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Pinout 3 4 pcm

Pin outs

Posted by Anonymous on

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

airjer995
  • 5332 Answers

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

emissionwiz
  • 75005 Answers

SOURCE: pinout for 05 F150 5.4

Here are the pin out diagram for Ford OBD2 PCM
8_24_2012_3_43_36_pm.jpg

8_24_2012_3_43_57_pm.jpg

Or go to this link

Posted on Aug 24, 2012

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I have a 2002 Jeep Grand Cherokee 4.7, I have 3 different ECM's and they all are having the same issue. I am not getting ground from the ECM to the Map sensor.


on most PCMs the PCM passes ground (input to PCM) out to the sensors. so if that ground is bad all are.
this is done on purpose, so the PCM can measure ground errors
and adjust sensor readings accordingly.
now Ill look yours up. since you stated its a 4.7L , most poster here
have not a clue to what is under hood.
my guess is the map is reading wrong?????????????
HINT1: when measuring ground attach your DMM to the battery minus
post and it will read 0 to 0.5v max for ground.
what did you read, as you said its not GETTING ground.
so what was the reading? 12v?
i take it you work with FSM/s and its schematics.
see chapter 8w-30 (wiring , Fuel-------) page 16-18
http://www.jeep4x4center.com/knowledge-base/index.htm?utm_source=cj#service

see that page.? page 17 is best.
see the 3 pins?
PCM pin 4 is ground to MAP pin 1. 0volts
PCM pin 17 is 5vdc power supply to Map and most be 5v (+- .25v)
PCM pin 27 is map out sig to PCM, (baro measurements)


the PCM master grounds (input)
are C1 pin 31 and 32.
they must read 0v to battery minus. KEY ON. or running.

page 8w30-6 see that.

wish i had the full symptoms. , no start, runs bad. what?






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1 Answer

97 jeep grand cherokee ECM pinout


its 2 places.
The FSM (a book by that name from Jeep, by year,model)
and Alldata.com
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.
there.
see it?
http://www.jedi.com/obiwan/jeep/misc/models.html

on ZJ section

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

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1 Answer

Pinout for 05 F150 5.4


Here are the pin out diagram for Ford OBD2 PCM
8_24_2012_3_43_36_pm.jpg

8_24_2012_3_43_57_pm.jpg

Or go to this link

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1 Answer

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Hi.

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

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