joelesmith

Sorry, for posting twice, I posted in the wrong form the first time.

I'm getting a P1325 on a 2001 996 turbo 24,000 miles. I seem to get the code on light acceleration (under 3000 rpm). I have swapped out both actuators on the bank 2 side with the two on the bank 1 side and the problem stays on the bank 2 side. It there any other troubleshooting I can do with the motor still in the car? thanks,
Joel

Kevin

When was the last time that you changed your oil? How is your oil filter?

P1325
178 Camshaft Adjustment, Bank 2 – Signal Implausible
Diagnosis conditions
• Time elapsed after start-up greater than 5 seconds
• Engine temperature greater than -10 °C
• Engine speed between 680 rpm and 6.760 rpm
• No fault in camshaft adjustment output stage
• Reference mark OK
• No fault in camshaft position sensors
• No fault in engine temperature
Possible fault cause
Camshaft does not reach early or late position
♦ Dirt in system
♦ Solenoid hydraulic valve mechanically blocked
Affected terminals
Diagnosis/Troubleshooting
Note!
Work instruction Display OK If not OK
1 Check solenoid hydraulic
valve camshaft adjustment
♦ Remove connector on solenoid
hydraulic valve
♦ Connect special tool 9675 to
the solenoid hydraulic valve and
to a power supply.
♦ Connect oscilloscope or engine
tester to the special tool 9675
♦ Set 12 V
♦ See Figure 1.
♦ Set switch on special tool 9675
to 1
See Figure 2
Step 2
Replace solenoid
hydraulic valve
→End

Kevin

Figure 2:
1 - Voltage not applied yet, valve in output state
2 - Exponential voltage increase, magnetic field is built up,
increase of the spring preload force
3 - Valve starts to move, spring force increases, valve reaches
end position
4 - Exponential voltage increase, current limitation through selfinduction
of the coil
178 Camshaft Adjustment, Bank 2 – Below Limit
Diagnosis conditions
• Time elapsed after start-up greater than 5 seconds
• Engine temperature greater than -10 °C
• Engine speed between 680 rpm and 6.760 rpm
• No fault in camshaft adjustment output stage
• Reference mark OK
• No fault in camshaft position sensors
• No fault in engine temperature
Possible fault cause
Solenoid hydraulic valve is triggered, camshaft does not switch into
early position

♦ Dirt in system
♦ Solenoid hydraulic valve mechanically blocked
Affected terminals
Diagnosis/Troubleshooting
Work instruction Display OK If not OK
1 Check solenoid hydraulic
valve camshaft adjustment
♦ Remove connector on solenoid
hydraulic valve
♦ Connect special tool 9675 to
the solenoid hydraulic valve and
to a power supply.
♦ Connect oscilloscope or engine
tester to the special tool 9675
♦ Set 12 V
♦ See Figure 1.
♦ Set switch on special tool 9675
to 1

Kevin

You have 3 component at risk here. First >>do you have any Type 2 over Rev's? How long have you owned the car?

1) You could have a failing Vario-cam module. They do fail. Rare but they do fail. You have to tear down the cam housings and retime the camshafts.

2) Replace the "hydraulic valve solenoid"

3) Check or replace the camshaft position sensor.

If you feel that #2 and #3 are in 100% working order> you might need to look at the variocam module.

PorscheDoc

Just had a car with this code at the end of the track season. When I pulled the top acutator, there was a fairly big sliver of metal attached to the actuator, so looks like the vario cam module took a dump.

joelesmith

I have owned the car for 3.5 years. after i got the error, the first time, I changed the oil and the filter. before that it was about 3500 miles since the last oil and filter change. I swapped both the actuators from bank 1 with bank 2. so I am pretty sure the actuators are good. When I took the top actuator from the bank 2 (passenger) side there was a very small piece of metal in the actuator. I am not sure about over revs, none since I have owned the car. total of 24,000 miles on car. can I look at the cam timing with the engine still in the car?

Kevin

Metal in the oil is the root to your CEL. If your solenoid or WIRING isn't the problem a look at the vario cam module might be needed.

I would replace the hydraulic valve solenoid that had ate the metal. Do you know if the metal was metalic?

I would also dump your engine oil (again) and pull apart your oil filter to inspect for "more metal" At a minimum replace your oil filter.

To check the cam timing and vario-cam one would have to drop the engine on a platform and remove the cam housing. Easier said than done. You also need the high dollar Porsche cam alignment tools.

joelesmith

The metal I found was magnetic, I found it by putting a pencil magnet in the hole that the top actuator fits into.
So, it looks like the last thing I can do before dropping the engine and checking the variocam is to check the wiring to the actuators. what would be the high suspect actuator wiring? the one on top or the side. The way I understand it is the one on top is to advance the timing and the one on the side is how much to advance. thanks for all the help/info.
Joel

Kevin

Joel, the top "hydraulic valve solenoid" which is located near the front vario-cam module>intake camshaft should be pulled.. I would also pull the low-high lift tappet "hydraulic valve solenoid" which is located on side of the cam housing.

With thinking outside the box with both solenoids pulled I would turn the engine over. Prior to this PLEASE REMOVE the fuel pump fuse. The oil pump will force/ puke oil out of these ports. Please remember that inside the cam housing there is a gasket that seals the head and cam housing. There are CNC'd galleys that contain the oil for these solenoids AND low/high lift tappets. WE are trying to do some blood "oil" letting. Go and buy some Huggies or Pampers to contain the Valdez oil spill.

I don't know how many hours or miles are on your oil, but I would dump it and FLUSH the engine with new oil.

Again my suggestion is outside the box. I know what you are against> hopefully you can purge the head/camhousings and get rid of the metal that is plugging the solenoids. Internally it is not circulating, it is flowing back and forth between the solenoid and vario cam or between the cam housing galleys.

I would be going out into the garage and removing the oil filter to inspect it for metal.

PorscheDoc

This is very intriguing idea indeed. We put the car away for the winter after the issue until we decide how to tackle it, but I am very interested in trying this procedure now to see what happens. I had cut the filter open on our patient and there was no metal in it, and oil changes have always been frequent after probably every other track event. 70k miles on this subject though a lot of those have been track miles.

I'll be interested in what you find as well Joel.

joelesmith

Kevin,
This is one idea that I am going to try, also. I thought I had exhausted all ideas and the only thing left was to remove the engine and start tearing the bank 2 variocam apart. Thanks for thinking outside the box.
Joel

joelesmith

I hooked up my new Durametric for the first time a couple of days ago. Does anyone know what a healthy turbo is suppose to read on

Camshaft position 1 deviation
Camshaft position 2 deviation
Actual angle for camshaft bank 1
Actual angle for camshaft bank 2
thanks,
Joel

Kevin

0 to .5 degree is perfect. I seen alot of 4 degrees deviation. What are you reading. What codes are you tripping right now.

joelesmith

Kevin,
camshaft position 1 deviation is 1.66
camshaft position 2 deviation is -0.86

getting error code P1325

When I activate bank 1 - I get a slight studder at idle
when I activate bank 2 - there is no change
Joel

Kevin

You aren't advancing the cam at idle.. What you are doing is locking the low lift tappet.

It really does sound like a variocam module issue IF you have changed all of your sensors. This means ordering new parts >not swapping. If your camshafts aren't swinging to there FULL position >retard and advanced you will trigger this error.

The deviation is okay. I have seen worse. They are off >> 2.52 degrees.