2012 Ford Mustang Kill Switch How to

[JRMichler]

Originally Posted by baldlobo

no, not if you go through the fuses or the anti-theft relay it shouldn't.

My kill switch cuts the circuit through the fuel injector fuse. I use the switch about 110 to 150 times per week, and it sets the CEL about 2 or 3 times per week.

I get one of two codes. One is for the fuel injectors, the other is for the gas gauge sending unit.

[bestclimb]

get a cheap code scanner ultra or scan gauge. clear the codes before taking it to the dealer.

[UltArc]

Sincerely, thank you everyone for the help. Each day off it rains, and I do not attempt to develop a plan. Since my tank of extreme EOC went awfully bad, I am not EOCing right now. After my oil change and FE comes back up, I may resume it, and work on the switch.

As of now, EOC switch is on pause. I will update on any future info.

[UltArc]

I have recently been actively EOCing, but am so tired of flipping they key-and missing out on miles I am traveling, but not getting credit for. So I installed a kill switch, specifically for a fuse- but it did not work. I pulled the fuse, and the car kept running.

THis is the user manual, page 231 starts fuse labels.
http://www.motorcraftservice.com/pub.../12musog2e.pdf

If anyone has any suggestions or ideas, please let me know. I have looked, but I have to buy new fuses for it, so I do not accidentally ruin my current fuse, and walk to get more. SO, I want to buy them first, then do the test.

Thank you in advance for the continued support.

[Weather Spotter]

I (we) cannot get at the manual. can you copy it into a post?

see if the manual lists the wire going to the fuel injectors, then put the relay into that wire. thats what I did as most newer cars have several things on the same fuse that runs the injectors. Things like fuel pump (you can burn it out with over cycling) so try to find the wires to the injectors. there might be one in the fuse panel. my bothers kia had a separate one but my matrix did not.

[UltArc]

Driver rear window (convertible only) Not used (spare)
SYNC��
Passenger rear window (convertible only) Brake transmission shift interlock (BTSI) Turn signals, Hazard flashers
Left low beam headlamp Right low beam headlamp Courtesy lamps
Switch illumination Security module
Power mirrors Not used (spare)
Center information display, Electronic finish panel, GPS
Climate control
Not used (spare)
Power door locks, Trunk release Not used (spare)
Navigation amp
Diagnostic connector
Fog lamps
Park lamps, License lamps
High beam headlamps
Horn
Demand lighting (battery saver), Gauge pack, Visor vanity lamps
Cluster (battery)
Ignition switch feed
Audio mute (start)
Camera (run/start)

Circuit Breaker Relay
Temperature sensor motor
Restraints control module (RCM)
Reverse parking aid
Not used (spare)
Electronic stability control
Auxiliary body module (ABM) run/start Passive anti-theft system (PATS)
Not used (spare)
Not used (spare)
Radio/Navigation
Not used (spare)
Accessory delay (windows, automatic dimming rear view mirror [including microphone and compass] and door switch III)
Not used (spare)
Heated seat relay coils
Not used (spare)
Wiper relay and module, Blower relay Passenger airbag deactivation indicator (PADI), Occupant classification sensor (OCS) Not used (spare)
Accessory delay relay (windows, automatic dimming rear view mirror [including microphone and compass] and door switch III)


Passenger compartment fuse panel Not used
Not used
Blower motor relay
Powerpoint (body)
Rear defroster
Cooling fan relay
Anti-lock brake system (ABS) pump Wipers


20A** Fuel pump relay (non-Shelby) 25A** Fuel pump relay (Shelby only)
— Not used
10A** Intercooler pump relay (Shelby only) 20A** Heated seats
10A** Alternator sense
20A* Auxiliary body module (ABM) 30A* Starter relay
30A* Rear amplifier (Shaker 1000 radio) 30A* Powertrain relay
20A* Powerpoint (instrument panel)
10A** Powertrain control module (PCM) keep-alive power
10A** Brake on/off (BOO) power
10A** A/C compressor relay
20A** Left high intensity discharge headlamp relay 20A** Right high intensity discharge headlamp relay
— Not used
30A* Passenger front window
— Not used
30A* Passenger power seat
30A* Driver power seat
30A* Front amplifier (Shaker 500 radio) 30A* Driver front window motor
40A* Convertible top motor
Diode Fuel diode — Not used
15A** Fuel injectors (Shelby only) 5A** Rear defroster coil (run/start)


