electronic gremlins rear their head!

[Pixel-Snapper]

My S60's been in the garage for 3 days now trying to find the source of 2 fault codes and still no joy!

The emissions light on the dash has been on for sometime now, so it went in (Friday) my garage had flagged up a faulty Evap value on their computer, had to order the part so it went back in Wednesday to have a new one. That fitted I thought all would be well.... how wrong I was! value fitted the light was still on!!! although this time my garage's diagnostic machine couldn't read the fault codes. Luckly there's a specialist round the corner with a volvo computer, they said that there's fault codes for the VVT actuator and a turbo sensor not having enough current.

Just wondering if this is something anyone has come across before?

[pmjg66]

dependant on year etc there was a software upgrade for the vvt valve code being set.

It was a complete software upgrade of the ECM.

I would have this done then diagnose from there.

[morgrp]

what engine is it?

My C70 T5 kept faulting coding with a different code each time - I concluded it was a bad earth on the ECU - as it has been earthing through various different circuits on the car.

The earthing through each circuit will obviously effect the current

I'd check all the earths before going any further.

VVC codes are quite common and can be caused by a sticking VVT control valves. Often an oil change will cure it as they get gummed up

Edited by morgrp on Wednesday 11th July 22:16

[pmjg66]

morgrp said:

what engine is it?


VVC codes are quite common and can be caused by a sticking VVT control valves. Often an oil change will cure it as they get gummed up

Edited by morgrp on Wednesday 11th July 22:16

Yes they were very common therefore the software was upgraded to stop this code.

even cars with full Volvo service history could still fault.

The software allows more tolerance from the vvt readings.

Edited by pmjg66 on Thursday 12th July 02:27

[Pixel-Snapper]

Bugger sorry guys forgot I'd started this thread oops...

Its a 2001 2.0T with 165K on the clock.

Oil was done in November last year and has done around 8-9k since then but would have to check.

Got the fault code descriptions now.

ECM-4000 Canister purge signal to low

ECM-644A Camshaft control faulty signal

ECM-6800 Turbo control valve signal low

I've been having a look around the forums for information regarding these. Plan of action is as follows:

1, Disconnect battery for half an hour to reset everything. In this time disconnect and reconnect all the block connectors attached to the various valves and sensors within the engine bay. Reconnect the battery and get it code read again.

2, If that's not done it, replace the VVT control unit and the turbo control unit.

Maybe I should add in section 1A and replace the oil and check for earthing, however I'm sure my mechanic has already tried this to no avail.

Thanks for your thoughts.

Matt

[Pixel-Snapper]

might give this a crack too as ive started hearing a dump noise

http://www.volvoforums.org.uk/showthread.php?t=122...