Ran fine, then code P0343

[apriliapilot]

Skipping a lot of the prelude to this query....

I started up my car after doing a major service including the timing belt and cam chains. It ran like hot garbage for a minute until the ECU sorted everything out and then it ran beautifully for about 10 minutes. I turned it off and restarted it twice after which it ran and idled beautifully.

While I was letting it idle after the second restart, it just shut down like I had turned off the key. I checked but there were no codes. I poked around for a minute to make sure som,ething hadnt come unplugged then tried starting it again. it turned over vigorously but wouldn't start. After cranking on it a little bit I finally pulled a P0343 "Cam position sensor Circuit High".

Just to give it a whirl I put the Cam position sensor out of my failed motor in and got a p0342 "Cam Position Sensor circuit low".

I had a brand new CPS that I installed and still get the P0343 code. I get this regardless of if the sensor is plugged in. I double checked my timing belt and it isn't off, and I am quite certain my timing chains are on correctly as well, because the first time I tried this job I Installed them one tooth off and was getting codes about "too advanced"

I visually checked and then checked the resistance of the wiring to make sure the wiring was good and so far as I can tell the wiring is fine.

This is driving me insane. Is there something I am not considering or don't understand about this system?

[jason96r]

How easily did the engine crank?

[apriliapilot]

How easily did the engine crank?

Turns easily, cranks vigorously. I've tried it both with just the battery and hooked up to a charger with an 80 amp "engine start" function

[Theiceman]

Timing chains ??? Is this a 2 or a 3.2 ?

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[Mke07]

This is lifted straight from google:

What causes the P0343 code?
Usually, the camshaft position sensor has been fouled from oil or moisture, causing a bad ground or voltage in the signal wiring. However, other likely causes include:

Faulty camshaft position sensor
Faulty ground wiring
Faulty power wiring
Faulty starter motor
Weak or dead battery
Faulty engine computer

Did you turn the engine by hand before starting to check for interference? Pretty sure you'd have gotten more codes if your timing was in fact off. Hopefully someone more knowledgeable can help but I'd double check the condition of the plug and wires if the sensor itself is known to be good.

[apriliapilot]

This is lifted straight from google:

What causes the P0343 code?
Usually, the camshaft position sensor has been fouled from oil or moisture, causing a bad ground or voltage in the signal wiring. However, other likely causes include:

Faulty camshaft position sensor
Faulty ground wiring
Faulty power wiring
Faulty starter motor
Weak or dead battery
Faulty engine computer

Did you turn the engine by hand before starting to check for interference? Pretty sure you'd have gotten more codes if your timing was in fact off. Hopefully someone more knowledgeable can help but I'd double check the condition of the plug and wires if the sensor itself is known to be good.

Yeah I always do a few full rotations by hand when I've done a timing belt. Like I said, it ran beautifully for about 10 minutes before it just shut off.

It's a 2.0

Ive checked the grounds and power and they all seem ok. Unless there is something about the system I'm not understanding, I'm starting to wonder if I got a bad new sensor.

[Theiceman]

Okay still gathering info here . You state timing " chains" and installed " them"

You do know there is only one timing chain on a 2.0T right ?

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[EvolutionArmory]

The car worked fine before you did the work. Now you have a cam code. Check your work.

This cam code happens when you are off on timing or the sensor is bad or the wiring is bad. You tried a few sensors and you still have codes. You tested the wiring and said it is good. What does that leave?

Check your head timing. Look at cam phaser position value on VCDS. If it’s off, your cam timing is probably off.

[Theiceman]

When I am doing this work I NEVER do timing chain and belt together. I treat them as separate jobs. I am capable but never want to mess with too many systems at once without testing in between.
You tried one off another engine and a new one !
I did a chain timing job and 20 minutes later the crank sensor died so it does happen but does sound like you have eliminated the sensor

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[apriliapilot]

Okay still gathering info here . You state timing " chains" and installed " them"

You do know there is only one timing chain on a 2.0T right ?

