5.5.2 99

I sent my DME/IMMOB/FOB to EcuDoctors -- they tested the setup and it worked fine.
I then had them modify the DME to be stand-alone.

My symptoms have not changed since I got it back. So as best I know the DME is fine and should be working in standalone mode.

So assuming the DME is working fine and the Immobilizer setup is happy -- what signals could prevent the DME from allowing the car to start?

I need to probe each one and see which is the cause?

I'm about this close to buying a second (cheap) Boxster just to have a known good unit to probe for signals on the DME.

thanks,

Mike

Hi Mike,

in general: if the engine turns over but doesn't start because you don't have ignitions sparks i would check the hall sensors, hall sensor connectors and hall sensor wiring first. Also the DME has an engine speed sensor. To translate that from Porsche workshop manual terms to normal terms check the crankshaft and camshaft position sensors, connectors and wirings.

If the DME doesn't know the exact position of the camshaft / crankshaft in general it would try to start in a limp mode, but maybe the 5.2 with the mods doesn't.

My car has the DME 7.8, so there might be differences. When i try to start the car without a transponder the engine doesn't turn over at all.

Regards, Markus

I'm a EE, so I understand what you are asking.

when I am jump starting -- it's to the battery terminals -- or to the battery terminal wires.
when I am bypassing the battery -- the battery is physically unconnected to the car.
I.e. I remove the connections and connect directly to the battery terminal wires.


mike

Solved "no start /no crank"
 

There is an electrical connector in a black plastic box in the engine compartment. I would call it a "ground" but I believe it is a positive terminal. When I turned the key and wiggled the cable the car started. I sprayed the connection/nut with a little battery cleaner, loosened/tightened the nut and the car works perfectly after eight months. Also I did have a warning sign in that the gas cap door would not lock consistently before it went completely "no start"". So now all is well...the little things...sigh ....