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My friends from Renntech, your assistance and advice please.

Car is a 2005 C2s tiptronic coupe, rhd, 75000 miles. Car is the wife's and is used as her daily/shopping/kids transport.

My wife restarted the car a few seconds after parking it and got the check engine visit workshop warning.

I connected the car to my PIWIS, and got p0020 & p0021. 

I searched on here and saw previous advice to clear the code and see what happens. So I cleared the codes.

A week later it is back.

I took some photo's on my phone camera.

This will get a bit pic heavy.

IMG_20161128_135254.jpg

IMG_20161128_135606.jpg

Edited by Captain Lockheed
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I note that post drive line check the idle camshaft values have changed. Idle is a wee bit lumpier but it is still really smooth.

Further info,

Oil pressure is good, top of the gauge when running, though I couldn't work out how to record that.

Oil is Mobil 1 0w-40.

Last service at 70,000 miles, current mileage 75,000.

All advice gratefully received.

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Sounds like you have issues with the bank 2 variocam actuator or its circuit. The workshop manual should have the actual steps. I would expect testing of continuity of the wires between the actuator and the DME, ohm out the actuator, and also apply voltage to the actuator and listen for engine change. To diagnose this further, you will need a wiring diagram.

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You need to look at the cam position sensor in question on bank 2, which either is not sending a signal, or possibly an intermittent signal.  I would be looking at the wiring to that sensor as well, as a chaff or break can also cause this type of fault.

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I hope this helps...  

 

P0020
Position of crankshaft in relation to intake camshaft
F NOTE
This fault is entered if there is a permanent deviation from the nominal value of 10° camshaft angle.
Diagnostic conditions
D Battery positive voltage 10 ... 16 V
D Engine idling
D Camshaft adaptation has taken place
D No fault in camshaft sensor
D No fault in crankshaft sensor
Possible fault causes
E Camshaft sensor faulty (internal phase shift)
E Solenoid valve for camshaft adjustment soiled (does not close fully)
E Timing set incorrectly

 

 

 


P0021
Inlet camshaft control
F NOTE
This error is entered if the actual value varies from the target value by between 5° und 14° of the camshaft for a duration of 2 to 5 seconds.
Diagnostic conditions
D Battery voltage 10 ... 16V
D Time after engine starts > 30 seconds
D Engine and engine oil temperature -9°C ... 106°C
D Engine speed 1160 ... 6000 rpm
D No solenoid hydraulic valve final stage error
D No camshaft sensor or crankshaft sensor error
Possible fault causes
E Mechanical fault in solenoid hydraulic valve (sticks, sluggish, blocked)
E Dirt in the oil circuit
E Sealing strips on VarioCam adjuster faulty (leaky, sluggish)
E Oil pressure too low
E Mechanical fault in VarioCam adjuster
Page

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2 hours ago, Ahsai said:

Sounds like you have issues with the bank 2 variocam actuator or its circuit. The workshop manual should have the actual steps. I would expect testing of continuity of the wires between the actuator and the DME, ohm out the actuator, and also apply voltage to the actuator and listen for engine change. To diagnose this further, you will need a wiring diagram.

Thanks, I have a wiring diagram.

I am working on getting a workshop manual.

2 hours ago, JFP in PA said:

You need to look at the cam position sensor in question on bank 2, which either is not sending a signal, or possibly an intermittent signal.  I would be looking at the wiring to that sensor as well, as a chaff or break can also cause this type of fault.

Thanks.

48 minutes ago, Porschelibrarian said:

I hope this helps...  

 

P0020
Position of crankshaft in relation to intake camshaft
F NOTE
This fault is entered if there is a permanent deviation from the nominal value of 10° camshaft angle.
Diagnostic conditions
D Battery positive voltage 10 ... 16 V
D Engine idling
D Camshaft adaptation has taken place
D No fault in camshaft sensor
D No fault in crankshaft sensor
Possible fault causes
E Camshaft sensor faulty (internal phase shift)
E Solenoid valve for camshaft adjustment soiled (does not close fully)
E Timing set incorrectly

 

 

 


P0021
Inlet camshaft control
F NOTE
This error is entered if the actual value varies from the target value by between 5° und 14° of the camshaft for a duration of 2 to 5 seconds.
Diagnostic conditions
D Battery voltage 10 ... 16V
D Time after engine starts > 30 seconds
D Engine and engine oil temperature -9°C ... 106°C
D Engine speed 1160 ... 6000 rpm
D No solenoid hydraulic valve final stage error
D No camshaft sensor or crankshaft sensor error
Possible fault causes
E Mechanical fault in solenoid hydraulic valve (sticks, sluggish, blocked)
E Dirt in the oil circuit
E Sealing strips on VarioCam adjuster faulty (leaky, sluggish)
E Oil pressure too low
E Mechanical fault in VarioCam adjuster
Page

Thanks.

 

As all three have suggested I will look at the sensor and wiring

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I found this picture, I hope it is attached.

If it is I will be looking at 14 Camshaft sensor plug,18 Solenoid hydraulic Valve Plug Camshaft Timing 20  Solenoid Hydraulic valve Plug valve lift control and 22 Ground strap.

harness.png

Edited by Loren
converted image to be viewable here
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Your's a 997-1 so it should be very similar to 996.2 (variocam+). Check bank 2 and see if it looks like the second last photo in this post by John 

If so, the one on the left is the variocam timing (as opposed to lift) and that's the one you should be checking. The bank 2 cam sensor is toward the front of the car on the engine head.

 

The cam angle should be very close to what spec'ed angle (which varies per rpm) and the deviation from the spec'ed angle should be less than 10 degrees.

 

For WSM, check with porschelibrarian.

 

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7 minutes ago, Captain Lockheed said:

From the other thread gcp's figures at idle Actual 2.0, deviation 13.97, mine -0.4141, deviation -0.5000. And +/- 6.0° is OK?

I am going to try to work out how to record both banks on the PIWIS.

 

Yes but your problem is at 3,000 rpm where the angle should switch but it didn't.

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3 minutes ago, Ahsai said:

Yes but your problem is at 3,000 rpm where the angle should switch but it didn't.

Thanks I am getting it now, I should really read stuff better. 

Approx 3000

Camshaft specified angle, bank 2 -16.7031°KW.

Actual camshaft angle, bank 2 0.6094°KW.

Camshaft deviation, bank 2 0.0000°KW

So on this example 17.3125° out

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