Auto Code Services

FAQs on ECUs and Vehicle Dignostic Faults

  • Can the car be put back to standard?

    Putting your vehicle back to standard after a performance tune is not an issue

    Auto Code offer this service free of charge. But we'll be very surprised if that's what you want after trying out your new tune. Should you lose your tune due to dealer actions or parts failure Auto Code will re-install the map into your car free of charge for as long as you own the vehicle.

  • What is ECU Re-mapping or Chip Tuning ?

    Chip tuning or ECU Remapping whats the difference

    Enhancing the performance of a vehicle was coined with the the term "Chip Tuning". It was done in the 80's and 90's and involved reading modifying and programming a chip inside the engines ECU (Electronic control unit) called an Eprom (erasable programmable read-only memory). The Eprom was removed from the ECU. The eprom code was read, modified and then programmed into a new Eprom. You replaced the Eprom in the ECU and the cars performance was enhanced.

    Manufacturers of add-on boxes and diesel performance boxes still use the phrase "Chip Tuning" but more about this later - A Remap is not to be confused with this inferior way of adding power to an engine.

    At the time, engine control units and the procedure of chip tuning was state of the art cutting edge technology.

    It is now old and the technology is prehistoric. Engine technology and it's electronic control has jumped light years ahead.

    The ECU now contains software that can be read or downloaded onto a computer. The information can be changed in the form of service updates or modified tunes. The information is uploaded or programmed back into the ECU and no parts are changed.

    When a vehicle manufacturer programs the engine control unit, very wide tolerances are often used. It uses a kind of one does all program. The dealer has to do this to be very tolerant of those who don't service their car or maintain it. It is also tolerant of many different countries climates, humidities and altitudes. Fuel grades are also another important consideration.

    With all those limitations factored into the cars ECU it is actually compromising the vehicles performance.

    A remap from Auto Code still takes many of these factors into consideration and enhances them. Polishing the tune if you like and achieving better results.

    A knock on effect you can enjoy from an efficient running engine is improved fuel economy and improved derivability in the form of smoother gear changes and a much more crisp pedal response and acceleration.

    Customers who have had their vehicles re-mapped often ask "Why wasn't this done at the dealer ?"


  • Why have a Remap when I can fit a Chip box or Diesel peformance box ?

    There is a difference between a Performance Chip and a Diesel Performance box

    Performance chip boxes or Diesel performance boxes work in a very different way to a remap. They do give an increase in performance but they work on the principal of more fuel = more power. They connect between the fuel rail pressure sensor and the manifold pressure sensor and trick the ecu into seing different values than what is actually happening. The ecu then increases the fuel rail pressure which injects more fuel. it stresses the fuel system and offers quite a harsh or on/off style performance. you can often tell when you are behind this type of modified vehicle by the black smoke it belches out when it accelerates. They offer no fuel economy and the engine control unit has no redundancy or fault tolerance as it never knows the real values of the fuel system. It can not adapt to different operating conditions and is by no means comparable to a custom remap.

  • Will my fuel consumption go up after an upgrade ?

    What happens to my fuel consumption after an upgrade

    No, in fact its the opposite. Even on a performance tune, If you drive the new tune hard then your fuel consumption will increase. If you continue to drive the car in the same way as you did before the upgrade, your fuel consumption will improve.

  • Will re-mapping invalidate my car's warranty ?

    Re-mapping invalidating your vehicles warranty ?

    It is highly unlikely that a remap will invalidate your warranty. The remap is invisible to diagnostic equipment. All functions of the ecu remain exactly the same and all tuning files are tested over and over again for optimum performance and reliability. Auto Code tuning work is also fully insured and guaranteed for your piece of mind.

  • Will the tune effect my engine?

    How will the tune effect my vehicles engine

    Your engine will not be over tuned which prevents stressing the engine, transmission, cooling system, ect and so it does not reduce the life span and reliability of the car. This is why it's so important to choose the best.

    Great care is taken to ensure that all of our modifications have no detrimental effect on your car. In a lot of cases the tune actually helps to extend the life of components such as the clutch and gearbox by making the delivery of the power far less aggressive and smoothing the overall drive of the vehicle.