Auxiliary relay with heated seats (if equipped)
On heated seat equipped vehicles, there is a relay box located under the driver seat containing two relays for the driver and passenger heated seats.
236
2012 05+ Mustang (197) Owners Guide, 2nd Printing USA (fus)
15A** G8VA relay G8VA relay G8VA relay — 5A** 5A**
15A** 15A** 15A**
Full ISO relay
Full ISO relay
Full ISO relay
Full ISO relay
Full ISO relay
Full ISO relay
High current relay
Full ISO relay
PCM vehicle power 4 – ignition coil Fuel pump relay
Intercooler pump relay (Shelby only) A/C compressor relay
Not used (spare) PCM run/start
PCM vehicle power 3 – general powertrain components
PCM vehicle power 1 Mass air flow sensor
PCM vehicle power 2 – emissions related powertrain components
Cooling fan relay (high)
Blower motor relay
Starter relay
Rear defroster relay
Front wiper relay
Cooling fan relay (low)
Fuel pump sensor (Shelby only) PCM relay
Not used (Spare)

I tried a few methods, but this was the best I could do. The only fuel injector fuse is only in effect on the Shelby, unfortunately. I was trying to avoid using a relay, I set it up to replace just a mini fuse. I was tinking the PATS might be the next best, but that may only stop starting-not ignition in the engine. I can't refind the forum and post that gave me my first attempt.

[Weather Spotter]

have you tried this one:
15A** Fuel injectors (Shelby only)

or :
PCM vehicle power 4 – ignition coil Fuel pump relay? the issue with this one is that it cuts the fuel pump as well, this can lead to a long restart wait as fuel pressure is built back up. I would try to find the split to the fuel injectors alone and put the relay in there.

Engine kill switch - EcoModder

[JRMichler]

Originally Posted by Weather Spotter

PCM vehicle power 4 – ignition coil Fuel pump relay? the issue with this one is that it cuts the fuel pump as well, this can lead to a long restart wait as fuel pressure is built back up. I would try to find the split to the fuel injectors alone and put the relay in there.

I THINK that a momentary contact kill switch would work here. Hold the switch long enough for the engine to coast to a stop, then release. Once released, the fuel pump should restart and pressurize the fuel system so everything is ready to go when bump started.

[UltArc]

Originally Posted by JRMichler

I THINK that a momentary contact kill switch would work here. Hold the switch long enough for the engine to coast to a stop, then release. Once released, the fuel pump should restart and pressurize the fuel system so everything is ready to go when bump started.

100% Successful so far. Only used about five times at this point, but it's working flawlessly.

Originally Posted by Weather Spotter

have you tried this one:
15A** Fuel injectors (Shelby only)

or :
PCM vehicle power 4 – ignition coil Fuel pump relay? the issue with this one is that it cuts the fuel pump as well, this can lead to a long restart wait as fuel pressure is built back up. I would try to find the split to the fuel injectors alone and put the relay in there.

Engine kill switch - EcoModder

The Shelby only is only for the Shelby...now I wouldn't mind a supercharged 5.8, but it's a little more than my six lol

I did get it working with another fuse. At this point, it is working great. My only concern is it shifting out of the spot, and the connections not being secure.

[UltArc]

Originally Posted by bestclimb

get a cheap code scanner ultra or scan gauge. clear the codes before taking it to the dealer.

I use both at the moment.

Originally Posted by JRMichler

My kill switch cuts the circuit through the fuel injector fuse. I use the switch about 110 to 150 times per week, and it sets the CEL about 2 or 3 times per week.

I get one of two codes. One is for the fuel injectors, the other is for the gas gauge sending unit.

Each use sets off my UG, but no codes yet. As soon as I flip the switch back everything goes to normal, no CEL yet.