soan

anyone can let me know how to fix? when i replace the battery ,i forgot to turn off the ignition key.After i replaced i try to start but engine no crank no sound no nth. help

No HTwo O

Is your polarity correct?

Maybe disconnect. And re-do correctly.

jsmirand

disconnect, scrub the contacts, make sure they are clean, re-tighten. I once had this problem (with an older car), contact appeared generally clean, but wasn't.

soan

everything is done. i suspect ecu is lock. coz when i take off the battery, ignition switch is on. is it possible?

Edgy01

You need to call your dealer.

Macster

I agree with Dan.

There's a caution about having the key on and disconnecting the battery and I believe in doing this you damaged the engine controller.

I hope I'm wrong, though.

But if you disconnected the battery for a while and this time with the key off and removed from the switch re-connected the battery correctly and the engine doesn't start...

You're going to have to take it to a dealer, or some shop, that has the computer and know-how to diagnosis this.

Before you do so though if you're up to it, check the fuses. Maybe a DME fuse blew? Be careful you don't static discharge into anything in the fuse box and be sure you note where you remove a fuse and don't over spec a fuse, etc.

Sincerely,

Macster.

McCulla

HA HA!! Purposeful, right?

Edgy01

Perhaps!

jhbrennan

The skeptic in me worries that someone is trying to find out how to start someone else's car.

soan

i think should re set the immobilize. any idea?

jhbrennan

If it's the transponder chip in the key, I think only the dealer can reprogram that.

gpjli2

Call police maybe? (Too cynical?)

Macster

There is no reset of the security system. The security system resets automatically every time the key is inserted in the ignition and the key turned to the on position. This repowers the security system and it is a power on reset.

Only a shop with the proper Porsche diagnostics computer and know-how can diagnose the no-start condition that arose after the battery connect mixup.

The DME (engine controller) may have been damaged, or the security system (the electroncs) may have been damaged.

Also, anytime there is any futzing about with the car's security controller the factory requires proof of ownership before it will send over the security acess codes to the dealer to enable the dealer and its tech to access the car's security system.

Sincerely,

Macster.