PCM Location and Removal - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 1 (permalink) Old 12-17-2005, 10:10 AM Thread Starter
4cstr
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PCM Location and Removal

Here is some information pertaining to the location and removal of the PCM for the 94-97 & the 99-03 7.3 PSD.

First 94-97

PCM INSTALLATION 94-97
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Before going any further,
**REMOVE KEY FROM IGNITION**

In the engine compartment, beneath the brake master cylinder, there is a wiring harness connected to the PCM. Make sure it is the single harness, closest to the fender well. Remove the 10mm bolt in the center of the harness, and pull away from the PCM. Remove the two (2) 10 mm bolts attaching the rubber boot to the firewall (on the top and on the bottom). Remove the boot.

On the drivers side fender, locate the two (2) 5/32” screws that hold in the plastic fenderwell in place (at about the 12 o’clock and 2 o’clock position) and remove them. You will need a long object to pry the fenderwell down. A prybar or broomstick works well. At about the 2 o’clock position, slip the prybar between the fender and the plastic fenderwell about 6” – 8”. Pull up on the prybar to “pop” the fenderwell down.

You should now be able to remove the PCM from the firewall. If the PCM will not come all the way out, try re-adjust the prybar position to gain proper clearance.
Reinsert the computer into the vehicle with the label on the PCM connector facing the fender. Reinstall rubber boot around PCM. Reconnect wiring harness in engine well to computer. Snug the 10mm bolt. Reattach fenderwell to fender.

Start engine and allow to idle and warm up.
If the check engine light stays on, the computer has gone into limp mode. Disconnect and re-clean the terminals.


99 to 03 models

Before going any further,
**REMOVE KEY FROM IGNITION**

In the engine compartment, beneath the brake master cylinder, there is a wiring harness connected to the PCM. Make sure it is the single harness, closest to the fender well. Remove the 10mm bolt in the center of the harness, and pull away from the PCM.

Locate the PCM inside truck. The PCM will be behind the emergency brake pedal, close to the drivers’ side, kick panel area.
Remove the top and bottom 7mm bolts holding the black plastic PCM housing. Remove the PCM and the black plastic housing from the drivers’ compartment. Note how the PCM fits into the housing for re-installation purposes. (In most cases there is an X on one side of the PCM, this X faces the fender.)

Place PCM in housing, and re-install housing onto the metal bracket.
Reconnect wiring harness in engine well to computer. Snug the 10mm bolt.
Start engine and allow to idle and warm up.

I get many calls a day asking about where to find the PCM. I have attached printable versions. I hope this helps.
Attached Files
File Type: pdf article1.pdf (86.6 KB, 1360 views)
File Type: pdf article2.pdf (81.2 KB, 1363 views)
File Type: pdf article3.pdf (93.6 KB, 1134 views)
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