OEM management wiring: 1.8T => Mk2 harness install FAQ

Do you have any idea how to wire the alternator ?

The small plug is plugged on the alt , the big wire goes from alt to starter and there is a big square plug left unplugged ( because I don't have all the wiring needed for the battery ). Since the alt has no permanent magnet , I must supply 12v and ground to the small plug but I don't have any clue which wire is which...

 

It is a mk1 with a 1.8t from a mk4 and I have neither of those wire. All I have is the original mk4 wire with 2 plugs , one for the alt and a big square plug that went to the battery ( which I don't have the harness to go to the batttery )

 

right so iv got my engine running now and it runs ok, has anyone got a pin out for leon cupra clocks, and what wires go were in relation to the engine looms, ie vss in and out, temp,oil press ,rpm etc, i have the closcks and plugs with 6" of wire coming out of them , i know the lives and earths and can get them to come on with ign, just cant get them to show any movement on the guages

 

thanks for that, that sort of helps except i dont have a mk2 fuse box to reference the u1-u2 numbers, all i have at the mo is the clocks with a length of loom and the amk engine loom, is there anywhere that shows where the pins from u1-u2 go to?

thanks

 

am i right in thinking the green/brown pin 11 from the clocks connects to pin 2 green red in the orange plug? as iv done that and still no rpm

 

i made a swap as in title on audi a4 1995. i simply used euro 4 harness ans sensors, also fitted camshaft adjuster behind cylindear head with electromagnetic actuator. car has a problem starting with Euro 4 cranshaft sensor(g28). it starts only with euro 2 g28. for euro 2 sensor i have to swapt 1 and 3 wires in plug to start with it. with euro 4 sensor ans normal fitted wires i dont see any RPM on start up. cars doenst start even when is pushed. I checked etka and ring for g28 is same for euro 2 and 4, so i dont need to open engine and fit euro 4 ring on crankshaft.
I checked wiring for g40 and g28 and are ok to ecu.
I also checked voltage on g40 and g28
g40 = 4.95v at ignition and cranking
g28 = 2.5v at ignition and cranking

g28 from euro 2 and from euro 4 have same lengt so they reach same dept in crankcase.

I wonder it there is a voltage problem in ecu pcb and g28 has poor voltage. i need a hint if someone can help me somehow.

 

Cars starts at 4th 5th cranking and has incorrelation between g40 and g28. Also in this case after 4000rpm variable adjustment of camshaft with electronic actuator is not possible!

 

With g28 from euro 2 i have rpm
With g28 from euro 4 i have 0 rpm
Sensor was exchanged few times even with new

 

Car has now conversion from euro 2 aeb to euro 4auq. I used entire engine harness for euro 4 and ecu for e4. So I also used euro 4 sensors. With euro 4 sensor on crankshaft it doesn't start once rpm is zero. With older euro 2 sensor it start very hard at 5th cranking but ecu needs to work with euro 4 sensor which values it doesn't actually see.....with euro 4 sensor on crankshaft i have 0rpm. I really don't understand once wiring is ok and stages ok for both sensors. Both sensors for camshaft and crankshaft were changed to eliminate them

 

Ssp document for me 7.5 injection specifies that it should start even when camshaft sensor is defective. But when i remove conector for camshaft sensor it wont start anymore even with euro 2 sensor on crankshaft. I need Some hint about voltage needed for crankshaft sensor since i olnly have 2.5v instead of 3.1....i dont understand why because camshaft sensor has 4.95v instead of 5.1v. so when you think about crankshaft sensor beside camshaft sensor wich are both supplied by ecu, is don't understand why there is so poor voltage on crankshaft sensor(0.6 less) when on camshaft sensor there is only 0.15v less