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    Re: M.G ZR 1.4 03 REG Archived Message

    Posted by Darren Bamford on December 29, 2007, 7:12 pm, in reply to "M.G ZR 1.4 03 REG"

    Hi Jamie

    as a general guide if you have a DTC codes that relates to a fuel trim error or fuel adaptation error, you really should reset fuel adaptation levels back to zero.

    The fuel adaptation and learned values, reside in either "none voltage volatile memory" or "voltage volatile memory".

    The difference between the two are if the ECU is disconnected from a power source all the adaptation values will be lost, e.g ford ECC IV or ECC V system.

    The ROVER MEMS 3 is none volatile type , i.e even with the ECU unplugged it will keep all its leanrt values and adaptations.

    When you clear the DTC code for fuel trim error you must go into the advanced menu option's and Reset Fueling Adaption.This causes the MEMS 3 ECU to reset the adaptive values for the fueling and relearn them. Reset fueling adaption to 100%.

    you then need to start the engine and observe the live data values for the following:

    Fueling Feedback Status: Shows if MEMS3 ECU is operating with OPEN LOOP or CLOSED LOOP fueling. If the ECU operates with OPEN LOOP fueling continuously or always switches to open loop after a few seconds and then stays OPEN LOOP, then a fueling fault is present.

    Fueling Feedback Switch: Shows whether the ECU is currently reading the presence of oxygen in the exhaust gases. When oxygen is present (as indicated by the oxygen sensor) the status will show FUEL LEAN otherwise it will show FUEL RICH. The display RICH/LEAN indicates whether the ECU is determining the presence of a rich or lean mixture. Caution is required in interpreting this result however, if an ignition misfire or air leak into the exhaust is present the ECU will only see the excess oxygen and may incorrectly display FUEL LEAN when in fact there is unburned fuel in the exhaust gas. In normal operation this display should continuously switch rapidly between FUEL LEAN and FUEL RICH.

    Upstream O2 Status: Shows whether the upstream (pre catalyst) oxygen sensor is warmed up and ready for use in fueling feedback. A fault may be present if the value shows the sensor is not ready for more than a few minutes.

    Upstream Duty Ratio %: Shows the current amount of heating being applied to the upstream (pre catalyst) oxygen sensor.

    Upstream O2 Heat (A): Shows the upstream oxygen sensor heater current. This value
    will initially be high when the oxygen sensors are cold but should rapidly reduce to a low
    value.

    Oxygen Heater Drive: Shows the upstream oxygen sensor heater current.

    The most important PID in the live data that will indicate how the car his fueling is:

    Fuel Correction % Shows the current fueling correction applied to the amount of fuel
    injected. The correction is calculated using information derived from the oxygen sensors.
    No correction being applied is represented by a reading of 100%. A high reading indicates
    that the fuel is being corrected for a mixture which was too lean, a low reading for a mixture that was too rich.

    Also a lot of 1.4 and 1.6 engines around 2002 and 2003 had the incorrect tune and market configurations load on to the ECU and it may need the ECU updating with improved software.
    Only the MGR T4 tool will do this......


    what scan tool are you using

    HTH

    Darren..........

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