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:blink: I don't know what else to do. I replaced cam reset solenoid"VVT", cleaned the two cam profile solenoid, replaced camshaft position sensor. And I still have p0012, p001E, p001B, p0076. It doesn't trigger the CEL but it's in my scanner, also drivability sucks, feels sluggish on high throttle, it won't pass 4K rpm up hil. I already flushed engine twice and put fresh oil and filter, replaced fuel filter too, spark plugs are 1 1/2 old. I changed the fuel cap too. Looks like I have a bad purge valve
The codes point to a short to ground on the vvc control circuit on bank A (Bank 1).
I would start by disconnecting the camshaft profile solenoids for each bank and measuring the resistance of each. You may find the solenoid on bank A has a low resistance in which case replace the solenoid. If that isn't the case the next stage is to check out the wiring harness for damage between the solenoid and the engine computer. If a visual inspection shows no damage you may need to disconnect the harness at the computer and the vvc solenoids and check the ressistance between the control wire and ground.
" We're trying to plug a hole in the universe, what are you doing ?. "
(Walter Bishop Fringe TV show)
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Video is a great place to start, as it describes how to perform the tests Andy suggested with a basic digital multimeter.
Those two sensors are the only one left to change. Also, the wire color from the solenoids would be the same colors going to the ECM? Because my ecm is easily access in eng bay on top of the air filter box. I ll post the ohms reading here.
Daniel wrote: Those two sensors are the only one left to change. Also, the wire color from the solenoids would be the same colors going to the ECM? Because my ecm is easily access in eng bay on top of the air filter box. I ll post the ohms reading here.
The wires would likely be the same color at the PCM connector, however you should consult a diagram to avoid a misdiagnosis.
BBB industries has a large data base of free diagrams.
I ohm the two sensors and they are both 9.2 ohms. Bank1 and bank 2 solenoids are the same valve but I get bank 1 code, so I switched the solenoid and still get the same code, my Volvo has only intake variable and no exhaust side so I am confused that there are two same a like sensors that are mounted on the intake side.
petrol Volvo with vvc control running rough and not idling very well
scoped actuator signals all good
replaced phaser pulley and new valve
pulley slack and valve full of carbon / oil sorted my problem
Daniel wrote: I ohm the two sensors and they are both 9.2 ohms. Bank1 and bank 2 solenoids are the same valve but I get bank 1 code, so I switched the solenoid and still get the same code, my Volvo has only intake variable and no exhaust side so I am confused that there are two same a like sensors that are mounted on the intake side.
Did you happen to check the control wire for a short to ground like Andy mentioned earlier?
At this stage everything seems to point to a short either in the wiring or PCM. Hopefully it is a simple wiring fault not a PCM fault such as water ingress.
Having a known good solenoid gives you a head start, identify the control wires on each and with the solenoids unplugged measure the resistance between the control wires and the cylinder block and also the control and ground return wires.
Then reconnect and disconnect at the PCM and do the same tests.
It may be as a last resort you have to go for more invasive tests such as cutting the control wire for bank A solenoid close to the PCM to test if the short to ground is in external wiring or internal to the PCM.
" We're trying to plug a hole in the universe, what are you doing ?. "
(Walter Bishop Fringe TV show)
Last edit: 8 years 6 months ago by Andy.MacFadyen.
I was trying to navigate to my previous post. This issue has been resolved! I managed to get a schematic and diagnosed that I have a loose fuse "slot" 15amp fuse that powers both cam profile solenoids, Vvt solenoids, purge valve and leak detection. That explain I changed most parts and it would works and stop, this explain one day I have a CEL and sometimes not but scanner was able to pick it up. Anyways, I fixed the fuse holder tab, had a good contact now! Works like a champ.
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