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  •  » FYI Ford, Classic Mustang Tech Discussion
  •  » Clutch Safety switch and Efi

    • 1 of 1

       

    4/10/2022 10:53 AM  #1

    Alan
    I FYI 24-7

    Offline

    From: Axtell KS
    Registered: 4/03/2013
    Posts: 516

    Clutch Safety switch and Efi

    Still slowly working on the 67 coupe installing a 5.0 with EFI. T5.

    I don't have a switch on my clutch and see the clutch safety switch wire in the loom. I am assuming it is for idle purposes and starting.

    Do i need one, or can it be put into the neutral safety switch wiring?

     

    67 Coupe, 5.0 EEC IV Fuel injected. T5, 3:70 rear
     

    4/10/2022 11:32 AM  #2

    Nos681
    Senior 24-7 FYI Addict

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    From: Atlantic Mine, Michigan
    Registered: 7/14/2016
    Posts: 3,331

    Re: Clutch Safety switch and Efi

    What are the wire colors or ecm pinout numbers?

    What year harness are you modifying?

     

    4/10/2022 12:37 PM  #3

    Mustsed
    FYI FORD Member

    Offline

    From: Antalya / Turkey
    Registered: 3/30/2022
    Posts: 56

    Re: Clutch Safety switch and Efi

    Hi everybody,

    The Neutral Drive Switch (or NDS or NSS) works by feeding a 12v  signal to the ecm #30 wire when cranking!

    The Clutch Engine Switch (or CES) works by interrupting the  #30 wire to the #46 signal return wire OR connecting them (can't remember exactly). Some T5s also have a Neutral Gear switch (or NGS) that goes paralel to the clutch switch.

    I have the same setup on my '67 and have none of the above installed so i don't have get in the car to start the engine.

    Mustsed

     

    4/10/2022 12:44 PM  #4

    6sally6
    Hyper FYIFORD ADDICT

    Offline

    From: Surfside Beach,SC
    Registered: 4/02/2013
    Posts: 6,852

    Re: Clutch Safety switch and Efi

    How old are you Alan?!!
    The reason I axe is.....IF you're 60-ish + then you grew up when guys 'drove' cars and KNEW to do several things involved in 'driving' a car.
    One was...depress the clutch when you want to crank the engine. IF you didn't it would jump & growl and do the Hucle-Buck
    until you said "WOW.. I forgot to mash the clutch!"
    IF you didn't it might smash into the car (or wall) in front of you!
    I guess I'm trying to say........"I don't NEED some factory installed "safety switch" to make me a good & safe driver...it's up to me to 'think a little' and depress the clutch before I crank the engine!
    This isn't a 'knock' on younger drivers.
    Since we choose to enjoy these 'primitive"(by today's standards) hot rods/performance cars/old skool rods....they need to be DRIVEN...not just rode in!
    (Since you are a regular on MS FYI Fords I already know you know this)
    Cut it off and tape up the end!!!
    6sally6

    Get busy Liv'in or get busy Die'n....Host of the 2020 Bash at the Beach/The only Bash that got cancelled  )8
     

    4/10/2022 1:39 PM  #5

    Alan
    I FYI 24-7

    Offline

    From: Axtell KS
    Registered: 4/03/2013
    Posts: 516

    Re: Clutch Safety switch and Efi

    https://www.painlessperformance.com/Manuals/60510.pdf

    Dan, I have a painless wiring harness 60510 with and A9L ecm. 
    Was just wondering if i could get by without the switch for now. 

    6s6, yes i am 60+. And have also started the car without the clutch in. Was in 1st gear and it started on the first crank. Came with 2" of going through the garage door.  Gives you that "Man that was stupid feeling''



     

    67 Coupe, 5.0 EEC IV Fuel injected. T5, 3:70 rear
       •Thread Starter
     

    4/10/2022 2:06 PM  #6

    Mustsed
    FYI FORD Member

    Offline

    From: Antalya / Turkey
    Registered: 3/30/2022
    Posts: 56

    Re: Clutch Safety switch and Efi

    Hi Alan,

    Page 9 upper diagram is what you are looking for!

