Multiple fault codes in 2005 Cayenne Turbo

[SpawnyWhippet]

Hi,

 

I recently bought a 05 CTT with 80k miles. It was running a little rough, so I changed the plugs, under seat battery and a coil pack that was giving an intermittent misfire code on cylinder 3.

Today, after a 75 mile highway drive, the Check Engine light came on. I pulled the following codes with Durametric, any ideas what I need to check?


Bosch Digital Motor Electronics 7.1.1
Current Fault Codes

P0344: Camshaft Position Sensor "A" Circuit Bank 1 or Single Sensor - No signal/communication, test conditions are not-completed, fault is not currently active and is not causing a DTC light

P1119: Implausible signal, test conditions are not-completed, fault is not currently active and is not causing a DTC light

P1119: Implausible signal, test conditions are not-completed, fault is not currently active and is not causing a DTC light

P0016: Crankshaft Position Camshaft Pos. Correlation Bank 1 Sensor A - Value below lower limit value, test conditions are not-completed, fault is currently active and causing a DTC light

P2329: Air Leak Between MAF and Throttle Body - Upper limit value exceeded, test conditions are not-completed, fault is currently active and is not causing a DTC light

P0300: Random/Multiple Cylinder Misfire Detected - Implausible signal, test conditions are not-completed, fault is not currently active and is not causing a DTC light

P0303: Cylinder 3 Misfire Detected - Implausible signal, test conditions are not-completed, fault is not currently active and is not causing a DTC light


Porsche Stability Management (PSM/ABS)
Current Fault Codes
1314: DME control module. Please read out fault memory

Vehicle Electrical System
Current Fault Code
(red exclamation but no error message)


I am not an expert with the Durametric, so I couldn't see how to get more info on the PSM and Vehicle Electrical System codes.

[SpawnyWhippet]

Answering my own questions. my drivers side turbo has a cracked housing and needs to be replaced. Lowest quote so far was close to $6k, so I have bought a remanufactured turbo and will attempt this myself. I may do a DIY.

[SpawnyWhippet]

So I have replaced the turbo and am still getting some of these errors and a misfire.

The car has been twice to my local stealership and both times they didn't bother to correctly diagnose it. They just looked at the coil packs and said they are old, need changing. However they are new old stock and the fault does NOT move if I switch the coil packs with known good firing cylinders. The fault is always with cylinder 3.

 

Could this be injectors or something more ominous, eg low compression or valve problems?

 

 

 

Bosch Digital Motor Electronics 7.1.1

 

Current Fault Codes

 

P0016:

Crankshaft Position. Camshaft Pos. Correlation Bank 1 Sensor A - Value below lower limit value, test conditions are not-completed, fault is not currently active and is not causing a DTC light

 

P0300:

Random/Multiple Cylinder Misfire Detected - Implausible signal, test conditions are not-completed, fault is not currently active and is not causing a DTC light

 

P0303:
Cylinder 3 Misfire Detected - Implausible signal, test conditions are not-completed, fault is not currently active and is not causing a DTC light

Edited March 29, 2016 by SpawnyWhippet

[Love_my_P_Car]

So let me get this straight... The shop still thinks the coil packs are bad? That's the easiest thing to check. If you pull the power to one of them, and the engine runs rough, it was a good coil. If it doesn't change, it's a bad coil. I think you need a new shop

[SpawnyWhippet]

Worse than that even. I told them before they worked on it that the coils and spark plugs had been replaced with no change, still getting misfire on cylinder 3. I then told them that I switched coil 3 and coil 1 and the misfire stayed on cyl 3.

I think they completely ignored me, plugged in their computer, it said 'misfire on 3' and they stopped work after looking at the coil part number.

They are the Porsche main dealers for my area.

 

I have just done a compression test on cyl 1 and 3, both showing 140 ish, but I didn't remove all the other plugs to do it

Edited March 17, 2016 by SpawnyWhippet

[SpawnyWhippet]

I did a test drive after moving the coil packs again, this time no misfire on cyl 3, just the following 2 codes:

 

Bosch Digital Motor Electronics 7.1.1
    
  Current Fault Codes  
 P0344:
Camshaft Position Sensor "A" Circuit Bank 1 or Single Sensor - No signal/communication, test conditions are not-completed, fault is not currently active and is not causing a DTC light
 
 P0016:
Crankshaft Position �Camshaft Pos. Correlation Bank 1 Sensor A - Value below lower limit value, test conditions are not-completed, fault is currently active and is not causing a DTC light

 

Does this look like a cam sensor? I believe that's another large job involving intake manifold removal? Not much appetite to do that after my recent turbo replacement DIY...

[hahnmgh63]

Bad wire to Coil pack #3?  Not too uncommon. Intermittent electrical problems like that are some of the hardest to diagnose.

[SpawnyWhippet]

Is there an easy way to test the signal to the coil?

