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PCM location

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,179 POSTS
THe EEC also controls the ingnition system. When this happens, do you hear the pump going on and off or could it be something like a crank sensor that is bad?
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Friday, November 23rd, 2018 AT 1:55 PM (Merged)
Tiny
DUSTER1450
  • MEMBER
  • 2 POSTS
  • 1991 FORD F-150
  • V8
  • 4WD
  • MANUAL
  • 114,000 MILES
Iv'e asked (5) different sources and have gotten (5) different answers to exactly where the PCM is located on this vehicle. Can someone please help?
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Friday, November 23rd, 2018 AT 1:56 PM (Merged)
Tiny
INDYUKE
  • MECHANIC
  • 416 POSTS
The PCM is located behind the drivers side kick panel just ahead of the door. Remove the door panel and the PCM will be a silver box approx 1.5" x 8" x 5" just below the level of the underside of the dash. The PCM fits into a slot in the firewall. If you open the hood and look down behind the driver's side wheel well, you will see the wiring harness that is bolted into the PCM through the slot in the firewall. Hope this helps.
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Friday, November 23rd, 2018 AT 1:56 PM (Merged)
Tiny
KENMORGAN
  • MEMBER
  • 1 POST
  • 1987 FORD F-150
  • 88,000 MILES
Where is the computer and how do you replace it?
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Friday, November 23rd, 2018 AT 1:56 PM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Under drivers side of dash.

Why are you replacing it.

Not a common failure

Roy
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Friday, November 23rd, 2018 AT 1:56 PM (Merged)
Tiny
MACE 59
  • MEMBER
  • 2 POSTS
  • 1984 FORD F-150
Engine Mechanical problem
1984 Ford F150 V8 Four Wheel Drive Automatic

please tell me exact location of eec computer & eec relay? Thank you mace59.
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Friday, November 23rd, 2018 AT 1:56 PM (Merged)
Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
Hello and thanks for donating

Your vehicle's EEC power relay is under the center of the instrument panel, near the ECA module. The ECA module itself is under the center of the instrument panel as well.
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Friday, November 23rd, 2018 AT 1:56 PM (Merged)
Tiny
ECUTLASS
  • MEMBER
  • 1 POST
  • 1990 FORD F-150
1990 Ford F150 V8 Two Wheel Drive Automatic

where is the pcm located in the truck? And what do it look like?
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Friday, November 23rd, 2018 AT 1:56 PM (Merged)
Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
Left side kick panel
its a metal box
look under the hood locate brake booster and to the right of in the firewall wiring harness
in the middle of it has a bolt, that's bolts to the control module and u have also two nuts holding the box on the firewall
good luck
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Friday, November 23rd, 2018 AT 1:56 PM (Merged)
Tiny
JWH532
  • MEMBER
  • 6 POSTS
  • FORD F-150
I have a 1197 ford f-150 xl 4.2 l where can I find the pcm?
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Friday, November 23rd, 2018 AT 1:56 PM (Merged)
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Try tucked up behind the glove box.
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Friday, November 23rd, 2018 AT 1:56 PM (Merged)
Tiny
JWH532
  • MEMBER
  • 6 POSTS
Thanks
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Friday, November 23rd, 2018 AT 1:56 PM (Merged)
Tiny
LMJLOANS
  • MEMBER
  • 1 POST
  • 1996 FORD F-150
  • V8
  • 2WD
  • AUTOMATIC
  • 72,000 MILES
I was told my problem was probably the computer and I took out the control module thinking it was the computer but have since replace it. Now I am trying to find out where and how to take out the computer to see if it is indeed the problem as to why my truck will not start. It appeaed originally that it might have been the fuel pump but according to the diagnostic it said it might be the 02 sensors we replaced two of the sensors but it did not cure the problem. I am being told my another expert that it is probably the computer and I have not been able to locate it. Can you help?
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Friday, November 23rd, 2018 AT 1:56 PM (Merged)
Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
Driver side firewall. Up under the dash. Its where you see that big wireloom attach to with a bolt in the center under the hood
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Friday, November 23rd, 2018 AT 1:56 PM (Merged)
Tiny
FANTUM48
  • MEMBER
  • 6 POSTS
  • 1997 FORD F-150
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 172,000 MILES
My truck is in a start/no run situation. I Rebuilt the 4.2L and have put 2000 good miles on it when it just bucked, coughed and stalled out last week. Checked the mechanics of the motor. Fine(timing, compression, all good). Fuel delivers a static 35psi to the rail and is being injected into the cylinders and there is spark. No code has been thrown out by the PCM. All sensors I have checked(TPS, IAC, IWT) are good. I am having issues finding out what voltage I should be seeing going into and out of the Cam Angle sensor and the Crank position sensor. The Cam angle is new from the rebuild. I am at my last resource here before I say its the PCM that quit. So some voltage knowledge and where to go from there would help me greatly. Thanks
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Friday, November 23rd, 2018 AT 1:56 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Hi fantum48,

Thank you for the donation.

You mentioned start/no run condition, does that mean it can be started?

The voltage of the CMP is less than 5 volt and with engine running, it should not vary more than 0.1 volt.

Crankshaft position sensor is Hall effect so it is 12 volts.
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Friday, November 23rd, 2018 AT 1:56 PM (Merged)
Tiny
FANTUM48
  • MEMBER
  • 6 POSTS
It cranks over only, sputters and coughs occasionally, but does not run. I have replaced the CMP and CKP. I am at a loss with it, can't figure it out and am very hesitant to get a new PCM. No codes to retrieve. Help!
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Friday, November 23rd, 2018 AT 1:56 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Since it is sparking with compression and fuel getting to the cylinders, it should be running.

When sparks are available, it is not likely to be a problem with the PCM, cam or crank position sensor.

Are the sparks bright blue or orange? If it is dull orange, the sparks could be weak resulting in the non starting. Were the spark plugs checked? Are they clean or sooty?
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Friday, November 23rd, 2018 AT 1:56 PM (Merged)
Tiny
FANTUM48
  • MEMBER
  • 6 POSTS
I have replaced the plugs. Then old ones did have carbon build up on them, but I figure that's part of the break in period for a rebuilt engine. The Coil pack primary side was around 700ohm, and the secondary side was around 13k ohms, which I think is just outside of spec. I have not actually looked at at the spark myself, so I dont know if its blue or orange.
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Friday, November 23rd, 2018 AT 1:56 PM (Merged)
Tiny
FANTUM48
  • MEMBER
  • 6 POSTS
In addition. The cam angle sensor(CMP) is seeing.6V under battery voltage, and the Crank Position Sensor(CKP) I cannot get a voltage reading either front or backprobing. These readings were taken key on engine off because of the no start condition
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Friday, November 23rd, 2018 AT 1:56 PM (Merged)

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