club.liberty.asn.au

Hello,
A month ago my CEL came on with al the other blinky lights, local garage plugged in scanner found fault and replaced cam position sensor bank 1.

It went well for about 300ks and then it started again. Now it chucks the CEL every other time, but it will miss without a CEL and sometimes stall at idle.
Put the scanner back on it. And the same fault has appeared.


Just wondering if anyone has encounted this so we can cut down some time fault finding. Genunine subaru sensor was used on the first change.
Ive looked through a few threads, and ive pulled a lot of sensor plugs off to look for any oil residue but they have been very clean.

thanks

If the cam isn't moving as it should (according to that CEL, it isn't. Ideally you'd be logging the car live while driving, not just a one off with a scanner when it's off - that way you can make a more accurate diagnosis) - one of three things is the problem.

1. AVCS solenoid
2. Cam sensor
3. Cam gear

That's also the easiest, cheapest order of checking and replacing parts during diagnosis.

1. Swap solenoids side to side to see if the problem moves with the solenoid or stays on the same bank

If problem switches side, you know it's the faulty solenoid. Replace it. Done.

If problem doesn't move sides with the solenoids, move to step two.

2. Switch out cam position sensor, with a known working one or get a new one. If problem goes away, great. If problem persists - step 3.

3. Replace the faulty cam gear. It might be tempting to try and clean it, but it is advisable to buy new. Considering you need to get your timing chain off to replace the gear, I imagine most people would rather do it once correctly, than pay for major service labour twice when they find the cam gear didn't clean up as well as hoped.

Prices are usually much better on partsouq.com, just make sure you get the correct part number first. Delivery is usually 5-10 business days, when the part is listed as in stock.

Another thing to note, check that there are no banjo bolt basket filters blocking the oil flow in the AVCS system. I'm not an expert on the H6, so Im not sure if there are basket filters in the H6. Might just be a thing on the turbo models. Maybe someone here knows, or ask a Subaru specialist. If there are basket filters in any banjo bolts on the AVCS system... These should have been checked first, before replacing your sensor.

Item 19 UNION SCREW AND FILTER ASSEMBLY

They use the word FILTER

post images

just a quick reply here, ive pulled off the banjo fittings on both sides at the front of the engine by the solenoids and neither had little fitlers in them.

are there AVCS solenoids front and back? are the interchangable?

Thanks Peter

agusta wrote:just a quick reply here, ive pulled off the banjo fittings on both sides at the front of the engine by the solenoids and neither had little fitlers in them.

are there AVCS solenoids front and back? are the interchangable?

The solenoids are on top of the head, towards the front. Should be fairly easy to get to. Can't remember if they're out in plain sight on both sides.

Google what they look like, or lookup a walkthrough (there are a few on Nasioc.com or legacygt.com, even on this forum there's one or two).

Pretty easy to take out, and sides are interchangeable.