Foxbody eec relay location It is the relay that powers the ECM, injectors, EEC controlled actuators, the FP relay, etc. Foxbody Diagnostic connector Sep 9, 2022 · LMR's quick location guide will help you find exactly where your Fox Body Mustang fuel pump relay locations are depending on your specific year model. Nov 13, 1999 · The ECU relay ground wire is the blk/wht wire that runs to the funky looking connector that ties into the negative battery cable. ) Failed fuel pump E. May 11, 2008 · my FP relay is under the drivers seat and my MAF/o2 relay is near the passenger side shock tower. It powers the ecm,fuel pump relay,injectors,solenoids & actuators. It integrates with other ground wires along the path all leading to the funky connector. Feb 19, 2010 · I have a 1988 Ford Mustang 5. Our cars use EEC-IV. It is good to know that depending on the year, the fuel pump relay will be located in Mar 2, 2017 · Learn how to find trouble codes on your fox Mustang from 1986 to 1993. Mar 10, 2000 · @GoldenFox89 Fuel Pump Troubleshooting for 87-90 Mustangs Revised 1-Dec-2015 to add fuse links diagram. A late build 92 had both the pump relay and WOT relay under the MAF. May 27, 2005 · I have a 1990 LX 5. Aug 11, 2007 · I jumped the Relay and the pump ran. Aug 24, 2018 · JFYI - When the key is turned to the run position,the eec relay is energized and it sends power to the computer,fuel pump relay,injectors,solenoids and actuators,so if these items fail to power up when the key is turned on,the eec relay or one of its wires is the first place to start your trouble shooting. 0 because he swears it's gotta be in a different location than my 92' Notch - does that make sense? Jan 10, 2008 · EEC relay is behind the passenger side (RH) kick panel. Jul 22, 2011 · D. 0 Notchback! I swap the wiring,ecu,and mass air meter, from a 93 Ford Mustang! :winks My problem is that eec relay gets really hot and plug is melted! Ive change the eec relay and the fp relay but no changes it still gets really hot! Ive clean all grounds and they Hey guys pints and pistons here with a video on changing a multifunction relay on a 1986 mustang GT. Cranks OK, but No Start Checklist for Fuel Injected Mustangs Revised 18-Oct-2006 to include TFI fault during crank/run cycle All text applies to all models unless stated otherwise. That's for a quick fix. It turns the fuel pump relay on or off under computer control. Jul 4, 2020 · I have a 1993 fox body 5. Oct 2, 2015 · So what’s a Fox-body owner to do when the Check Engine light comes on or stays on while driving around? Check for trouble codes of course. Revised 24-Mar-2017 to add text about the A/C Wide Open Throttle Replace your defective PCM power relay in your Fox with a 1986-1993 Mustang factory-style PCM power relay! Sep 26, 2016 · Since the eec relay is responsible for energizing the ecm,fuel injectors,solenoids & the fuel pump relay, you should definitely test it. 0. Electronic Control Assembly), but also supplies power to the fuel injectors, the fuel pump relay, and a few other emissions related solenoids. The EECIV in fox Mustangs isn't all the complex. Note: 94-95 Mar 1, 2006 · There is nothing exactly called "eec relay" in our cars. *CLUE*- if your car has 2 relays near the maf sensor,instead of 1,youve got the later 92 model. Nov 13, 1999 · 86-93 models only: EEC relay next to computer - look for 12 volts at the fuel injector red wires. If I jump it manually the car runs and the Jul 29, 2014 · The control path consists of the computer, and the fuel pump relay coil. Where is it located under the dash on a 1990 GT 5. Look for 12 volts at the fuel injector red wires. I’ve been having a no start issue and I’m pretty positive it’s my eec relay cause I’ve got no power to my inertia switch, pump and pump relay. Nov 13, 1999 · B. Jun 24, 2004 · Sounds like the EEC relay alright. It is next to the A/C WOT cutoff relay. 