Citroen SM injector points

Hi, Rhys
one more idea from me:
Did you do the measurements directly at the plug towards the ECU?
Reading out the sensors directly will not detect all possible problems...
Maybe you have a connector- or wiring-harness-problem. Missing electrical connection from the temp-sensors towards the ECU means fully enriched mixture.

Regards
Norbert

Moin,

hab die Anfrage mal ins SM-Forum verlinkt:
citroen-sm-club.de/club/index.php/de/for...-036-leihweise#79887

Mit sonnigen Grüßen
Hans

citroen-sm-club.de/club/index.php/de/for...-036-leihweise#79888
Erste Reaktion ist schon da, vielleicht sollten wir den Workshop in der CH machen?

Hallo Hans,

vielen Dank für Deine Hilfe. Jetzt schauen wir erst mal, wie das Interesse am Workshop in Deutschland 2016 ist. Danach können wir auch über die Schweiz nachdenken. Ich frage mich nur gerade, woher ich den Chris kenne. Gerade habe ich nachgesehen, denn sein goldener SM kam mir bekannt vor. Er ist ja hier registriert und hatte sich auch vorgestellt.

Howdy all,

I got the chance to spend some time with the car today. Prior to assessing the exhaust with a gas analyser I connected a Bosch EFAW228 diagnostic unit to the ECU loom.

Unfortunately the results were all low - and it seems the unit is inaccurate. Something to fix.....before fixing the SM.

I could see that (via a multimeter) I am getting 11.9V power at pins 24 & 16 with 11. Also getting 1.8 K resistance for TII at pin 23 with 11.

I'll have another crack with the repaired Bosch tester.

cheers,
Rhys

Hi Rhys,
you can do all the readings without the EFAW228.
You would need some additional equipment like some resistors only for active tesing the injectors -but this will be not the problem of your car...

Download the measuring-plan here: jetronic.org/de/forum2/jetronic/19-messp...nts-by-car-model#170

Please post questions or annotations...

Wish you much of success

Norbert

Volker wrote: Howdy Rhys,

no the trigger contacts only supply a falling edge to the ECU and it triggers on that. It does not matter how long T.C. will close or open. So it cannot influence mixture,

Hi Volker,
What you and Norbert say about initiation of pulse and falling edge is no doubt correct when everything is new.

However, on my own car (4.5L 107), when I had very smoky exhaust and sooty wet plugs, it finally turned out to be due to worn out trigger points. Others with Djets have seen same thing. It seems that the angle that the point contacts stay closed for does affect engine operation. I seem to recall something from Bosch suggesting measuring that angle electronically (like Dwell). We found problems when that angle got to be high - say above 150deg. Now with Norbert's tool, we can adjust that!

Those Citroen trigger points are interesting! Even have adjustment!