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Thread: eml light on after 70+ loss of power, code p1125

  
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    eml light on after 70+ loss of power, code p1125

    hello. my edu recently broke on ma van i got a second hand one fitted it all was fine for 75 miles. now when ever i go over 70 sometimes 80 or 90 the eml light comes on and i loose power. sometimes it stays on while driving and sometimes it goes off this has gone on for 400 miles now and still i cant find the problem. the ecu code is p1125 which on autodata says is the (turbocharger (tc) wastegate regulating valve).
    anyone had this problem or a similar one so i can try to work it out.
    cheers adam

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    Is it the ECU that was replaced and if so is it the 1.7L DOCH engine with the ECU sitting directly on top of the engine?

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    no its was the edu i replaced it bolts on top of the diesel pump. yeah its on a 2001 1.7 dti with ecu on top.

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    Adam
    Check the wiring to the charge pressure sensor. The charge pressure wasegate is controlled by the ECU via a solenoid valve. The wastegate is designed to bypass the turbo when overboost protection is required. If the sensor or its associated wiring is at fault the wasetgate will not open and the ECU will enter back up mode which will alow the engine to run in reduced performance mode and will illuminate the dash light and store the fault code. Looks like it could be an intermittant fault during the driving conditions you discribe. It would be a good idea to check all wiring connections and clean them with a suitable switch cleaner before replacing any parts.

    Spedo

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    hello. that sounds like a good thing to check because i was running out of ideas. where is this sensor located and what does it look like.
    cheers

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    1. Remove the air cleaning ducting at the rear of the engine compartment
    2. Remove the exhaust gas recirculation solenoid valve from the inlet
    manifold. (Right hand side of the inlet manifold pull off the two vacuum
    hoses and note differing diamiter for refit. Pull out the connector wire,
    then undo the two retaining bolts.)
    3. Disconnect the wiring loom from the charge pressure sensor, undo the
    bolts to remove it.

    NB. If time is more important than money just replace the charge pressure switch as a matter of course this will definatly rule it in or out. Also check the condition of all wires, plugs and vacuum hoses.

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    ok i will have a go tomorrow. should i do it with the battery disconnected or does it not matter. which is the egr solenoid valve what does it look like. and what does the charge pressure sensor look like. thanks for your help.

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    Charge pressure small flatish black plastic sensor.
    Gas recurculation solinoid sits on top of the inlet manifold with two flexible vacume hoses.

    My strongest advice to you would be to invest in a Haynes Manual as you will always find sutble variances in the way things look. Its good that you are up to the challenge but its always good to be well prepaired before you start.

    Let us know how you eventually fix the problem so w can all learn. Good luck Spedo.

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    yeah that could be a good idea. well im always up to the challenge dont trust garages and im mechanicly minded. just when it comes to ecu's and electrics i get stuck. yeah sure will cheers for the help

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    This is an issue with the crank shaft position sensor.. It has been written about loads on here and i had it with my last 1.7DTi. Exactly the same problem as you with speeds above 70+ and the same error code.

    Can be bought from here for £23.33
    http://www.autovaux.com/LoadPortal.a...bid=5&vnum=128

    And is located on the back on the engine block, just above the driveshaft by the starter motor. Held in by one bolt and is easily changed.



    Hope this helps...
    No longer a Astra Owner
    Now Drives -2006 Skoda Octavia vRs in Race Blue

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