2001 V70 T5 Throttle hesitation

spitv8 · Post by **spitv8** » 12 May 2010, 17:47

Hello

When I bought my V70 it was suffering from the idle surge familiar to so many. I removed the ETM and gave it a thorough clean, refitted and all was perfect for at least ooooh... a month. Then one day the AC pump siezed overnight and it would seem the resultant difficult start the next day has produced another problem.
I now have 'Engine System Service Required' on the dash and a hoplessly dead throttle and no Cruise Control. It takes anything from one to three seconds to respond and although I am driving around it I'd rather have the thing working right.
Reading the codes brought up a selection of 'throttle pedal position' and throttle pedal switch faults, so I fitted a new pedal which predictably made no difference whatsoever.
I have removed the ETM again and checked/cleaned but no difference.
I'm now thinking I should be fitting a new one but doesn't that need programming by Volvo?
What about the XEMODEX ETMs? Is that the way to go?
Or does anyone have any other suggestions. My idle is still rock steady which makes me think that maybe it's not the ETM at fault. MAF was replaced last year but that's no guarantee that it hasn't failed again.

I love this car and was so chuffed when I got it, but it is without a doubt the most unreliable expensive car I have ever owned!

Thanks all
Tim

jda2000 · Post by **jda2000** » 12 May 2010, 18:24

did you replace the accelerator pedal or the pedal position sensor?

Post by **jblackburn** » 12 May 2010, 18:33

Disconnect the battery and let the car sit for ~20 minutes and reconnect it. If you annoy them (e.g. the compressor or something), they'll go into limp mode and not respond well.

If that doesn't help, there is a sensor for the gas pedal that talks to the ETM that can sometimes act up too, probably just a coincidence that it has failed.

Most expensive cars aren't very reliable. Too many gadgets

spitv8 · Post by **spitv8** » 13 May 2010, 17:12

Hello again

The whole throttle pedal assembly which includes the position sensor was replaced. The only other position sensor is at the other end on the ETM - correct?
I have done the battery disconnect test a couple of times with no effect.

One other related thing it has done on a few occasions (usually when it has been working quite hard towing or similar) is that it will start and idle slightly roughly but with no throttle response at all. Pressing the throttle pedal does nothing at all. Switch off and restart and she'll go again OK.

Any clues?

Tim

jda2000 · Post by **jda2000** » 13 May 2010, 19:15

My understanding is that the pedal position sensor is on the back of the brake booster.

Try this, it might or might not work but at least it won't cost you a penny. Disconnect the wire harness to the sensor. Remove the sensor. Reinstalled the sensor ad its harness.

Some folks have had success, just by doing the above procedure.

Try it, it might work.