Diagnostics Thermostat question...
 

Went in to the Diagnostics a little while ago, got down to 7 (temp & speed section) but 7.0 - which should give data on coolant/engine temp - was blank - and just showing _ _ _ _ _

The car hadn't been driven for 24 hours, but I thought the data was stored...

I'm doing this to potentially improve mpg, and wondered if the lack of data indicated a dodgy or kaput thermostat.

Advice anyone....

Did you start the car? I think I'm right in saying it has to be running for this test.

Yes you got to the correct item. Start up, then temp shows.

That doesn't sound right to me. The diagnostic screen should show the current temperature with or without the engine running.

Did you read the latest revision? http://www.the75andztclub.co.uk/foru...ad.php?t=55585

Does your temperature gauge work normally?

TC

My understanding is the same as that of yours TC - namely that the data should show whether engine is running or not. As to your latest revision, I did read that after I did my test, and will try "your" way tomorrow. I did note that these two steps were reversed, in your version, in comparison with the previous guidance.
- Put key into ignition and turn it to position
- Press and hold the trip reset button.


I did not intend driving with diagnostic mode active, so I did not start the engine - but if I do need to start it, as Gerfix and DerekS suggest, do I leave it running until the temp gauge on the dash goes up as high as it can?

Thanks
Leander

hi all i done this test 2night sat in car engine key in first position no reading ----
started car went to 59 took it for 5 mile run in test mode my highest
reading was 88 hope this helps.





ref jules needs to be in second position thanks jules

Yes, that does help! Thanks cafeteria:D
- I'll do that at my first opportunity.

The ignition has to be on
ie in Second position, but the engine doesn't have to be running

Thanks Jules:} - yet another refinement to my knowledge!
I presume you leave it running till the thermostat reading stops rising...

So your thermostat is working by the sound of it then!;)

Second position in ignition makes sense right enough. I only ever tried with P1 and engine running.