RAPID944

Hallo. I have a problem. It (928GT '90) runs only ~10sec. then something happens and it feels like running on half cylinders looks like temperature sensor (92860615502). But how can I diagnose which sensor is bad. I think there are 2 of them on each side?

Thanks.
Alfreds

John Speake

Look at the "igntion protection relay" which has a clear case. It is mounted on the same plate as the LH and EZK ECUs. Start the engine, wait for it to revert to 4 cyl mode and you will see a red or green LED light up, visible through the clear case.

Green LED means cyl 3 is running cool
Red LED means cyl 7 is running cool

RAPID944

Thanks John. But are there two or four sensors, I mean one sensor on each side cyl 7 and one sensor on each side cyl 3?
Thanks.

RAPID944

Ok got it, there are only one 3rd cyl and one 7cyl.
Alfreds

John Speake

Yes, correct. Earlier cars had the sensors on 4 and 8. The later cars like your has them on 3 and 7.

You can bypass the relay to assist fault finding. Link relay pins A1 and A2 to 87 (do not mistake A1 for AL)

RAPID944

Thanks!
Alfreds

John Veninger

This may help.

http://www.nichols.nu/tip633.htm

RAPID944

Thanks! Very good description.
Alfreds