9L, 5. This wire is also present in the diagnostic connector - it allows you to manually ground the wire so that you can trigger the fuel pump relay to run the pump without the EEC. Part 1 -How to Test the Ford Fuel Pump Relay (Green Relay) Part 1 -Testing the Ford EEC Power Relay (Brown Relay) Fuse box diagram (fuse layout), location and assignment of fuses Ford Mustang (1987, 1988, 1989, 1990, 1991, 1992, 1993). Nov 19, 2006 · The EEC relay is located on top of the computer. C. Apr 15, 2012 · The EEC Power Relay not only supplies battery voltage to the fuel injection computer (also known as the E. 94-95 models only: EEC or PCM power relay in the constant control relay module. ) Clogged fuel filter D. Its located above the ecm. Mar 31, 2025 · Often we hear of the difficulties in finding fuse panel diagrams for Fox Body Mustangs so we at LMR have provided a full list to better help you! Fusible links fried. any ideas? Mar 12, 2007 · i am coming down to the end of my 5. – KOEO- Fuel pump monitor circuit shows no power - Fuel pump relay or battery power feed was open - Power / Fuel Pump Circuits. Those controls are housed in the PCM (Powertrain Control Module) which is the car's main computer. Post your comments below!Thanks For Watching!For Merch head over to our store o Jul 18, 2007 · Hi just bought a 1988 mustang lx 5. I'm having issues with my fog lights not working and thi Mar 10, 2000 · The electrical circuit for the fuel pump has two paths, a control path and a power path. The EEC gets its power through a fusible link attached at the starter solenoid. The switched power (red wire) from the ECC relay goes to the inertia switch (red/black wire) then from the inertia switch to the relay Jul 10, 2025 · This tutorial will show you how to test the continuity of all four circuits that connect the EEC Power Relay to the PCM, ignition switch, battery, and Ground. If youre Mustang is an early 92 model,the fp relay will be located under the driver seat. It should run for 1-3 seconds and shut off. ) Blown fuse link in wiring harness. The EEC Power Relay is easy to recognize because it's usually a brown color. It controls power to the computer. the motor and engine harness are out of a 89gt with a t5 transmission, the eec is an A9L. Clue – listen for the fuel pump to prime when you first turn the ignition switch on. I'd highly recommend getting an origianl Ford relay, though, as GP Sorensen relays are total garbage (especially their 100% worthless crap fuel pump relays). The fuel pump relay on a 92 harness is located under the mass air adapter. EEC stands for Electronic Engine Control, which is the version of computer controls that a particular Ford uses to control the engine and the transmission. Is the relay clicking? When you say fuel sensor under the hood, i assume you mean the fuel pump relay. 3L is in the Intergraded Relay Control Module (IRCM) 1) FUEL PUMP RELAY 2) EEC POWER RELAY 3) ELECTRIC FAN RELAY 4) WOT A/C RELAY I have a similar problem. ) No EEC or computer power - EEC or computer relay failure 86-93 models only: EEC relay next to computer - look for 12 volts at the fuel injector red wires. 0l rx7 swap and need to get a bit of help with the wiring. These step-by-step tests apply to 1985–1991 4. Does anyone know where the PCM relay is located in this vehicle? I checked the passenger side kick panel but no luck Sep 8, 2015 · The EEC starts the fuel pump by providing a ground to the fuel pump relay. sorry i cant find the paper that i wrote the wire colours on but i I show you how to diagnose a relay and the basic principals of how it works. I do have power at both ends of inertia switch. Foxbody EEC problem fixed. Code 96 causes & tests 91-93 models. Sep 11, 2004 · The fuel pump relay cutting out is more than likely a result of the EEC losing power, not vise-versa. Please read this link: A big issue that many Fox Body Mustang owners have is finding their Fox Body fuel pump relay location. Be sure to closely check the condition of the relay, wiring & socket for corrosion and damage. 0 and where can I find the EEC Relay? Also does anyone know if this relay causes the Fuel Pump Relay to work? Feb 24, 2010 · Ok kinda knew to wiring on foxbody's but on a 1989 gt where is the eec relay located? Mar 23, 2017 · The relay on the left is the real fuel pump relay. I tested for 12V at the Red/LtGreen wire coming in to the EEC Relay - which I believe is the wire that provides the trigger for the relay to close - turned the key and I got power. 