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EEC power relay coil location

Tiny
TICUPOLU
  • MEMBER
  • 1996 FORD MUSTANG
  • 3.8L
  • 6 CYL
  • 2WD
  • MANUAL
  • 280,000 MILES
Hi all! I am having problems with fuel pump receiving two volts when the key is off and ten volts when I turn the key on. It is draining my battery. When I try to scan OBD it tells me that the switch is not on and cannot communicate with EEC. I would like to change EEC power relay coil before changing EEC, but I just cannot find it. I cannot find any information or pictures on where it is located. Can anybody help with that please?
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Sunday, April 22nd, 2018 AT 12:50 PM

15 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
That relay is built into the CCRM (Constant Control Relay Module). It is located behind the fender well on the passenger side.
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Sunday, April 22nd, 2018 AT 1:27 PM
Tiny
TICUPOLU
  • MEMBER
  • 9 POSTS
Thank you for quick respond. In my troubleshooting I unplugged CCRM but still get the two volts to fuel pump with key switch at off. When I pull out the EEC 20 amp fuse I do not get that two volts draw. Do you think I should buy a new ECC or is there a way to test it?
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Sunday, April 22nd, 2018 AT 1:45 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Power goes directly from the CCRM, through the Inertia switch to the fuel pump so if you are seeing voltage on that line with the CCRM disconnected, then that wire has to be picking up voltage somewhere. Disconnect the Inertia switch and the CCRM and see which side of the Inertia switch plug you find voltage.
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Sunday, April 22nd, 2018 AT 1:55 PM
Tiny
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  • 9 POSTS
I get two volts on green/yellow wire on both side, inertia and CCRM.
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Sunday, April 22nd, 2018 AT 1:59 PM
Tiny
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Okay, that wire branches off to the PCM so the PCM knows when the pump is active. I would locate an accessible spot close the the CCRM and cut that wire, then see what happens to the voltage.
If nothing changes, unplug the PCM.
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Sunday, April 22nd, 2018 AT 2:03 PM
Tiny
TICUPOLU
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  • 9 POSTS
The green/yellows gives our two volts to the inertia even if the CCRM is disconnected? I guess it is a short somewhere in between. I do not really need to cut the wire?
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Sunday, April 22nd, 2018 AT 2:12 PM
Tiny
WRENCHTECH
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So, I guess you already know whether the PCM is causing or not it because that wire also goes there.
Or whether the CCRM plug is shorted.
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Sunday, April 22nd, 2018 AT 2:16 PM
Tiny
TICUPOLU
  • MEMBER
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Okay, PCM is inside CCRM. Thank you for good information, now I know it is a short better than changing EEC.
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Sunday, April 22nd, 2018 AT 2:19 PM
Tiny
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No, the PCM is not inside the CCRM. The PCM is the main engine control module.
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Sunday, April 22nd, 2018 AT 2:21 PM
Tiny
TICUPOLU
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  • 9 POSTS
PCM relay is inside the CCRM. I did what you said and cut the green/yellow wire close to the CCRM but still get two volts at CCRM.
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Sunday, April 22nd, 2018 AT 2:36 PM
Tiny
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Sorry at inertia.
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Sunday, April 22nd, 2018 AT 2:37 PM
Tiny
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Okay, reconnect the wire and totally unplug the engine control module.
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Sunday, April 22nd, 2018 AT 2:41 PM
Tiny
TICUPOLU
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No more two volts on inertia with EEC disconnected.
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Sunday, April 22nd, 2018 AT 2:53 PM
Tiny
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Sounds like the engine control module is the problem.
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Sunday, April 22nd, 2018 AT 2:55 PM
Tiny
TICUPOLU
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Anyway to fix that without changing the EEC?
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Sunday, April 22nd, 2018 AT 2:57 PM

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