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Corsa C Fault Codes - Help?

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  • [Corsa C 2000-2006] Corsa C Fault Codes - Help?

    Hello, I hope this is in the right section as I don't use this website that much to post but I am really stuck!
    I have a 2002 Corsa C SXI 16v, it is running absolutely perfect, been serviced, spark plugs changed, oil, air and cabin filter have been changed. However, the other day my Emissions light came on so I did the pedal test and I got these codes..

    P0170 - Rich or Lean Exhaust


    I know these are all injector related but don't know where to start!

    Have had a look around on the internet but I can't find much that relates to me because as I say my car is actually running perfectly its just weird that I have the light on my dash and I would like to get it sorted so it doesn't turn into something worse and I have a car that I can't drive!

    Any help would be much appreciated, thanks.

  • #2

    P0201,2,3,4 means that the PCM detected a fault in the injector or the wiring to the injector. It monitors the injector and when the injector is activated, the PCM expects to see the voltage pulled "low" or close to zero. When the injector is switched off, the PCM expects to see a voltage that is close to battery voltage or "high". If it doesn't see the expected voltage the PCM will set this code. The PCM also monitors resitance in the circuit. If the resistance is excessively low or high it will set this code.

    Potential SymptomsThe symptoms for this code will likely be a misfire and a rough running engine. Poor acceleration. The MIL will also be illuminated.

    CausesThe causes could be any of the following:

    Bad injector. This is usually the cause of this code but doesn't rule out the possibility of one of the other causes
    Open in the wiring to the injector
    Short in the wiring to the injector
    Bad PCM

    Possible SolutionsFirst, using a DVOM check the resistance of the injector. If it isn't within specs, then replace the injector.

    Check for voltage at the fuel injector connector. It should have 10 volts or more.
    Visually check the connector for damage or broken wires.
    Visually check the injector for damage.

    If you have access to an injector tester, activate the injector and see if it operates. If the injector operates, then you likely have either an open in the wiring, or a blocked injector.
    If you do not have access to a tester, swap the injector with another one and see if the code changes. If the code changes, then change the injector.

    At the PCM, remove the driver wire from the PCM connector and Ground the wire. (Make sure you have the correct wire. If you're not sure, do not attempt) The injector should activate
    Replace the injector


    • #3
      Unusual for all 4 to fail simultaneously. You say it's been serviced - did this happen soon after the service? If so I'd check for something that's been knocked and may be making a bad connection. (The recent bad weather will make any poor connection more significant - I had a Toyota pack in this week with precisely this issue.) Don't forget to check the ECU connections, including the earth.

      The other possibility is a failing injector relay - that would nobble the feed to all four at the same time. Purple jobbie (if it's still the original one) - there are two of them in the fuse box, one is the fuel pump the other is the injector relay. They are generic so you can get spares more or less anywhere.
      1972 Viva restoration thread -