Trust plus light coming on, loss of power - any ideas?

[stotham]

Hi - Help needed please on a 2001 598cc Pulse ForTwo

Whether stationary or moving, at just over 2,500 constant rpm's, the trust plus light comes on and you lose power. A quick flick of the ignition key reset it till the next time.

Took it to SMART dealer in Edinburgh, £200 later told no fault codes stored and should change the rear drive shafts for £450.

Changed the rear reluctor rings for £35, cleaned and tested the ABS sensors, disconnected the battery for 20 seconds several times, all to no avail.

As I can replicate the Trust+ light coming on and loss of power whole stationary, ruled out the yaw sensor. Had a plug fitted anyway, which I've tested with it in and out of the fuse socket.

Searched through similar past posts, but none concluded what the fix was.

Has anyone got any idea what I can try next? The car, which I look after for a charity, has had this fault now for 10 months, and pulling my hair out with it. Runs perfectly normally between incidents, however the volunteers rightly have no confidence in using it.

Appreciate any thoughts. Thanks

[Sam]

Re: Trust plus light coming on, loss of power - any ideas?

did they say the exact fault on the machine ? as they car wont cut out and not give an error if it does its very rare

[stotham]

Re: Trust plus light coming on, loss of power - any ideas?

did they say the exact fault on the machine ? as they car wont cut out and not give an error if it does its very rare

They couldn't replicate the fault when I took it, and said they was nothing stored in the fault history. Since then, I am able to replicate the fault on demand, but after the £200 bill the last time and their attitude, I am reluctant to take it back.

My local mechanic has plugged in his computer, but it is not picking up the code when it happens. Could be that his system is not interfacing correctly (Snap-on ethos).

I see that you are not that far away, do you have a computer that reads the SMART?

Cheers

[Sam]

Re: Trust plus light coming on, loss of power - any ideas?

hmm without advertising as i dont want to annoy anyone, i can tell you all i do is work on smarts :-)

[Thrumbleux]

Re: Trust plus light coming on, loss of power - any ideas?

I see that you are not that far away, do you have a computer that reads the SMART?

Cheers

Sam's your man.

[problemchild1976]

Re: Trust plus light coming on, loss of power - any ideas?

If i am understanding your symptoms correctly, i would say that surely it must be the reluctor rings....

have you done the front ones too!!

but then again, if it is happening when stationary, not sure!!

JJ

[10:45PM]

Re: Trust plus light coming on, loss of power - any ideas?

Whether stationary or moving, at just over 2,500 constant rpm's, the trust plus light comes on and you lose power. A quick flick of the ignition key reset it till the next time.

...A couple of questions:

#How do you mean 'you lose power' when stationary?
Do you mean the revs drop?

#Why would you have the revs at 2500 when the car is stationary ?

@ problem child, the fronts aren't usually a/the problem

[stotham]

Re: Trust plus light coming on, loss of power - any ideas?

Thanks for the quick responses and questions.

#How do you mean 'you lose power' when stationary?
Do you mean the revs drop?

Happens when driving or stationary, Trust Plus light comes on and engine revs drops to idle, pressing the accelerator does nothing. Only way to gain control is switch off and switch on the ignition key, and if you flick it quickly you can carry on your journey without the car coming to halt.

#Why would you have the revs at 2500 when the car is stationary ?

You wouldn't normally, however after months of the fault happening and thinking it was related to the car being cold and or going down an incline, I noticed it always seemed to happen just over the 2,500 rpm mark when you held the revs constant for 5 or 6 seconds then slowly reduced the revs. Light comes on straight away and loss of revs. Thought I would try it while stopped, as this would help significantly with the fault finding if I could 'replicate' on request. Happens every time even when the car is still, revs just above 2,500 rpm hold for 5 or 6 seconds, then slowly reduce, bang, light on loss of revs.

@ problem child, the fronts aren't usually a/the problem

Thanks for the suggestion, but fronts are surprisingly good.

Has anyone seen similar before? Car runs perfectly well between incidents. Cheers

[10:45PM]

Re: Trust plus light coming on, loss of power - any ideas?

Might sound a silly question but stranger things have happened before now.........

the trust plus light

you sure its the trust light ?

Changed the rear reluctor rings for £35,

what, you did ? or someone's just said they've changed them?

and that was each ? (rings are £25 a pop usually just for the parts)

As I can replicate the Trust+ light coming on and loss of power whole stationary, ruled out the yaw sensor.

don't discount the yaw sensor unless you've actually swapped it out - stationary or not

Has anyone seen similar before?

no, which is why I'm asking these odd questions

PS have you changed the brake pedal switch yet?
and do all the rear lights work as intended?

[stotham]

Re: Trust plus light coming on, loss of power - any ideas?

Might sound a silly question but stranger things have happened before now.........
you sure its the trust light ?

I was calling it the engine management light for months, until I dug out the manual and found out is was something called the 'Trust plus' light. Had never heard of it till then. Yellow light on the LH side of the instrument cluster on the inner semi circle of dash lights.

what, you did ? or someone's just said they've changed them?

and that was each ? (rings are £25 a pop usually just for the parts)

I had them changed by the mechanic that looks after the car, and was the price he said they cost from an importer that only deals in the rings. I saw the new ones when they arrived and I also saw the rusty, split rings that came off, so it was done. He doesn't charge his labour as the car belongs to a worthwhile charity, which real helps and very generous of him.

don't discount the yaw sensor unless you've actually swapped it out - stationary or not

Ok, would disconnecting it or twisting it 90 degrees be sufficient? Don't want to waste any more money on parts unless absolutely necessary.

PS have you changed the brake pedal switch yet?
and do all the rear lights work as intended?

Never had an issue with the brake pedal or rear lights. Will check today - is there a known problem?

I read in an earlier post someone suggesting disconnecting the MAP sensor. Will give that a try also but not clear on the link.

:thanx: 11:45PM

[problemchild1976]

Re: Trust plus light coming on, loss of power - any ideas?

So the rings that were removed were definitely cracked??

Maybe the new rings are **** too or the sensor is damaged??

JJ

[problemchild1976]

Re: Trust plus light coming on, loss of power - any ideas?

Stupid iPhone double posting

JJ

[angieickle1]

Re: Trust plus light coming on, loss of power - any ideas?

Hello

This seems to be an old post but the exact same thing is happening with my car and need help.
I only got my car a week ago. Twice the Trust plus light has come on. Both times when pretty much stopped, only crawling along a tiny bit like at a junction waiting. When the light is on the car does nothing. Turn it off and back on it's fine.
I'm really scared as just got the car and really can't afford an expensive repair.

Any help for a newbie is much appreciated.

[oldgit]

Re: Trust plus light coming on, loss of power - any ideas?

are you talking about the light in the speedo on the lefthand side
that is a triangle shape , with a question mark in middle .

i had that coming on , losing throttle power / revs

my smart mechanic found it was the relay box under passenger
seat of my 2002 fortwo. [ can get damp / wet ]

tony [ oldgit ]

[lil.smartie]

Re: Trust plus light coming on, loss of power - any ideas?

Go & see Sam @ McSmarts he'll sort it for you.

Kate