|
Post by robvr6 on Oct 2, 2023 14:11:44 GMT
Hi, had my gen1 dongle for a good while now and always worked great but suddenly stopped working on my 95 vr6 as I was driving. Now it can't read the engine module but if I plug it into my a6 it reads everything fine.
Ive had all the wiring out and even spliced into the wires at the ecu it's self, no joy.... Checked the continuity of all the wires, everything checked out fine. I got to the point of there's nothing left to check on the car..
Finally checked the continuity of the 2 pins on the dongle for the L line and K line, I'm getting continuity thru these pins when the dongle is in my hand not plugged in.
With all that said does anyone know if I should be getting that continuity reading or is something up with my dongle.
Thanks for any kind of help.
Rob
|
|
|
Post by dv52 (Australia) on Oct 2, 2023 20:42:29 GMT
robvr6 :Hi. I intend no offense, but before we discuss your MY95 VR6 (I'm not really familiar with this car) - let's establish the basics to ensure that we are BOTH talking about the same thing. This is the standard wiring on an OBD port (I thieved the diagram from a local Aussie site):
This is a view of the female plug that sits on the car (of course, the OBD11 dongle has the mating male plug).
So, to be clear - I assume that you are referring to the 2 x ISO9141 protocol pins being: pin#7 = K-line and pin#15 = L-line.
I own a few "white" OBD11 dongles (which I never use these days) and when I apply my digital multi-meter to check continuity between pin#7 and pin#15 - I get open-circuit, meaning infinite resistance.
I have no knowledge of how the internal circuits inside the OBD11 dongle are wired and I'm not really experienced with these older OBD protocols - but the open-circuit reading that I measured is to be expected (I think) because these are totally separate diagnostic lines.
Again with no offense intended, I'm also not sure about how you are measuring stuff (I've been doing electrical diagnostics for many years - so I'm always suspicious of readings on meters - yes, they sometimes tell porkies ). What type of meter are you using and are you absolutely sure about the measurement?
Don
|
|
|
Post by robvr6 on Oct 4, 2023 16:58:04 GMT
Hi, yes pin 7 and 15 are giving me a reading, well the audio beep of continiuty. I havent got the multimeter on me at the minute but it's only a cheap one.
I was getting live data on the obd11 app while I was driving, reading the o2 sensor levels as it was throwing a code for it. Then all of a sudden no live data and not able to read errors or connect to the ecu.
So, everything else checks out like it should bar this.
I think I will have to test on another older car. Still works fine on our newer cars.
Thanks for testing your dongle for and basically confirming what I was suspecting.
Thanks again
Rob
|
|