Shorted PCM

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effutu

Member - Posts: 8

Joined: October 30, 2005

Location: United States

Posted: January 06, 2006 at 4:23 PM / IP Logged

If 12v are sent through an immobilizer via the wire connected to the transponder ring, can it short a PCM? (PCM is obviously 5v) Can one determine if a PCM has been shorted without using a breakout box? My vehicle is a 1999 Mazda 626 ES. The pcm is a Ford EEC V.

ziggyb222

Silver - Posts: 593

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Joined: January 04, 2004

Location: Maine, United States

Posted: January 06, 2006 at 9:10 PM / IP Logged

One sure way is to see when the key is turned on if you get a check engine light. If no light comes on then the computer is not running through its check.. so Probably it is fried...

03sd

Member - Posts: 16

Joined: December 06, 2005

Location: United States

Posted: January 06, 2006 at 9:14 PM / IP Logged

Do you have a specific problem?

Bob O.

effutu

Member - Posts: 8

Joined: October 30, 2005

Location: United States

Posted: January 18, 2006 at 11:05 PM / IP Logged

Does anyone else have any insights?

ziggyb222

Silver - Posts: 593

Joined: January 04, 2004

Location: Maine, United States

Posted: January 19, 2006 at 6:46 AM / IP Logged

You never stated if you checked the check engine light. Do you see that light when you turn the ignition switch to the on position???

effutu

Member - Posts: 8

Joined: October 30, 2005

Location: United States

Posted: February 01, 2006 at 3:56 PM / IP Logged

I checked the check engine light and it did come on while the ignition was switched to the on position. Does this mean that the pcm is in fact working? If so how does one unlock the pcm if it has been locked from starting without a working immobilizer?

joe_1

Silver - Posts: 286

Joined: November 12, 2004

Location: United Kingdom

Posted: February 01, 2006 at 4:21 PM / IP Logged

if you sent 12v through the transponder ring wires you have most prob shorted a circuit, however the engine management side of things can still work, its just the immob circuit you have blown, what does it immob starter or fuel?

i am also a technician so if you have any engine trouble let me know, and i will do my best to help.

effutu

Member - Posts: 8

Joined: October 30, 2005

Location: United States

Posted: February 01, 2006 at 7:30 PM / IP Logged

fuel

joe_1

Silver - Posts: 286

Joined: November 12, 2004

Location: United Kingdom

Posted: February 02, 2006 at 4:13 PM / IP Logged

have you tried bridging the fuel pump relay terminals pin 30 and 87 this will run the pump, and then if you crank the car it should start

i am also a technician so if you have any engine trouble let me know, and i will do my best to help.

effutu

Member - Posts: 8

Joined: October 30, 2005

Location: United States

Posted: February 25, 2006 at 4:27 PM / IP Logged

Exactly what do you mean by "bridging"? Do yo mean just connecting a wire to those pins, 30 and 87? Is any damage possible by doing this process?

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