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I obviously would know it is a single chain if I had just changed it. The plural form was a brain fart. I didn’t know this was Grammarzine.

It ran fine AFTER I replaced the chain and t-belt. Note I said I ran it for about 10 minutes then shut it off and restarted it twice letting run for a few minutes each time. It was after the second restart that it just turned off.

There are no other codes. On a different motor I got the timing chain a tooth off so I know what those codes are.

Before coming here to ask for wisdom I did recheck my work. Again, I would never just do a timing job and throw all the covers on and hit the starter.

I’m working my way through the harness to try to figure out if the power it shorting to the signal wire or something.

I mostly have eliminated the sensor, I still have some distrust only because I’ve had a bad brand new sensor before. Super unusual I know, but it still happens.

Does anybody know what the signal voltage should be?

[jason96r]

Not positive on this car, hard to find even simplest wiring diagrams. Most cars it's around 5 volts

[esandes]

I had some similar work done and the shop told me to "take it easy to let the cam set". I did and it's running well.

I wonder if you need to adjust the intake cam. Maybe it didn't set right.

Just my 2 cents for what it's worth.

[EvolutionArmory]

Esandes. It’s either done right or it’s not. It either works or doesn’t. There’s no “setting”.

[joepickems123]

so is the car currently grounded like your airplane license?

[Theiceman]

Not your brain fart but your arrogant dipshit attitude just got you less help .
Good luck dipshit

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[BeeSevenKyle]

Skipping a lot of the prelude to this query....

I started up my car after doing a major service including the timing belt and cam chains. It ran like hot garbage for a minute until the ECU sorted everything out and then it ran beautifully for about 10 minutes. I turned it off and restarted it twice after which it ran and idled beautifully.

While I was letting it idle after the second restart, it just shut down like I had turned off the key. I checked but there were no codes. I poked around for a minute to make sure som,ething hadnt come unplugged then tried starting it again. it turned over vigorously but wouldn't start. After cranking on it a little bit I finally pulled a P0343 "Cam position sensor Circuit High".

Just to give it a whirl I put the Cam position sensor out of my failed motor in and got a p0342 "Cam Position Sensor circuit low".

I had a brand new CPS that I installed and still get the P0343 code. I get this regardless of if the sensor is plugged in. I double checked my timing belt and it isn't off, and I am quite certain my timing chains are on correctly as well, because the first time I tried this job I Installed them one tooth off and was getting codes about "too advanced"

I visually checked and then checked the resistance of the wiring to make sure the wiring was good and so far as I can tell the wiring is fine.

This is driving me insane. Is there something I am not considering or don't understand about this system?

In your original post, you referred to the timing chain as being plural multiple times. You said "i an quite certain my timing CHAINS are on correctly" and later said you installed "them" one tooth off. You clearly made it sound as if your engine had 2 chains.

Even if you were just having a brain fart (happens to the best of us), there is no reason to be rude to iceman like that. He is a great member who is always willing to help out a fellow Audi owner.

Good luck sorting out your issue, and I mean that sincerely. Next time you come looking for help though, try and be a little less rude to members that are just trying to help you.

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[joepickems123]

says the guy who sticks up for a guy who cant fix his own car either. i swear where do u guys all come off. leave pilot alone he comes with a better story than the rest of u washed up ppl on this forum

[EvolutionArmory]

....says the crackhead who still hasn’t paid for the turbo he stole from a member here.

[EvolutionArmory]

Who cares if he said timing chains? He also said he changed the belt which also means he doesn’t have a 3.2.

Context clues 🤣 It’s been cleared up anyway so can we just move forward now?

Just check your engine and cam timing again. Doing both the belt and the cam chain at the same time, it’s real easy to be off a tooth somewhere.

Verify your timing is correct before you start diving into electrical issues. Look at your cam phaser values in VCDS if you have it. It can help you see if you’ve set timing up correctly.

