Throttle Position Sensor Options

[isettaman]

Hi All
My 2002 2.4 petrol V70 has a faulty throttle position sensor. As I see it, my options are:-
1. New throttle body - aaargh - price - £600+
2. Have existing one repaired by specialist - £150ish - any recommended specialists?
3. Install replacement digital unit - £80ish
4. Install replacement manual unit - are they available anywhere?
What are your thoughts/suggestions?

My current unit is a Magneti Morelli as below.
Thanks
Dave

[stuart bowes]

Volvo diagnostics Tilbury told me when I asked, they don't do the repair any more because the sacer repair units were too hit and miss

in theory if you do repair yours with an ebay sourced replacement unit then you don't need it programmed which saves you a cost

that's the 'simplest' method in terms of logistics (no programming required) but you are relying on your own capability to replace the sensor, I managed it ok on my original TB but on refitting it, not working.. hmm. still not sure if I did something wrong, or the fault was not related to the sensor ..

replacement entire throttle bodies are usually easily available on ebay but the chances of it working without needing coding is near zero (or actually zero?) . later yellow labels are supposed to be more more reliable (? someone else confirm ?)

you can get them coded in, I did it that way in the end, and found a replacement which already had the upgraded sensor fitted, got that programmed on my driveway by the guy from Tilbury on his way home so I got lucky there

[stuart bowes]

the whole story is here https://www.volvoforums.org.uk/showthread.php?t=324842

with apologies for it waffling on a bit in places

[stuart bowes]

oh and yes sorry nearly forgot

before you do anything else just check the two red fuses in the top left of the engine bay fuse box, they're probably fine but if they do go you lose throttle body power and thus comms as well

bit of a shot in the dark but you never know (depending what fault codes you've actually got... ?)

[isettaman]

Originally Posted by stuart bowes

oh and yes sorry nearly forgot

before you do anything else just check the two red fuses in the top left of the engine bay fuse box, they're probably fine but if they do go you lose throttle body power and thus comms as well

bit of a shot in the dark but you never know (depending what fault codes you've actually got... ?)

Thanks Stuart for your input.
I will look at the fuses as a precaution.
Erratic running/idle etc is my problem, I sit in the car at idle and watch the throttle position going up and down on my scanner without me touching anything.
I'm leaning towards replacing the sensor at the moment.
Dave
PS Seen that video showing the replacement.

[isettaman]

A follow-up, just found instructions for disassembling and cleaning the original sensor, worth a punt?
Dave

[stuart bowes]

I guess so, if it's already knackered what's the worse that can happen (famous last words..)

depends what the actual fault is, I'm still of the impression mine was more an internal fault instead of the sensor itself but I can't totally rule it out

and if it's to do with bristles wearing down and not contacting correctly maybe cleaning won't do anything ? who knows

[Dippydog]

My V70 [a phase 1 2.4 petrol]TPS played up and at idle the revs would surge up and down and unless you could hit a "sweet spot" the car would jerk really badly when trying to drive it.Mine has a Magnetti Marelli TB with two TPS one which faces the radiator[as your picture seems to show] and the other opposite this between TB and engine.It's the "inner" one I had to change so the TB had to come off which meant moving the starter motor to get the wiring plug out.Having said that the whole process took less than an hour to remove TB fit Sacer and replace TB and all has been good since[about 6yrs].

[isettaman]

Originally Posted by Dippydog

My V70 [a phase 1 2.4 petrol]TPS played up and at idle the revs would surge up and down and unless you could hit a "sweet spot" the car would jerk really badly when trying to drive it.Mine has a Magnetti Marelli TB with two TPS one which faces the radiator[as your picture seems to show] and the other opposite this between TB and engine.It's the "inner" one I had to change so the TB had to come off which meant moving the starter motor to get the wiring plug out.Having said that the whole process took less than an hour to remove TB fit Sacer and replace TB and all has been good since[about 6yrs].

How did you discover which sensor was faulty? There's nothing showing on vida with mine.

[stuart bowes]

That's interesting as I was under the impression the original uses 2 pickups one each end, somehow comparing or averaging the 2 readings.

Whereas the new contactless sensor only needs one end the other is a blank cap (or did I just leave that old one in place) although you had to dig out the sealant and do something with the pins didn't you I can't remember now fully

The video told me which end to fit which bit, I think? But it's making me wonder why you would be concerned which end was faulty if you're replacing both effectively. (One with new, one with nothing) ?