[Ahsai]

I use this. Not cheap but super handy and quick for trouble shooting when you need it.

http://www.amazon.com/Waekon-76562-Quick-Variable-Sensitivity/dp/B0021UPE58

[SpawnyWhippet]

Great, thanks. I ordered that and the matching electronic ignition test tool

[Ahsai]

Um, which matching ignition test tool? I only saw the fuel injector tool and the secondary ignition tester, whch doesn't apply to our COP.

Btw, there's a sensitvity adjustment on that COP probe. You can use the good coils to kind of calibrate it and it will be very obvious when you move it over to the bad coil.

[SpawnyWhippet]

When you look further down the page, you can see the Amazon recommended purchases for what other things this customer might buy.

I do not think I have any bad coils. I already replaced the coil on the non-firing cylinder, and that coil worked fine on other cylinders. I need to test the wiring harness and injectors next.

Edited March 23, 2016 by SpawnyWhippet

[Ahsai]

This one? http://www.amazon.com/Waekon-76462-Universal-Electronic-Injector/dp/B0021V0FRE/ref=pd_sim_263_1?ie=UTF8&dpID=31qh%2B67a6VL&dpSrc=sims&preST=_AC_UL160_SR160%2C160_&refRID=0ZJ1P7MA9JH22N98XB1X

[SpawnyWhippet]

Yep

[Ahsai]

Nice! Let us know if it works well if you can please.

[SpawnyWhippet]

Both tools arrived today. The coil pack tool worked well and proved the coil pack is working, as I already expected.

The fuel injector tool kind of worked, and I think it means the injector is working.

 

I'm leaning towards the cylinder 3 misfire being caused by the crank and or cam position sensors...

 

While I was checking, I noticed both valve cover gaskets have started leaking at the rear of the engine. Doesn't this thing ever give me a break??

[Ahsai]

Thanks for the update. I'm not familiar with cayennes but from the code descriptions, both codes seem to point to the bank 1 cam position sensor. Have you checked the connection from the DME to that sensor? To test the cam sensor, you will need an oscilloscope. I have reco for that if you plan to do more trouble shooting.

[SpawnyWhippet]

Yes, I plan to trouble shoot further. It's a very annoying thing to drive now, stinking of burnt oil and misfiring.

I have a Durametric Pro and Fluke car multimeter that may have an oscilloscope function - it has pickups for coil leads.

I also can borrow a Snap on Vantage Pro or Verus from a friend, but I have no idea how to use a scope on a car.

[Ahsai]

This scope looks pretty good and I also saw some youtube on ppl using it. It needs some learnng but it's quite easy to use.

http://www.amazon.com/1008C-Automotive-Diagnostic-Oscilloscope-Programmable/dp/B00BSR98KW

Here's a video of Tony Callas probing the cam sensors.

https://m.youtube.com/watch?v=k3i9A60KJZ4

[Ahsai]

With that scope, you can even see the coil ignition wavwform. Here's a video of how to do it

https://m.youtube.com/watch?v=PALjk13DDiQ

[SpawnyWhippet]

Great, I'll pull out a scope from my friends garage and have a play. Not entirely sure what I would need to do with that information even if I manage to get a waveform on the screen.

[Ahsai]

Just compare the waveforms of both banks. They should overlap (you set a different zero offset to separate them vertically on the screen).

[sportplus997]

Have you borescoped cyl 3? How did that plug look compared to others when you changed them

[SpawnyWhippet]

Have you borescoped cyl 3? How did that plug look compared to others when you changed them

Yes, nothing particularly conclusive. The plug was a light brown color, similar to the plug from cyl 1.

 

I have just picked up new valve cover gaskets, camshaft and crankshaft position sensors which I'll install tomorrow and see if there is any difference.

[SpawnyWhippet]

OK, I replaced the camshaft sensor for bank A (cyl 1-4) and also the valve cover gaskets on both sides. (Despite the relatively low mileage, these gaskets were well overdue for replacement and the old ones had gone completely hard, brittle and cracked. They came out in many small pieces.)

I didn't yet replace the crankshaft position sensor.

 

I now no longer seem to have a misfire, but I still get the camshaft correlation error, the car will not rev over 4000 rpm, is noticeably down on power and the CEL is on.

 

P0344:
Camshaft Position Sensor "A" Circuit Bank 1 or Single Sensor - No signal/communication, test conditions are not-completed, fault is not currently active and is not causing a DTC light

P0016:
Crankshaft Position Camshaft Pos. Correlation Bank 1 Sensor A - Value below lower limit value, test conditions are not-completed, fault is currently active and causing a DTC light

 

I cleared the codes, went for a drive and the CEL came on again.

I pulled the codes and just got P0016, not P0344. Car is still down on power and stops revving at exactly 4000rpm.

 

I noticed when I did the drivers side gasket that there was a bypassed wire to the rear of the engine, just behind the secondary air pump. It bridged a short harness between 2 connector blocks. I couldn't tell where it was going to or from as there is a real rats nest of factory wiring there. The bypass looked intact, and it was not on the side that is giving the faults. Anyone know if a wiring fault on the drivers side would cause issues on the passenger cylinders?

Edited March 31, 2016 by SpawnyWhippet