Can anyone with a M44 and a multimeter do me a favour?

[john318is]

Dme connected. Correct

Thank you!

[pauliescff]

[QUOTE=john318is;29718543]Thank you![/QUOTE

No problem. Let me know the outcome

[john318is]

I've posted back in my other question thread as I don't really know what to do next.

[john318is]

Pauliscff, any chance of another check?

* this time DME disconnected
* this time check on the socket on the DME itself
* check resistance/ohms between pin 30 and ground (for ground can use the DME casing or pin 55).

Thank you.

[samy01]

Pauliscff, any chance of another check?

* this time DME disconnected
* this time check on the socket on the DME itself
* check resistance/ohms between pin 30 and ground (for ground can use the DME casing or pin 55).

Thank you.

i can't quite follow what you guys are doing but i hope that you are aware that you always have to disconnect the computer (DME) before measuring resistance. otherwise you could kill it by measuring resistance.

[john318is]

i hope that you are aware that you always have to disconnect the computer (DME) before measuring resistance. otherwise you could kill it by measuring resistance.

No, I don't believe that is true.

Measuring resistance on a device that has power might result in an incorrect reading, but not damage.

[samy01]

umm okay have fun breaking things then

it will also kill your measuring device when measuring resistance on a wire that has power

[john318is]

Not meaning to start an argument but just to ensure that correct information is out there...

umm okay have fun breaking things then

What makes you think that a multimeter can cause damage? Do you have any sources to confirm this? Although I worked in electronics for more than 10 years I've just Googled this and can't find anything to suggest I am mistaken.

it will also kill your measuring device when measuring resistance on a wire that has power

This would only be the case with very high voltages. 12V in a car is not going to be an issue.

[samy01]

it won't kill your dme if you do it once, but if you do it 100 times then the chances are that the electricity which the resistance measuring device sends out can damage the ecu. it's theory, real life is another story of course. i've seen people breaking their dme or ecu like that, and i personally replaced them because of wrong diagnostic work. my brother once broke an ABS sensor that had an integrated ecu/computer which he should have checked with an oscilloscope or a volt meter and not by measuring resistance. why would you even ever measure with the dme connected. any measurement i can think of doesn't include the dme. i would only measure through the harness from the connection where the harness connects to the dme to the sensors connection or whatever you need.

i just wanted to say it. and if you have 10yrs experience in electronics i think you know what you're doing. let's not argue, i won't interrupt your thread anymore.