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Discussion Starter #1
Ok guys I guess I'm a lil confused? What is the difference between the constant controll relay module & the fuel pump driver module? Does my 00' gt have a relay for both of these? Is so where is it? Any help trouble shooting will be a great help to me for I am still having a fuel system problem? If you have any questions about the car feel free to ask and I will answer to the best of my knowledge, right now I'm still kinda stumped???
 

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The CCRM is an assembly containing four relays controlling the:

  • PCM power;
  • fuel pump main power;
  • ECT cooling fan low and high speed;
  • AC clutch;
The FPDM controls the voltage fed to the fuel pump, according to "commands" received from the PCM.

The PCM sends a 5% to 50% duty cycle to the fuel pump driver module which then powers the pump at 10% to 100% of full capacity. The FPDM returns a 50% d/c signal to the PCM to indicate all is well.

Signals from the PCM of 0% to 5%, 51% to 67.5%, or 82.5% to 100% are invalid, the FPDM will return a 25% d/c signal to the PCM.

A PCM signal of 67.5 to 82.5% command the fuel pump off, the FPDM will return a 50% d/c signal to the PCM.

More about how that works here.

Here are the wiring diagrams for the CCRM and the FPDM/pump.
 

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Discussion Starter #3
Thanks CliffyK! Now can you tell me where my CCRM is located because I get different answered from every where and body... Don't know where my Haynes is located @ the moment either?

---------- Post added at 12:29 PM ---------- Previous post was at 12:29 PM ----------

Mathew r Wright said:
Thanks CliffyK! Now can you tell me where my CCRM is located because I get different answered from every where and body... Don't know where my Haynes is located @ the moment either?
Please...
 

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passenger side, by the wheel well under the fender itself, you could possibley get to it from where there is an opening into the fender in the engine bay. where a cold air would go
 

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Discussion Starter #5
1996mustang said:
passenger side, by the wheel well under the fender itself, you could possibley get to it from where there is an opening into the fender in the engine bay. where a cold air would go
Thank you...
 

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