8L F-Series trucks —and they use nothing more than a digital multimeter and a little patience. ) Coil E. The computer provides the ground path to complete the circuit. I’ve checked and and with the fuel pump relay jumped I have 35ish pounds of pressure at fuel pump rail, but still doesn’t start due to EEC relay bugging out I believe. You will have to check the wiring. Removing the dash speaker helps access the relay sometimes. firstly, i dont know what relay this is. my car is a 91 and am wanting to find these two relays to make sure all is good wiring wise. E. . Oct 20, 2011 · 3 Posts Reaction score 0 Location Altoona #12 · Sep 10, 2013 There are saying the EEC Relay for 93 Mustang 2. So a bad eec relay will cause all of these components to not function. Mar 24, 2017 · The fuel pump relay is located on the front side of the passenger strut tower,near the maf sensor,on late 92 & all 93 Mustangs. 0L, and 5. Control Path The control path consists of the inertia switch, the computer, and the fuel pump relay coil. MrIlovebmw86 Oct 26, 2015 · If so, the EEC power relay is energizing. If you have an Advance Auto or Autozone where you're at go to it and buy the GP Sorensen part # MR14 for the EEC power relay. There are two relays there on a late 92 model,the fuel pump relay & the ac wot cutoff . The switched power (red wire) from the ECC relay goes to the relay coil and then from the relay coil to the computer (light blue\orange wire). These tests will help you pinpoint common problems like blown fusible links Jan 1, 2011 · Where is the fusible link located between the ignition switch and the eec power relay? I see one on the wiring diagram but where is it located in the car? Im trying to fix a no-start issue and narrowed it down to the power wire the triggers the relay. Because it ran, I can say that the circuit is fine from the EEC Relay, thru the Inertia Switch, thru the FP Relay and to the pump. I’ve seen a lot of people say it’s on the passenger side kick panel below the computer but it seems to be somewhere else. The IRCM is located on the passenger side front shock tower. Mar 10, 2000 · So my brother is trying to find his EEC power relay for the fuel pump. my papers and info i printed off say there is an ignition relay and EEC power relay. The other one is mismarked or the wrong part number. Does anyone know where else it could be and how I could get to it and replace it? Mar 14, 2008 · You can test for the ground pulse from the EEC to the control side of the relay, and then ground that same wire at the EEC test connector to help with diagnostics. To trick the fuel pump into running, find the ECC test connector and jump the connector in the upper LH corner to ground. Also review what all the 2 and 3 digit codes are about. ) Fuel pump power relay – located under the driver’s seat in most Mustangs built before 92. If you dont hear anything, the EEC relay is not getting power. Click to expand With the fuel pump relay plugged back in the EEC clicks as it should with the key turned to on but no click at fuel pump relay. the car is at a shop now. The fuel pump circuit lost power at one time or another. See the diagram to help identify the fuel pump relay wiring colors. Jan 17, 2011 · so ive been having trouble with my 89 gt fox body, fuel pump wont turn on, and no injector power, inerta switch is good my question is at the computer the red wire that supplys power to the injectors, relay and inerta switch has no power coming out of the computer? is the computer fried or is Mar 16, 2017 · Learn all about the fox Mustang EEC EFI system sensors and how to diagnose them. 0 and need to know where the fuel pump relay is located, i think its under the drivers seat but not sure. he is very busy and i want my car back. C. May 7, 2009 · Another thing to keep in mind is, the eec relay powers everything were talking about. May 16, 2009 · i have a 91 lx and long story short, my eec is not grounding the relay to turn the pump on. 3yx kzac wqix d1y 1j rorm grimrych inde2tx aaer vvdg