View Full Version : Oops. My car won't start

Unkie Barrels
03-18-09, 04:57 PM
I installed my new W4M PCM but forgot to unplug the battery. Now my car won't start. I unplugged the battery and tried again. Still nothing.

Any clues?

03-18-09, 04:59 PM
Battery's dead?

03-18-09, 05:00 PM
could have fried the ECM...I've seen it before.

03-18-09, 05:04 PM
Hmmm.... Getting electrical power? Is it cranking?

I've done the swap many times with the battery plugged in without issues.

Could be:

a) Bad W4M PCM - swap back to your original, disconnect battery for 30 mins and try again
b) Bad battery - coincidences happen

Unkie Barrels
03-18-09, 05:07 PM
The radio and lights turn on, but nothing happens when I turn the key the rest of the way to start the engine.

I didn't leave the battery unhooked for very long. How long does it take?

03-18-09, 05:21 PM
If the PCM was dead it would try to crank but just never fire. Are you saying that you don't getting anything from turning the key to the crank position?

03-18-09, 06:19 PM
leave the key on for 5-10 mins and make sure the "service theft system" doesn't show up on NAV. The theft system can turn your car into a brick.... have power... but no cranking.

You can short out the starter to see if it turns ( but it will not fire ) that will help you narrow it down.... I wanna say it was a thicker purple wire, but I'd have to check for sure (aka don't go shorting it just on me... verify 1st)

03-18-09, 06:24 PM
Try your stock PCM. When I fried mine, car would not crank. Got lights, but she was dead.

03-18-09, 06:27 PM
got too excited to install ? :banghead:

03-18-09, 09:19 PM
Swap back the PCM. To be absolutely sure leave the battery disconnected for 30 mins. But yes service theft (engine immobilizer) does sound like another culprit.

03-18-09, 09:29 PM
You are stepping on the clutch right?


but if it was a battery issue i think the car would try to tick over, unless you really drained it.