Hi guys, i've googled a lot and watched almost every thread in this forum.

The car runs perfectly and starts without problems. But I still get a solid cel and the fuel pump doesnt prime (makes no sense because the car starts??).
When I pull the fuse 24 and put it back many times the cel comes on for 2 seconds and goes away and the fuel pump primes like it should! But only for one time.
What I also figured out is when I unplug the Connector A on the ECU and plug it back in it also works but also only for one time, then I need to unplug and plug it in again.
I already changed the main relais with a good known one.

What could it be? A short in a wire? The ECU fried? Maybe only Capacitors or IC17?
The problem came from a day to another.

I hope u can help me!
Greetings from germany

 

Pop open your ECU and look inside. I suspect you may see some evidence inside.

 

I already did several times but found nothing.. i checked all capacitors but saw no leaks. Do you know how to check them or the IC17?

 

I don't understand your symptom. Are you suggesting that when you turn the key on, the CEL stays illuminated and the fuel pump DOES NOT prime, but you can start the car and it runs and drives fine anyway ?

 

yes. It sounds weird but it’s actually like this. I figured out that when I first put the key in and switch to on the cel is solid and the fuel pump doesn’t prime. But when I turn the key to the left and very very fast to ON again the car act like it should. The cel stays on for 2 seconds and the fuel pump primes. When I turn the key too slow to ON the cel stays solid (or sometimes goes away directly but without fuel pump priming) and the fuel pump doesn’t prime. I made a short video to show you because I found nothing similar like this anywhere: https://youtube.com/shorts/CZeUbeRZ7us?feature=share
If you hear closely you will notice that the main Relais doesn’t click like it should.

so what are the symptoms for this?? Can it be the ecu? The ignition switch? I already replaced the main Relais and checked all grounds.

 

You have caps/IC's in the ECU going bad. The sooner you get it repaired, as in YESTERDAY, the better chance you have of actually saving the ECU. Your "Key Dance" is merely coincidental... the delay times will simply get longer and longer until it just doesn't work any more. The ECU in my Del Sol started showing this symptom a month ago and now it takes over ten minutes to charge the main relay and prime the fuel system. I am replacing the ECU this week.

 

thank you very much. That’s the answer I needed! I just ordered a new ECU (sadly I got the P28 G03 with Immobilizier so i need to solder it out). I will solder new caps and IC17 in the ECU I got right now and will update the thread. I hope it works then! I need the car without CEL on Monday to register the car in Germany. You can’t register cars in Germany with CEL on because of safety

 

Good Luck.

 

thank you. Seems like it’s really the ECU. I just got the new ECU and the car act normal with the new ECU. Just need to exchange the Immobilizier Chip.
I also replaced all the transistors in the old ECU but that didn’t helped much. I think I also need to change the QM3 Chip and the ECU is good to go.

 

Did you end up fixing it?