    Mustsed

     

    4/10/2022 3:15 PM  #7

    BTaylor
    FYI Addict

    Offline

    From: Carrabelle, FL
    Registered: 4/02/2013
    Posts: 127

    Re: Clutch Safety switch and Efi

    I wired my T5 into my factory wiring and now it must be in neutral to start the car.
     

    68 Cougar XR7 347 stroker T5 3:80
     

    4/10/2022 5:17 PM  #8

    Nos681
    Senior 24-7 FYI Addict

    Offline

    From: Atlantic Mine, Michigan
    Registered: 7/14/2016
    Posts: 3,331

    Re: Clutch Safety switch and Efi

    http://www.veryuseful.com/mustang/tech/engine/images/91-93_5.0_EEC_Wiring_Diagram.gif

    In lower right hand corner are 2 switches.

    The foxbody Clutch Pedal Switch actually has 2 switches built into it.
    One for start circuit, second for ECM pins 30 & 46.

    Near front upper LH side on T5 is the Neutral Sensing Switch with attached pigtail, if it is still there.  This switch was connected in parallel to the Clutch Pedal Switch.

    The Clutch Pedal Position is closed when clutch is depressed to floor.

    The Neutral Sensing Switch is closed when in transmission is in neutral.

    Take a look at the following pages from Ford Racing:

    https://www.jegs.com/InstallationInstructions/300/397/397-M-12071-A50.pdf

    Page 12…bottom “Technical Tidbit”

    Page 18…Pin 30 & 46 descriptions

    Page 19…Upper LH ….wiring of manual transmission

    With my modified factory 91 harness, I ran 30 & 46 with my diagnostic connectors.
    When I need to perform a KOER test, a jumper is placed across the factory connector pins.
    Eventually I may run to transmission or a toggle switch.

    Last edited by Nos681 (4/10/2022 5:31 PM)

     

    4/10/2022 5:38 PM  #9

    Nos681
    Senior 24-7 FYI Addict

    Offline

    From: Atlantic Mine, Michigan
    Registered: 7/14/2016
    Posts: 3,331

    Re: Clutch Safety switch and Efi

    I ran 30 & 46 near my test connectors.
    I even have a Malfunction Indicator Light (MIL)…aka “check engine” so I can pull codes.
    It’s over by glove box and heater.
    My ECM is above the factory radio.


    Last edited by Nos681 (4/10/2022 5:49 PM)

     

    4/11/2022 5:13 PM  #10

    RTM
    Senior 24-7 FYI Addict

    Offline

    From: Cape Coral FL
    Registered: 5/22/2019
    Posts: 1,716

    Re: Clutch Safety switch and Efi

    6sally6 wrote:

    How old are you Alan?!!
    The reason I axe is.....IF you're 60-ish + then you grew up when guys 'drove' cars and KNEW to do several things involved in 'driving' a car.
    One was...depress the clutch when you want to crank the engine. IF you didn't it would jump & growl and do the Hucle-Buck
    until you said "WOW.. I forgot to mash the clutch!"
    IF you didn't it might smash into the car (or wall) in front of you!
    I guess I'm trying to say........"I don't NEED some factory installed "safety switch" to make me a good & safe driver...it's up to me to 'think a little' and depress the clutch before I crank the engine!
    This isn't a 'knock' on younger drivers.
    Since we choose to enjoy these 'primitive"(by today's standards) hot rods/performance cars/old skool rods....they need to be DRIVEN...not just rode in!
    (Since you are a regular on MS FYI Fords I already know you know this)
    Cut it off and tape up the end!!!
    6sally6

    I launch my dads tractor one time.  I learned real quick what not to do.  I think I was only 12 or 14 when I made that mistake.
     

     

     

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