gcb50
Have a 2002 XC70 with a B5244T3 motor that is giving me grief.
Bought this car very cheap ($400) knowing it had a leaking exhaust camshaft seal and a history of rough idle.
Changed camshaft seal, VVT solenoid/valve, PCV Canister and piping, turbo control valve, plugs and coils, and used a high quality engine flush as the previous owner wasn't too fussed with oil changes.
Car started and ran like a new one for about 2 weeks, but then started to surge badly at idle, and very hard to start at times.
Checked codes and got the following Permanent Faults;
6410 Exhaust Camshaft reset valve, Signal to Low
6800 Turbo Charger Control Valve, Signal to Low
4000 Canister Purge Valve, Signal to Low
6110 Engine Cooling Fan Relay, Signal to Low
If I clear these codes the car will start and run but codes return, sometimes straight away, sometimes not for a day or two.
Considering that the first 3 have new parts, could it be possible that I have a faulty ECM or possible bad earth??
Any help would be greatly appreciated.
Ex850R
Welcome!
I am no expert but others here are, trained volvo technicians we have!
I would expect resetting would need to be done with the vvolvo specific scan and diagnostic equipment (Vida, with a DICE).
timbo
Did you lock the camshafts when you replaced the cam seal and did you set the vvt phaser up correctly when you put it back on?
gcb50
Thanks for your quick response.
Yes, I locked the cams with the special tool, and set up the VVT hub as per Vida instructions, when I 1st started the motor everything ran fine for approx. 2 weeks, then started to run rough again, none permanent code came on for Purge Canister (4000, although the one I took off looked clean with no carbon build-up) and turbo charger control valve (6800), replaced both, ran very well for 3 days, parked it for 6 days, started it and it started to surge (600 to 1400 revs) at idle, ran fine over 1500 revs, engine light came on and Permanent faults showed on scan.
Haven't looked at the cooling fan relay fault as yet as it is the transistorized one and not willing to outlay the dollars until I get these other problems sorted.
Appreciate any feedback you can offer. Greg.
gcb50
Thanks Snoopy, unfortunately the nearest Volvo Dealer is 530klms away, have spoken with them and they are not willing to give a ballpark figure on reset if I put it on a trailer and take it to them. From past experiences with my other Volvos, it is often a lot of cost for little benefit, so I am leaving that option open as a last resort.
Greg.
Philia_Bear
Did you replace the VVT on the top of the engine or also the one on the front of the cam?
Frequently it will record a failure of the electronic valve when its actually the Cam part of it (I have replaced many of them)
timbo
I would check that all the sensors are getting their power supply from ecu first and go from there.
Did you clean the throttle body as it can cause a hunting idle if oily.
Do you have access to Vida as it details the further diagnostic procedures
gcb50
Hi Bear,
Have replaced the VVT on top of the motor twice, 1st one (New) burnt out melting the wiring connector and solenoid, cause unknown, the second unit (tested) came from Volvowrek (Vic), and has had no problems since fitted. Will replace with another new one once I get to the root cause of the problem.
VVT Hub on the front of cam was flushed and rotating freely before refitting as per Vida instructions.
Greg.
VolvoDeger
If logging those codes I would be almost 100% sure timing vvt out, I know following vida can be misleading.
I know its a pain in the butt..........if you have vida connect and read out vvt degrees and make sure in range otherwise do the timing again.
I must ask did you loosen off the 10mm bolts on the vvt unit?
gcb50
Thanks Tim,
Will check and clean throttle body and let you know. I have the Vida Workshop Manual installed on my old laptop, but it also has died, and I am learning how to set up a "virtual machine" on my new computer, so hopefully will be able to access it again. Hopefully it will detail how to check on power from the ECU to the various sensors.
Have ordered the removal tool for the ECM and BCM so that I can clean and check the terminals on them.
gcb50
Hi Deger,
I don't have Vida connect, only the workshop Manual on CD. I do have a Maxidiag Pro, which gives me live readings.
I picked up the car with the cams out of it and the VVT Hub removed from the cam. Have built my own cam locking tool which hold the rear of the cams, copied the factory designed tool and fabricated my own, and it locks the cams in the correct positions. VVT Hub was fitted with 10 mill bolts at mid position, and set at 4 teeth forward of the at rest position.
VolvoDeger
why 4 teeth of forward position? is the cam mar lined up with the top notch
VolvoDeger
So the process you lined the gear up is as follows, cams locked at rear then fit cam vvt unit then rotate hub unit with so the timing mark at about 9 oclock. Then tighten the centre bolt enough so that the gear can still rotate on the cam firmly, now rotate clockwise till you feel the play come to a stop in the vvt unit then keep rotating until cam gear is aligned with timing mark so at this point tighten the centre cam bolt very tight without releasing any pressure of vvt unit.
This should be all set for you now...........is this how you did it or not.
cheers steve
Masons Prestige Volvo
going home now so I will check your repsonce in the morning
timbo
"4 teeth forward of the at rest position" worries me too
Greg your issue with Vida not working may be due to the expiry of the cracked software licence earlier this year or did your laptop itself die?
Also burnt out wiring suggests there was a short circuit which would explain the supply voltage fault codes. Have you checked the fuses?
I have seen people accidentally short the wires when refitting the cam/coil cover