hi all,
new to site so hope i get this right,

Car has no throttle response garage plugged it in a came up with a number of faults
608H/1544 Undocumented / code anyone know what this one means??
P0120 Pedal possession sensor circuit 1
P0101 Air mass sensor circuit
And on to do with the air con but would think that’s irrelevant

I have changed the pedal sensor (accelerator pedal) hope that was the right one,
But still have no accelerator or revs.

Anyone experienced the same or got any ideas on the undocumented code??
cheers Adam

You could try un-plugging the connector to Air Mass Sensor and see if anything is different , will still get fault code still but doing this is known procedure to eliminate or know if Air Mass Sensor is a faulty item..nothing to loose and worth a try located beneath battery attached to airbox and the electrical connector is on top just remove the connector and see if makes difference

hi,
tried this no change

608H and 1544 are unrecognised codes. Could mean your garage is using diagnostic equipment that is unable to read Fiat manufacture specific fault codes.

Both throttle pedal sensors are mounted in the pedal. If you have changed the pedal for a known good one, you shouldn't get that code.

Would be best to get the codes read with the correct equipment before proceding further. Diagnostics by substitution will be expensive.

so i am learning purchased new pedel sensor,
cant get car to fiat very easily without further expense, was hopeing somone might have experianced similar and had successful outcome

i havent had this issue on my Fiat, but i have had it on my 4x4. In the end, I changed my pedal. The issue was that the ecu didnt know when the Accelerator Position Sensor was switch or not, so it didnt allow throttle. This was simply a small micro switch on the pedal, a basic on/off signal. If everything is built into the pedal, then i would trace the wires from the connector TO the pedal, back to the fuse box AND EARTH, as I am fairly sure the pedal will be earthed (mine on the 4x4 is at two points on the engine block-cleaning this also made a difference but didnt cure). so, in your codes its the P0120 code, it doesnt know the position of the pedal, on/off or how much its depressed.

So, check for bad earth points, check the plugs to the pedal and trace back. Also, try resetting the ecu, i think the procedure on the stilo is to unplug the battery and leave for at least 30 mins, but you need to check that. Then, get some proper diagnostic equipment and clear the codes.

best of luck chap, hope it gets sorted.

Mate I had the same problem last week. Would start fine, but pressed the accelerator and nothing. It went to a garage for a week and they couldn't fix it. Recommended that I take it to fiat. Well in the end I cleaned out the EGR valve. Took me about an hour and a bit - then she started and is running better than ever. It was jammed. All fixed apart from the faulty dashboard. That's another story. There is a guide on this forum of how to do it. It's simple.

Try that as its a cheap way to illiminate things.

thanks for that i will give that a try and keep me fingers crossed

thanks for your response, i have changed the pedal sensor, no change. will try all your other suggestions. many thanks

I had this on mine, unfortunately it meant a new ECU! Well, it had to be remanufactured. Cost about £200.

hi all,
tried all of the above cleaned egr, new pedal sensor disconected air flow snsor.
still the same.
going to check wiring and volts on pedal sensor tomorrow. have been advised most likly not ecu by ecu repaire firm.
any other ideas or imput would be graetfully received

help!! no power to throttle sensor

hi all
I have no power getting to the throttle pedal sensor on 1.9jtd. I know I am supposed have 5 volt feed form the ECU. I am lead to believe that the feed from the ECU goes through other sensors and of which if faulty could result in loss of volts.

Anyone have a wiring diagram or know which sensors are linked to throttle power feed, or fixing suggestions.

help on the above problem would be much appreciated

Re: help!! no power to throttle sensor

i cant personally suggest anything in terms of the wiring, but, have you checked the earth from the pedal back? It could just be one or both sensors dead?

Re: help!! no power to throttle sensor

furn4adam said:

hi all
I have no power getting to the throttle pedal sensor on 1.9jtd. I know I am supposed have 5 volt feed form the ECU. I am lead to believe that the feed from the ECU goes through other sensors and of which if faulty could result in loss of volts.

Anyone have a wiring diagram or know which sensors are linked to throttle power feed, or fixing suggestions.

help on the above problem would be much appreciated

Click to expand...

I read that in another thread on here as well a while ago but can't remember what the thread was called so will struggle to find it. I think it was Davren who had posted what shares the 5v feed, but not sure. If you have no power to it whatsoever and everything else seems to be working then best thing to do it trace the wires from the throttle body and see where they go, check the condition of the wires and any breakages etc, most likely a grounding issue, but have you checked the connection's not come loose at the throttle pedal?

Re: help!! no power to throttle sensor

furn4adam said:

hi all
I have no power getting to the throttle pedal sensor on 1.9jtd. I know I am supposed have 5 volt feed form the ECU. I am lead to believe that the feed from the ECU goes through other sensors and of which if faulty could result in loss of volts.

Anyone have a wiring diagram or know which sensors are linked to throttle power feed, or fixing suggestions.

help on the above problem would be much appreciated

Click to expand...

The Throttle Pedal Sensors (K55) get their power and earth supplies from the engine management ECU (M10) via the D4 connector underneath the engine fuse box. Sensor 1 gets power from pin 78 and earth from pin 76 of the ECU. Sensor 2 gets power from pin 81 and earth from pin 79 of the ECU.

As all of the TPS wires go through the D4 connector, it would be a good idea to clean it with electrical contact cleaner if you haven't do so already. There's a guide to locating and cleaning it here: https://www.fiatforum.com/stilo-guides/99828-d4-connector.html
.

Re: help!! no power to throttle sensor

cheer for all the imformation,
tried D4 connector, no luck. i have auto ecectrician coming to have a look, fingers crossed he will be able to diagnos the problem and might find this info handy.

Let us know how u get on.

How did you fix the issue?