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Old 11-29-2012, 01:28 AM   #1
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Confused/need understanding?

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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Old 11-29-2012, 10:59 AM   #2
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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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Old 11-29-2012, 12:29 PM   #3
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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 ----------

Quote:
Originally Posted by Mathew r Wright
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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Old 11-29-2012, 04:41 PM   #4
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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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Old 11-29-2012, 05:46 PM   #5
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Quote:
Originally Posted by 1996mustang
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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Old 11-29-2012, 07:02 PM   #6
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Ok so I've herd now that you can take these CCRM's apart and replace the relays in them is this true???
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Old 11-30-2012, 07:28 AM   #7
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Quote:
Originally Posted by Mathew r Wright View Post
Ok so I've herd now that you can take these CCRM's apart and replace the relays in them is this true???
It may be, however as you can buy a "remanufactured" one for $65 why bother to do it yourself...
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New ride (7/1/2013) 1998 Mercedes SL500-5.0L 32V VVT 326/347 HP/tq
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Old 11-30-2012, 04:07 PM   #8
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Quote:
Originally Posted by cliffyk

It may be, however as you can buy a "remanufactured" one for $65 why bother to do it yourself...
Oh just trying to be a tightwad you know...
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