CCRM, EGR, etc deletes

Discussion in 'Gen 1 & 2 - Electronics & Audio' started by Rennfab, Sep 8, 2019.

  1. Rennfab

    Rennfab New Member

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    Good day folks. I am in the process of rewiring the Shogun right now. Initial I had planned to put in a new painless chassis harness, coupled with a Holley EFI Pro ems to run the drivetrain. That plan is still going to happen, however for the time being to get the car back up and running for other misc work I am going to rebuild the OEM engine harness and work it back into the car so that it can be easily swapped out later next year with little fuss. I am going to use a pair of millspec bulkhead connectors to feed the necessary wiring between the chassis harness and the engine harness, much like the Porsche 911's do

    That being said, what I want to do is eliminate any possibly sub systems in the harness that I technically do not need. When this car was built in 1990, they essentially took the entire harness and did a rear transplant more or less, and it is laid out much as it was in the SHO taurus engine bay.

    One, the car has no emissions compliance here in this state due to its age. No cats, etc. Can the EGR be deleted without any negative performance aspects? I can machine blockoff plates and any hardware needed, and do not care if there is a system CEL/code as there is no CEL in the dash. I know some manufactures incorporated "limp mode" type garbage with some EGR systems and just wanted to make sure that there was none of that with this car.

    Two, the CCRM. I know this controls the fuel pump and fan(s)/ fan speed on various SHO Taurus models. On this car, the new radiator fans and fuel pumps are now controlled on their own independent circuits, completely isolated from any PCM control. With that in mind, can the CCRM also be deleted without any ill effect or does it control other subsystems in the factory PCM(ignition mainly) that would otherwise prevent the engine from running if bypassed and removed?


    Mind you I am not a "newb" when it comes to automotive electrical systems. Have performed many engine transplants in my life that required weeding harnesses. I just figured I'd ask the veteran SHO meddlers before diving in with nips and a soldering iron :)


    Greatly appreciate all the help thusfar and putting up with my questions. The Shogun mechanical resto is moving along nicely and I hope to have it back up and running for next spring at this rate.
     
  2. blk\blk90

    blk\blk90 SHO Member Supporting Member

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    I know doing an egr delete is possible. Either block off plates or non egr manifold/intake and non CA ECU, so I dont see why it wouldnt work. If your new EFI system has the capability to run fans and a fuel pump, which I'm guessing it does, then it should be fine. I think either @NoSlo or @BaySHO Performance has the ccrm layout or pinout. I believe you can eliminate the crank sensor input too and just run timing off the cam sensor.
     
  3. Rennfab

    Rennfab New Member

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    Appreciate the info. I did come across a thread with a CCRM pinout after I posted this. I also purchased a set of good condition factory SHO manuals off Ebay that I wanted to browse through they just have not arrived yet.

    The original wiring on the car had the fan and the fuel pump controlled just as it would be in the Taurus(via the CCRM). On the new harness I have worked into the chassis, the radiator fan is on it's own separate circuit with a programmable fan controller(Dakota Digital), as is the fuel pump. This was done this way as when I change to the Holley EMS, the subsystems and related wiring can stay in the car and cleanly integrate into the Holley flying lead harness. So to me, the CCRM in this car is now redundant and unecessary. Deleting it and any related wiring would clean up the harness a bit.

    There is also a large, U shaped white resistor in this system. Looks like an older pump voltage step resistor(two speed fuel pump) but not 100% sure on it. Hoping that the factory manuals I bought will have the wiring schematics I am looking for to answer alot of these questions.
     
  4. blk\blk90

    blk\blk90 SHO Member Supporting Member

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    If it has the wiring from the 90as well, I have a FSM for a 91 and can look things up if need be. Dont know how accurate it'll be but it may help.
     
  5. rubydist

    rubydist SHO Master Staff Member Super Moderators

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    The original 2 speed cooling fan used a large resistor like you described to cut the voltage to the fan motor for low speed. That may be what you see still in the wiring harness.

    To get the wiring diagrams, you will need the wiring diagram manual - that is a separate piece from the service manuals in this era.

    As I understand your description above, you will be able to delete the ccrm.
     
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  6. Rennfab

    Rennfab New Member

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    Funny reading this now, as the '89 factory manuals arrived today and as I am sitting here sifting through the two books I found that you were indeed correct. Not much for diagrams. Misc subsystems, but no major harness layouts.

    Soooooo, I just bought another auction of factory '89 manuals that showed and listed the smaller wiring diagram manual in the set that you had mentioned. It even showed an open picture of said manual that showed the page title for "EEC.... 3.0 SHO Engine". This will be my 3rd set of sourced factory manuals I have purchased in the past month. First set arrived destroyed, second set here now. 3rd set TBD, lol

    I'll keep you guys posted. thanks for the help
     
  7. Rennfab

    Rennfab New Member

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    I believe I bought the correct factory manual this time(tonight) that Ruby mentioned. Should have the SHO diagrams in it I need but if it turns out incorrect(or doesn't arrive) I will most likely take you up on the offer and def compensate you for your time/effort :)

    Thanks!
     
  8. sperold

    sperold Last to Know Supporting Member

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    The manual you want is the Electrical and Vacuum Troubleshooting Manual (EVTM) for the year of your Taurus transplant.
    They are usually around $15.00 on E-Bay and you will probably have to monitor the site a few weeks for one to come up.
     
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  9. FastCAD

    FastCAD Member

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    Are you using air conditioning? The PCM needs a signal that the fan(s) are running to activate the recycle switch.
     
  10. rubydist

    rubydist SHO Master Staff Member Super Moderators

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    The document you want is the actual wiring diagrams. If you search ebay for "1990 taurus wiring diagram" you will find (currently) several of the actual factory wiring diagram documents for sale. These are roughly 11" x 17" documents that fold out to around 17" x 34" with the detailed wiring diagrams on them.
     
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  11. Rennfab

    Rennfab New Member

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    Ok good because that is exactly the book that was included with this other set of manuals i just ordered.
     
  12. Rennfab

    Rennfab New Member

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    The AC system in the car is a bit of a hybrid, combination of the Festiva and Taurus components. It does work as intended, and the only SHO components in the system are the compressor and part of the hardline sections that bolt to the compressor itself. REst is either custom bits or Festiva parts/HVAC so the AC system currently doesn't tie into the CCRM wiring at all.
     

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