Does anybody have an experience if it is OK to have no voltage on pre lambda in MES? What I have catched from two guys having TA on MES they have the same results. Car just goes fine without any issues, fuel consuption is in normal.

maximvibe said:

Does anybody have an experience if it is OK to have no voltage on pre lambda in MES? What I have catched from two guys having TA on MES they have the same results. Car just goes fine without any issues, fuel consuption is in normal.

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I'm guessing a bug in mes not reading the correct information string from the ECU

It could be worth asking the same question on the MES forum.

Already asked on MES forum with no answer

Can any twinair engine owner with MES try if it is normal to have no value for Precat voltage or should be visible?

Thanks

maximvibe said:

Already asked on MES forum with no answer

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I've no specific knowledge on this one, but if the car is running normally and other folks are finding the same result, I'd say it's most likely just something which hasn't been implemented fully in MES yet.

Personally, I wouldn't get stressed about it.

Hey,
I know its 4 years old, but I have the same issue on my car. I can definitely say it's not a bug in MES, i had the car in a workshop that uses Bosch testing equipment and the issue is confirmed by other software. My car runs fine but has starting issues.

If there was a problem, then surely it would trigger the EML

No,
Didn't trigger EML. Car starts fine but stalls after 10 -20 seconds. I have to do a lot of cranking with throttle full open to start her up again. From time to time i collect mistakes like misfiring during the restart. But NO EML. To add a little craziness, when temperatures beyond 0C, car starts and doesn't stall at all.

Little update. Have fitted a new lambda sensor. Reading still is no Volts. Next step will be examining the ECU, as it refuses reset procedures by MES.

z rider said:

Little update. Have fitted a new lambda sensor. Reading still is no Volts. Next step will be examining the ECU, as it refuses reset procedures by MES.

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Have checked/ cleaned the second oil filter that is in the hydraulic block?

z rider said:

No,
Didn't trigger EML. Car starts fine but stalls after 10 -20 seconds. I have to do a lot of cranking with throttle full open to start her up again. From time to time i collect mistakes like misfiring during the restart. But NO EML. To add a little craziness, when temperatures beyond 0C, car starts and doesn't stall at all.

Click to expand...

Hi

I have 2 x Twinair parked outside..

Air temps here are -2 /+13'c


One car is perfect.. good history.. no problems


Other runs ok : But misfires and brings on MIL after 1 hour on light load ( turn on -off clears misfire ) Does not happen in a UK winter.. just the 9 mild months
Has a Historic poor running condition at @20'c engine temperature

I will try and get figures tomorrow via MES

Please ask for more info



So are you saying COLD is good ..or Bad..??

@maximvibe any updates?

I will get my readings later today

Punto 2012 85bhp Euro 5


Panda 2013 85bhp Euro6

If the precat 02 sensor is wideband sensor then the output voltage wouldn't be helpful unlike the voltage from a narrowband sensor.

Has the op checked his secondary oil filter in the hydraulic block/uniair module ???
The twin air can be a fussy beast regarding oil types , oil cleanliness, and the oil filterS
Which can cause all sorts of misfire and running problems due to the engine valves not opening correctly.

Interested to see that the punto is showing 50% of the Pandas voltage

Same MES 4.9 via ELM327 on the cars @5 minutes apart

PUNTO runs very strongly...so would trust its figures

Panda has covered 20k miles over 4 years with us... Reliable.. but could be better

Panda Dash and Temps.

I am 95% confident if I start the motor now it would run poorly for @1 minute

(That '1 block' of temperature on the gauge means it cannot run cleanly)


Been like this for 4 years... but still gives high 50's MPG... so obviously not 'broken'

The workshop that helps me got advice by a specialist for Fiat cars. Following this I ran the engine with oil flush. After that I changed engine oil and refilled with with selenia digitek pure energy 0W -30. I used the original Fiat filter (I think its produced by Mahle, as it had a Mahle code on it combined with Fiat Mopar branding). I renewed the little twinair filter. After that we tried to reset the multiair parameters but the Bosch diagnostics failed. I tried my MES but all attempts to reset parameters failed. I simply could not reset oil change and multiair calibration didn't work, but ended with unknown error message.
Today the workshop did a multiair calibration via internet with before mentioned specialist. It runs smoother now, but when I collected my car it again stalled after 20 seconds, so issue isn't solved yet.
The fact that MES didn't work lets me think that ECU may be faulty or the software has blanks in its mapping.
For the no volt reading, it may be caused by wideband lambda sensor, but in this case this should be a common reading.

@varesecrazy temperatures below 0C are good as the car doesn't stall. With higher temperatures the car stalls. When I got her running in the morning she runs fine for the rest of the day.