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Pinout 3 4 pcm

Pin outs

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Posted on Jan 02, 2017

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SOURCE: code 12 1995 dodge spirit 2.5 battery and PCM NOT disconnected. where does the pin 3 on PCM gets its battery suppy voltage from

Has the battery been disconnected or been low on charge in the last 50 ignition cycles?

Code 12 means that battery power has been disconnected within the last 50 ignition cycles. it does not mean there is no battery power to the computer

Pin 3 should be a red/white wire that is the constat power supply to the PCM. It is protected by a fusible link located neer the drivers side strut tower. If that link was bad the car would not start or run as it also supplieds power to the asd relay, fuel pump relay, and the ssd relay.

I would put money on the the problem being igntion (plugs wires cap rotor), compression (low cylinder compression usually cylinders 2 and 3), lack of fuel delivery (low fuel pressure, a weak or dirty injector), timin (timing belt jumped, worn distributor, look exciter ring), or possibly a plugged catalytic converter.

I would check compression first especially cylinders 2 and 3. It was pretty common for the head gasket to fail in between these two cylinders.

Posted on Feb 24, 2012

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SOURCE: pinout for 05 F150 5.4

Here are the pin out diagram for Ford OBD2 PCM


Or go to this link

Posted on Aug 24, 2012

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go to ford and look up the computer the part #will be there but also search on ebay for the electrical diagrams manual and the pin out is in there I have a couple of books but not yours but there great to have on hand for testing thats the best I can do for you if you had a 4.6 our a 3.0 you would've scored but the info I just gave you should put one in your hands in 1 week good luck Stephen

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What is the pinout and color code for a 2002 Buick century pcm

are you looking for certain pin-outs for a particular circuit and if so which one/s.

Jul 28, 2015 | 2002 Buick Century

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Where can I get a pcm pinout

Most mechanics get that from dealer mechanic on his computer. I have gotten them several times over the years and it costs nothing.

May 23, 2014 | 1998 Chevrolet Venture

1 Answer

97 jeep grand cherokee ECM pinout

its 2 places.
The FSM (a book by that name from Jeep, by year,model)
Just the connector, the schematics dont show all pins and names.
only by function, say you have bad TPS input and you got TPS page
and see pins and colors on PCM.
the connector is in the book.
at the end of chapter 8w, page 80 are all connectors and page one is the index there. listing page 8w-28,29,30 for the 3 PCM conn.
see them here, in WIRING.
PDF page 178.
see it?

on ZJ section

posted 100s of times now.
but the search on this site , fixya sux

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1 Answer

The dodge dealership said we needed a pcm, so we replaced it. Now, the transmission wont shift out of low gear. The pcm has 3 missing pins. Will this effect the transmission? I'm thinking we need to get a...

did the original pcm have thee missing pin, they may not be missing they may be left out in engineering, as far as the trans not shifting, was the pcm reprogramed because if you just installed out of a box it unlikly that it will shift

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Pinout for 05 F150 5.4

Here are the pin out diagram for Ford OBD2 PCM


Or go to this link

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1 Answer

The 8 pin connector to the cluster got accidentally dismantled and all the 7 wires in the sockets popped out. I do not how to put them back as the wires do not have numbers corresponding to the plug.


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8 pins diagnostic.

There are also several 8 pin connectors used in Mercedes radio and CD. Here the pinouts.

Regarding the connector at the back of the dash, to find pinout I will need year and model of the car.

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