08 Boxster P00010 code.

[JFP in PA]

Then I would say put the car back to the way it was, clear all the codes and see what happens.  This is strange.........

[vza]

Any truth in disconnecting batt for an hr to hard boot the DME or is that an urban myth. 

Edited Wednesday at 03:44 PM by vza

[JFP in PA]

18 minutes ago, vza said:

Any truth in disconnecting batt for an hr to hard boot the DME or is that an urban myth. 

Disconnecting the battery will clear codes and reset some modules to their default profiles (Disconnecting the battery will still erase the "adaptive" or "learned" driving style settings, but it will not fully reset the DME to factory defaults.)  but does not reboot anything in the DME, the system is purposely designed that way.

[vza]

Im back!! So I figured let me go backwards one step at a time. I left the red/gry splice in and returned the red/blu back using original loom wire. Car started and ran no problem with exception of the same CEL p0010 triggered almost immediately.  Cleared it and now getting pending p0010. Tested voltage:

Ignition on.   Red/blu 12v

                      Red/gry 12v

Engine Running. Red/blu 12v

                       Red/gry 5-8v(fluctuating)

Totally boggled,does this mean

red/gry is the signal wire being the voltage is changed when running( from 12v to 5v)? Diagram shows red/blu at 5v. Brn/pink is ground. What next ?

Edited Friday at 08:36 PM by vza

[JFP in PA]

 

Pin 53 is power, common for most sensors
Pin 21 is the signal (incoming to the DME)
Pin 34 is ground, common tor most sensors

 

It concerns me that you are not seeing a 5 volt reference signal between pins 1 and 3 when back probing the sensor connector.

[vza]

My diagrams different unless I'm not understanding correctly. Ill post the one im looking at.Im troubleshooting wires #10 #12 and #17  from DME. I am seeing a fluctuating

5-8v on pin 12 with engine running. I see 12v on same pin with only key energized.  Im backprobing + wire on  multimeter to whatever pin on sensor plug im testing at the time(pin 10 or 12) and (-) going to common ground on engine block. I might add I saw 12v STILL on pin10 red/blue with the plug unplugged at the DME with key energized ..this led me to believe the power was coming from a different source other than DME(It was unplugged)

Maybe I'm on a completely incorrect diagram?

Edited Friday at 09:55 PM by vza

[vza]

OK....Silly question...the diagram circled and posted shows from L to R....Red/Blu  Red/Gry  Brwn/Pink

If I'm looking at my connecter plugged in from L to R its opposite.. I have Brwn/Pink Red/Gry Red/Blu.

It is a used a car and evidence of peeps being in there already....I think. 

[JFP in PA]

17 hours ago, vza said:

My diagrams different unless I'm not understanding correctly. Ill post the one im looking at.Im troubleshooting wires #10 #12 and #17  from DME. I am seeing a fluctuating

5-8v on pin 12 with engine running. I see 12v on same pin with only key energized.  Im backprobing + wire on  multimeter to whatever pin on sensor plug im testing at the time(pin 10 or 12) and (-) going to common ground on engine block. I might add I saw 12v STILL on pin10 red/blue with the plug unplugged at the DME with key energized ..this led me to believe the power was coming from a different source other than DME(It was unplugged)

Maybe I'm on a completely incorrect diagram?

The diagram I posted is a simplistic one from the Porsche factory OBD II diagnostics manual.  The wire colors and pin numbering changed on different model years, but the principles were still the same: the sensor has three wires, one for power, one for signal to the DME, and one for ground.

 

Where did you get your diagram from?

[vza]

It's a 987.1 05-07 repair manual. Forgot where I got it from. It seems I made a major blunder at diagnosing. Looking at the flow chart more carefully the red/blue originates from fuse box so I'm assuming 12v it then passes thru 8 other sensors ending at mass air flow and cooling water valve on each side. Red/gry goes to DME labeled cam sensor im assuming that's the 5v ref no other sensors and the brwn/pink passes thru 4 sensors and is a shared ground. Again ...order of wires looks reversed at my plug. L to R I have brwn/pink red/gry and red/blu in diagram it's opposite meaning the ground and 12v are reversed. I'll look at the Bank 2 connector see what order it's in. Rechecked voltage 12v red/blu red/gry 55mv (shoud be 5v ref). Brwn/pink gnd. At DME voltage on red/gry is 55mv where it should be 5v ref. This was the same on bank 2 cam sen.ref wire BUT with engine running they are both 7v. Cam 2 ref wire according to flow chart is brwn/vio my wire was brwn(unless vio was no longer visible) This point I'm stumped. DME was rebuilt from Specialized ECU Doctor.Thanks v

Edited Saturday at 07:55 PM by vza