[EvolutionArmory]

How are you checking the cam sensor with your meter? You should have the ground cable hooked up to the vehicle battery and you should be back probing the signal wire. With the car running if it’s at 10 volts it’s probably bad (signal too high). If it’s at zero volts it’s probably bad (signal too low).

If it’s between 5 and 7 volts at idle, the sensor is probably working.

[EvolutionArmory]

And I would ABSOLUTELY make sure you attached the ground wire bracket that is attached to the lower vacuum pump bolt back on correctly. It’s very easy to forget to do this when you do a timing chain job.

[joepickems123]

crackhead concurs. i think he is on to something ^^

[EvolutionArmory]

crackhead concurs. i think he is on to something ^^

If it doesn’t involve putting a crack pipe to your mouth, you don’t know anything. I’m glad you concur that you’re a crackhead. Admitting you have a problem is the first step to recovery.

[EvolutionArmory]

Joepickems fixing his car.

Attachment 125484


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[joepickems123]

i just laugh how someone even a mechanic goes to fix his car in maintaince and turns out to open a can of worms

[apriliapilot]

Wow. I go away for a few days and The Internet rears it’s ugly head.

I wasn’t dumping on Iceman, I appreciate his knowledge/experience/insight. My grammarzine comment was meant to be good natured. I can see how it could come off another way. Anyway...

I was hoping I had an electrical problem as I was really tired of wrenching and didn’t want to have to open it all up again.

I dug through my Bentley and looked up all the electrical info I could find, including all the ground locations. I was hoping the cam sensor had an ohm specification like the crank sensor does to verify if it has failed. The Bentley doesn’t give such a spec so I got my new sensor exchanged just in case.

I hadn’t thought about checking the phase, but after I checked it wasn’t giving a phase signal in VCDS. It was acting like there was no sensor.

Long story short, I used a wrong torque figure on the cam adjuster gear bolt and the head sheared off while it was running.

Fortunately, afaik and to the best of my analytical skills, pistons and valves made no contact. I pulled the motor again and went back through it for metal and to make sure everything is ok (again, “ok” without actually tearing it down to zero and having it hot tanked or something). Put it back together, and drove it around today.

Seems ok. Only time will tell.

[Hockeydad1519]

Wow. I go away for a few days and The Internet rears it’s ugly head.

I wasn’t dumping on Iceman, I appreciate his knowledge/experience/insight. My grammarzine comment was meant to be good natured. I can see how it could come off another way. Anyway...

I was hoping I had an electrical problem as I was really tired of wrenching and didn’t want to have to open it all up again.

I dug through my Bentley and looked up all the electrical info I could find, including all the ground locations. I was hoping the cam sensor had an ohm specification like the crank sensor does to verify if it has failed. The Bentley doesn’t give such a spec so I got my new sensor exchanged just in case.

I hadn’t thought about checking the phase, but after I checked it wasn’t giving a phase signal in VCDS. It was acting like there was no sensor.

Long story short, I used a wrong torque figure on the cam adjuster gear bolt and the head sheared off while it was running.

Fortunately, afaik and to the best of my analytical skills, pistons and valves made no contact. I pulled the motor again and went back through it for metal and to make sure everything is ok (again, “ok” without actually tearing it down to zero and having it hot tanked or something). Put it back together, and drove it around today.

Seems ok. Only time will tell.

did you ever figure out why there was no phase being shown? i have the p0016 code and p0343 and i have been noticing that phase aint showing up either, i have checked the chain in back multiple times and its in time.

[Theiceman]

did you ever figure out why there was no phase being shown? i have the p0016 code and p0343 and i have been noticing that phase aint showing up either, i have checked the chain in back multiple times and its in time.

To be honest 90% of the time when guys in here Say i checked and it's fine, it usually isn't.
Having said that though.
If the p0016 did not come up after doing work. And it all checks out with static timing.
It could be the cam advance mechanism.
Or of course a sensor and wiring but that can be checked.

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