Jumping or Bypassing a Neutral safety switch on a tiptronic

[cornontherob]

My boxster currently won't crank. Key is turned, and fans shut off when it does, but the starter just doesn't crank. I think I have it narrowed down to either the immobilizer or the nss. How would I go about bypassing the switch? The car's battery is fully charged, the starter does work when a direct current. Any ideas? 

[JFP in PA]

 

The neutral safety function is part of the multifunction switch on the side of the Tip.

[cornontherob]

Yes but as for bypassing it, I don't know for sure if that's what it is, so if it starts when I jump it, I'll replace it.

[Ahsai]

Have you tried putting it in neutral first? http://www.renntech.org/forums/topic/21498-engine-wont-start-until-i-do-the-trick/

[JFP in PA]

Yes but as for bypassing it, I don't know for sure if that's what it is, so if it starts when I jump it, I'll replace it.

 

I would suggest obtaining a wiring diagram for the vehicle, and check the multi switch circuits to see which ones need to be jumpered.  I believe the Bentley manual for the 986 has the diagrams.

[Loren]

The Tiptronic is microprocessor controlled so there is not "two wires" combination for neutral.

You possibly could switch the correct two solenoids for neutral and the correct EPCV signal but you risk blowing the Tiptronic control unit.

 

IMHO -- If you really think it is that switch then get a used one from a salvage yard and try it. At least you do not risk blowing up a very expensive control module.

[cornontherob]

After putting the car in neutral and jiggling it around everywhere, still no crank. I took apart immobilizer and no corrosion or any signs of failure. Fuse on the box was fine.

[Loren]

Sorry, but you are just guessing - and that an get expensive very quickly.

You need to put a Porsche diagnostic tool on the car.

[cornontherob]

Will a porsche diagnostic tool adequately diagnose either problem? Will the car even throw a code for a faulty nss? 

[JFP in PA]

Will a porsche diagnostic tool adequately diagnose either problem? Will the car even throw a code for a faulty nss? 

 

A Porsche specific tool can scan the Tip controller and tell you what it sees, which an OBD II scanner cannot.  I am unaware of a specific code for the neutral safety settings, but there one for "lever position not defined", P0706, which may be the one.