![]() ![]() ![]() In early cars the T10a plug is located in the plastic loom channel on the passenger side chassis leg. You could just splice the T10/14a wires direct to your engine loom if you prefer From now on I shall refer to this plug as T10a or T14a as this is how it is labelled in the VW wiring diagrams. They carry the same signals however the pinout is slightly different but I will cover this later. Early MK4 looms use a 10 pin plug, later looms use a 14 pin. All you really need from the donor MK4 are both halves of the ECU loom, then to make the loom my way you will also need a 10 or 14 pin plug cut out of a donor MK4 so the 2nd half of the ECU loom can simply plug in. The early looms have a couple wires switched over but apart from that they are the same as the later type, they have a green plug rather than white so easy to identify. The DBW pedal makes no real difference on its own as that is wired straight to the ECU anyway, so requires no thought apart from how to fit it to the car.Īlso for the section with the coloured plugs you have early and late type, though the early ones were only made for a year or so. You have 2 main types of loom in a MK4, DBW and non DBW or I suppose you could break it down to those with an ECU relay and those without really. The process for all the MK4 looms I have seen so far is basically the same, just a few tweaks required depending on the age and type. My aim with this thread is to cover as many MK4 conversions as possible rather than AUM/AUQ specifically, and also cover the splicing of them into both CE1 and CE2 fuseboxes. If in doubt check the various wiring diagrams in the link in my signature Also if you have a diesel engine make sure you read all the diesel notes carefully as there are a few pins which differ vs the petrol looms. The colours in this guide are based on an AUM/AUQ loom, AGU for example can differ here and there. Not all MK4/SEAT/Audi looms use the same wire colours but 99% of the time the pin locations are the same. Just an important note to start with don't go by wire colours in this guide, rather check the pin locations. Liability, Limited Warranty, and Returns Policy.How do all! Finally decided to write a new OEM guide containing everything I have learnt over the last couple of years making looms and trawling diagrams! Many thanks to 20v_Jimmy who created the original 20v OEM guide thread here: When purchasing this item please make sure to write the year and model of your engine and model of car in the PayPal check out. NOTE: You still need the two wiring harness's that plug into the mk4 ecu, Mk4 ECU with Immobilizer disabled and electric gas pedal.įor all those that will use the Mk2/early Corrado instrument cluster, you will need a digital-to-analog converter for the RPM to work.Īll VR6 swaps will need a "swap file" ECU reflash to prevent early rev limiter. With over 10 years and 100,000 km of testing, our adapter harnesses can make your swap run like OEM. Our harness plugs in between your Mk4 harness and a Mk2-Mk3 (ce2) chassis. If you're swapping a 99.5-05 VW mk4 2.0, 1.8t, 12v VR6, 24v VR6, Mk4 R32, VR5, TT180, TT225, Mk1 TT3.2 or 01+ 1.9 ALH into a older chassis, this adapter harness is for you! Simplify your swap with our plug-and-play harnesses.
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