Can anyone solve this odd issue?

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Thread: Can anyone solve this odd issue?

  1. #1

    Can anyone solve this odd issue?

    This is my first post on here and it's quite a complex one I'm afraid! I hope someone out there can help me.

    I have a 2003 9-3 Aero 2.0T petrol at 108,000 miles. My car has recently developed some sort of intermittent computer malfunction. On the motorway the other day I was cruising at no more than 75mph and the check engine light came on and I lost all power. By the time the revs got to about 1200rpm the engine shut itself off. Luckily I managed to roll onto the hard shoulder and stop safely. When I tried to start the engine again it made no attempt to even try, the computer was stopping it. So I called my breakdown and he cleared the fault and said it was an O2 sensor and probably just a glitch. I carried on driving and no problems for the next 150 miles.
    This morning I tried to start it from cold and although this time the battery tried to start it, it didn't. On a 2nd attempt the computer again didn't even allow the battery to try. I called my breakdown out again, he cleared the code and said it was some "internal memory malfunction" or something along those lines. He told me GM cars don't like the cold and it was probably a glitch. He advised me that if it happened again I could disconnect the battery wait a few minutes then reconnect to clear the problem.

    About 30 miles later (same journey) I was travelling at about 50 mph and the same thing happened as the first time. Light came on, lost power. I tried to change gear to take a sharp left to get me off the main road but when the revs dropped the engine cut out and ended in the gateway to a field.. I was not amused. Desperate to get home I didn't bother calling my breakdown and just disconnected the battery and carried on my way. The rest of my journey (100 miles) was trouble free.

    Does anyone know what on earth this could be and how I can fix it?
    If I take it to a garage then the car will obviously be running, therefore no engine management light will be on, so not sure how they could possibly find the problem.

    Any ideas are gratefully appreciated!
    Many Thanks
    JJN

    P.S I have a brand new battery, new starter motor and the MOT found no problems 3 weeks ago.
    There is also a 'tapping' noise coming from the engine when it started from cold but disappears after 30 seconds.

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  3. #2
    Administrator aerojon's Avatar
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    Re: Can anyone solve this odd issue?

    Welcome to SS..we need a fault code to point you in the right direction,what you're describing sounds like the cps is failing,but code/s for proper diagnosis..
    My 9-3 audio,2 x cd changers,aux-in & Bluetooth audio streaming..

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  4. #3

    Re: Can anyone solve this odd issue?

    ^^^^Yup, a lambda sensor failure might put it into limp home mode but not stop the car altogether.

    We do not stop playing because we grow old; We grow old because we stop playing.

  5. #4

    Re: Can anyone solve this odd issue?

    Quote Originally Posted by aerojon View Post
    Welcome to SS..we need a fault code to point you in the right direction,what you're describing sounds like the cps is failing,but code/s for proper diagnosis..
    Hi there,
    I've been driving my car fine for the last few days, no issues at all. However this afternoon it cut my engine whilst driving. I've got an OBDII reader and got code P0601 - "internal control memory check sum error". A brief Google search suggests the ECU. Is that the issue?
    If so, do you know how I can get this fixed / where I can get this fixed / and roughly how big will it be to get fixed?

    Many Thanks

  6. #5
    Administrator aerojon's Avatar
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    Re: Can anyone solve this odd issue?

    P0601 is the death code(RAM/ROM Fault)for the ecu..only cure is another ecu..
    My 9-3 audio,2 x cd changers,aux-in & Bluetooth audio streaming..

    Buy cheap pay twice..

  7. #6

    Re: Can anyone solve this odd issue?

    Quote Originally Posted by aerojon View Post
    P0601 is the death code(RAM/ROM Fault)for the ecu..only cure is another ecu..
    I was worried you might say that! I've read that you can divorce/marry second hand ECU's.. Is this safe? Or should I be going to a Saab specialist? Any idea on costs?

  8. #7
    Administrator aerojon's Avatar
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    Re: Can anyone solve this odd issue?

    you can fit used ecu's..to be on the safe side get the vin of the donor car..is your's a 03 or 53 plate car..
    My 9-3 audio,2 x cd changers,aux-in & Bluetooth audio streaming..

    Buy cheap pay twice..

  9. #8

    Re: Can anyone solve this odd issue?

    It's a 53 (October).
    I'm not very good at all this mechanic stuff! So I would need to find another 53plate aero manual 4dr in a scrap yard somewhere? And then find a mechanic with tech2 equipment to marry it?
    That sounds like it could be hard work. Don't suppose you know of anywhere I can trust near the Portsmouth ish area do you?

  10. #9
    Saabisti
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    Re: Can anyone solve this odd issue?

    Try ebay, look for matching numbers, I got mine for < £70 for my TID delivered to my door.
    Also you might find a tech2 specialist on ebay/gumtree...

  11. #10
    Administrator aerojon's Avatar
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    Re: Can anyone solve this odd issue?

    MY04-06 T8 ecu's are the same pt#,the software for the engine is put on using tech2...so when you buy a used ecu you need to make sure the car it came off has the same engine as yours B207R...MY07 onwards T8 ecus are different and can't be used on MY03-06 cars..
    My 9-3 audio,2 x cd changers,aux-in & Bluetooth audio streaming..

    Buy cheap pay twice..

  12. #11

    Re: Can anyone solve this odd issue?

    You used two different years in your example. MY04 or MY03 to MY06 have the same ECU's? How easy is it to find them? I don't know the first thing about car mechanics so trying to find a new 'brain' to my car sounds a bit out of my depth.

  13. #12

    Re: Can anyone solve this odd issue?

    Also when looking online there seem to be different names for different types of ECU. Isn't an ECU just and ECU or are there variants? e.g. a lot of sites ask if you want a fuel ECU or a central locking ECU. Like I said, I'm not very good at the car talk!

  14. #13
    Administrator aerojon's Avatar
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    Re: Can anyone solve this odd issue?

    MY03 was the only yr the sai valve and pump were fitted,MY04 onwards it was removed from the B207 engine..Saab Trionic 8 ecu
    Last edited by aerojon; 12-08-2014 at 10:29 AM.
    My 9-3 audio,2 x cd changers,aux-in & Bluetooth audio streaming..

    Buy cheap pay twice..

  15. #14
    Saab Afficionado
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    Re: Can anyone solve this odd issue?

    There is a good chance this is a match however you should really take your own ECU module out of the car and check the part numbers first.
    IMHO this would be a good thing to do anyway as you can clean and inspect all the connections on the ECU before putting it back.

  16. #15
    Saabisti
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    Re: Can anyone solve this odd issue?

    It may also be worth pulling the cover off the ECU and looking for water ingress. Its usually seen by a white powdery deposit on the circuit board. If you find any gently remove it using contact cleaner and a stiff brush. Then let it thoroughly dry before refitting (contact cleaner can be conductive so you don't want any lingering). Best way to dry it is in the airing cupboard overnight.

    Also have a look round all the connectors for dry joints. Some cars are prone to them due to the the vibrations inherent in cars.

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