Ecu testing

Hi,

I have work alot with Bosch D-Jetronic to Volvo 164E.

And now I have try to build a teststand for ECU.

I have one problem betwin ca.1800-2200rpm and 2-25 InHg I get very high opentime on my injector ca. 500-600 ms opentime. But only in this rpm area. You know what can be wrong? You have referance value for a 0 280 001 009 ECU? I do this test with simulated 300ohm on coolingwater temperature sensor and 390ohm on air temprature sensor.

The Main reson that I do this test is I have very high fuel consumsion and have checked everything alse.

Mvh. Knut Åge

Hi Knut,

that sounds nearly impossible. At 2400 rpm on a 6-cyl engine you have an injection every 25 ms or every 50 ms on each cylinder. How on earth would a pulse last 500 ms?

Really high fuel consumption normally comes from

• Mal-functioning MAP sensor (leaking or detuned)
• Missing water temperature sensor
• wiring harness problems
• ECU only in very few cases

If you can see the movie I post link to YouTube, you can see the high reading on the opening time om injectors.
You think it is not reel value and it is something that disturbe the valuereadings in the instrument and make fake value reading? It is only betwin 1800-2200rpm.

Map is not leaking and inductanse value is ok betwin 0-25InHg.

Coolingwatertemprature sensor and air temprature sensor is okey and good contact betwin sensor/wireharness/ECU.

Fuel pressure 2,1bar and injectors are tester and find ok.

Mvh. Knut Åge

Hallo Knut Åge,

Deinem "Messinstrument" würde ich nicht wo wirklich trauen. 500 ms kann nicht so recht sein.

Hallo,

und dann solltest Du prüfen, dass Du die richtigen Komponenten hast. Du kannst Dich da an der Steuergeräte Liste entlang hangeln. Türkis blaue Einspritzventile sollte er auch haben und die passenden Druckfühler stehen auch dabei. Dicht sollte der natürlich sein.

What you use for messure injector opningtime? You have never see value like this before when you checking ecu?