the Evap purge valve. The valve seems fine - I removed it and checked operation with 12V - nice healthy click and I can blow through it.

    I can clear the fault with the scanner and it stays off for 2 or 3 engine starts, but then comes on again - just after starting.


    I put a meter on the connection to the valve ... nothing, although I heard it doesn't normally activate until the engine is warm and under load. But I dont think the valve is ever operating - no hiss from fuel tank filler when re-fueling.

    Does this point to a wiring fault? and if so can anyone let me know which connection on the ECU goes to the valve. Any other thoughts appreciated.


    Astra 1.8 16V - Z18XE engine. Year 2000/01

    Ian
     
  2. shuggy

    shuggy Member

    Messages:
    16
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    Location:
    Edinburgh
    the evap valve vents the tank at cruising speeds to burn the hydrocarbon vapour in the tank if it was stuck open it can cause idling issues also check the carbon canister for cracks if the ecu is not switching the valve it could be wiring or an ecu problem but also the solenoid in the valve may have a high resistance causing a fault code to be flagged .. best bet is to have it code read and if its a dedicated fcr like vaux com it can work the valve from the laptop. if it works the ecu may not be the problem ?
     
  3. IB1

    IB1 New Member

    Messages:
    11
    Likes Received:
    0
    Location:
    Leeds, UK
    Thanks Shuggy, Ill have a closer look at the canister after Christmas. The coil in the valve reads 28 Ohms which seems fine to me and operates OK on 12 Volts, I'd like to check the wiring from the valve to the Ecu but I can only find drawings for the X series engines.

    Ian
     
  4. gerinemo

    gerinemo Active Member

    Messages:
    917
    Likes Received:
    33
    Location:
    Dublin Ireland
    Drives:
    2000 Astra G Comfort
    Hi was just looking at the ecu manual that i have and only 1.8 listed for year 2000
    was x18xe (simtec 70 )
    but the book is only up to 2000 but if you know the ecu might have some info
    jd
    P0443 evaporative Emission control system purge control valve circuit malfunction
     
  5. aerojon

    aerojon Banned

    Messages:
    143
    Likes Received:
    0
    Location:
    north west
    check your cap is sealing properly...early saab 9-3SS had a problem with caps not sealing properly and throwing up an evap fault code...
     
  6. IB1

    IB1 New Member

    Messages:
    11
    Likes Received:
    0
    Location:
    Leeds, UK
    Thanks guys, the ecu is a Simtec 71 - maybe the pinout is the same as the 70 (I've got the drawings for that one!), the filler cap was replaced last year but I'll double check its OK.

    Have a good Christmas
     

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