Brake Shift Interlock - 1993 Taurus - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Electrical
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 09-15-2006, 08:51 PM
Member
 
Join Date: Nov 2002
Location: Scottsville
Posts: 123
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Brake Shift Interlock - 1993 Taurus

On a 1993 Taurus GL, 3.8 L, V-6, it is occasionally impossible to move the shift lever out of park to any other position even with the foot firmly planted on the brake pedal with the engine running.

When this happens, the operators manual indicates that the interlock can be bypassed by turning the ignition off and into the unlocked position which permits the lever to be moved out of park with or without the foot on the brake pedal. Then the car can be restarted in neutral.

The online sites do not show the wiring for the brake shift interlock circuit but I imagine that there may be an electrical solenoid which keeps the shift lever locked in the park position until the brake pedal is depressed. I suspect that the brake pedal switch is intermittent since pumping the brake will occasionally release the lever.

Any tips on how this circuit actually works, how to permanently defeat it, or what generally happens to this "wonderful safety feature" would be greatly appreciated.

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 09-15-2006, 11:07 PM
cucumber1949's Avatar
T-Bucket, Corvette, Mustang
 
Last wiki edit: Removing stuck fasteners Last photo:
Join Date: Nov 2004
Location: Greater Cleveland, OH
Age: 65
Posts: 507
Wiki Edits: 1

Thanks: 0
Thanked 5 Times in 5 Posts
I once defeated this on a Ford Escort by removing the center console, exposing the shifter and the mechanisms at the base of the shifter, including the solenoid which causes the shifter lockout. Unplug the wires from the solenoid, and use a zip tie or some other type of restraint to hold the solenoid pin back out of the locked position. The shifter will now move through any gear, engine started or not.

I hope you understand that this will result in an UNSAFE condition.

Now before some moderator on this board gets excited, understand I do not like to see this performed unless you and only you are doing this one time to get your car to a repair shop to get this fixed. A faulty neutral safety switch may allow the car to start in gear. Also imagine having a youngster sitting in the driver seat while you're in the convenience store for a minute, and he moves the shift lever out of park, and the car starts rolling, towards another youngster......

You get the picture, I'm sure.

Last edited by cucumber1949; 09-15-2006 at 11:14 PM.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 09-16-2006, 01:01 AM
docvette's Avatar
Hotrodders.com Moderator
 
Last wiki edit: Rebuild an alternator Last photo:
Join Date: Mar 2004
Location: Lafayette, california
Age: 62
Posts: 7,362
Wiki Edits: 12

Thanks: 0
Thanked 6 Times in 3 Posts
Doc here,

IIRC, there was a recall for that problem..you might want to do some research on that subject or ask the dealer..but I believe it was a safety issue.

This , coming form a "Not A Ford Guy" ..so I could be in error..

As I remember, it was the opposite that was occuring..causing the shifter to pop into reverse while idling in park..

Check it out..

Doc
__________________
Aftermarket Solutions
Electronic & Electrical
Innovations
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 09-16-2006, 08:00 AM
Member
 
Join Date: Nov 2002
Location: Scottsville
Posts: 123
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Brake Shift Interlock

Hello Cucumber 1949 and Docvette,
Thank you for the tips about the brake shift interlock. Since the car is close to the end of useful life and I'm the only driver, I'll see what I can do to avoid implementing the strategy of always starting the car by shifting out of park when I unlock the ignition before starting it. That's a difficult mental step after a lot of years doing it the regular way.

I agree that the prospect of the lever moving out of park while idling in park if I defeat the interlock would not be good since I do have a couple dogs who are occasionally present when I briefly get out of the car to shut the garage door or pick up the mail, etc. Neither dog has learned to drive yet but they appear to have quite a contest to see who occupies the driver's seat when I leave it.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 09-16-2006, 12:22 PM
Member
 
Join Date: Nov 2002
Location: Scottsville
Posts: 123
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Brake Shift Interlock Probable Fix

I took a close look a the latch mechanism under the instrument panel which inhibits the shift lever from moving out of park when the car is running until you step on the brake. This was on the 93 Taurus GL. Anyway, the lubricant on the arrangement seemed to be a bit stiff for as much of it as I could see with my head under the dash and my feet on the headliner.

I tried bathing the general area with generous shots of aerosol PB penetrating lubricant and worked the mechanism a bit in between PB baths. Now the car not only smells nice from the penetrating fluid but the thing no longer hangs up. So far so good! I like it buy my wife hates the smell of the PB. (Penetrating Blaster).
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 09-16-2006, 01:25 PM
docvette's Avatar
Hotrodders.com Moderator
 
Last wiki edit: Rebuild an alternator Last photo:
Join Date: Mar 2004
Location: Lafayette, california
Age: 62
Posts: 7,362
Wiki Edits: 12

Thanks: 0
Thanked 6 Times in 3 Posts
Doc here.

KEWL!!

Let us know...BTW check the recalls..the service is free and good for life.

Doc
__________________
Aftermarket Solutions
Electronic & Electrical
Innovations
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 09-16-2006, 02:24 PM
pmeisel's Avatar
Glad the Jeep is on the road
 
Last wiki edit: How to identify a Ford V8
Join Date: Jan 2004
Location: Meridian MS & Vermilion Ohio
Age: 58
Posts: 814
Wiki Edits: 8

Thanks: 0
Thanked 1 Time in 1 Post
IIRC the Taurus problem was a sticky mechanism which would probably respond to the treatment described, I don't think they did a recall but there was probably a TSB.

Doc, the "jump out of park" problem you remember was on C4s and maybe some C6s too, the latch that held the "rooster comb" shift lever inside the tranny was apparently not positive enough, or would sit on the flat between park and reverse. The company swore it was impossible but all the same implemented a bunch of corrective actions -- Product change request number 783527 items 1 through 27 (my mind is a repository of useless facts).
Reply With Quote Quick reply to this message

Recent Electrical posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
How Does This Stuff Work? docvette Electrical 3 06-18-2006 04:00 AM
Taurus Brake Caliper...Slow Release. awbazar Suspension - Brakes - Steering 5 02-22-2006 05:33 PM
Non Hotrod Brake Question 1993 S-10 zonk Suspension - Brakes - Steering 2 12-04-2005 09:28 PM
Wheel clunking and brake squeal skizot Suspension - Brakes - Steering 29 10-09-2004 07:17 AM
Hotrodders Knowledge Cluster: Disc Brake Conversions Jon Suspension - Brakes - Steering 0 08-29-2003 04:34 PM


All times are GMT -6. The time now is 10:46 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.