1990 bronco wont go in to 4lo

[srhbronco]

Its the push button engages into 4hi but when you stop and put in neatral and push 4lo the light just flashes

 

[miesk5]

yo SRH,

WELCOME!

Take time to read Ford's Four Wheel Drive (4X4) General Information, Operation & Troubleshooting TSB 92-1-8 - Includes Electric Shift On The Fly (ESOF) Troubleshooting

excerpts;

Page 9

shift control module self-test

run the shift control module self-test. Figure 22 shows the module with pigtail "A," "B" and "C" attachments. The self-test button and self-test LED are located on the side of the shift control module.

Disconnect the "B" and "C" connectors, turn on the ignition and allow 4 seconds for the module to power up. Then push the self-test button. If the LED doesn't illuminate, the module is dead and must be replaced. If the LED comes on and stays on for 30 seconds, there is an error condition and the module will have to be replaced. If the module is OK the LED will flash 4 times.

This test, however, is not 100 percent accurate. During the test, the vehicle isn't operating, so the shift control module isn't receiving data and initiating shifts. If the unit passes the self-test, it's probably a good module. Go on to check for other probable causes, but don't rule out the module entirely. If your search doesn't turn up any other cause, it may be the module after all. You may have to try replacing the module even though it passed the self-test.

Don't buy a module yet;

go to,

Page 10

If the vehicle won't shift into 4L, check the speed sensor and the transmission interlocks (neutral or clutch in). Also check the 4L switch (C3) to see if the module is getting a signal. Be sure to check for corroded connections.

It may seem strange to say this, but you should ask the owner/operator if this was the first time the vehicle was ever shifted into 4L. Many vehicles are purchased and operated for considerable periods of time before a shift to 4L is made. The problem may be a defective part that was there from the beginning.

If the vehicle is brought to the shop in 4L with the report that it won't shift back to 4H, your first check is to follow the proper sequence of being stopped and having the vehicle in neutral (or clutch in) when pushing the switch. If this doesn't do the trick, check the 4L switch and the motor position sensor.

GL!

 

[srhbronco]

Thanks I will try this when I get home it was a old man bronco that passed away 2 years ago it only has 55000 mi les on and has never seen mud so it might not have ever been in 4lo

 

[miesk5]

yo srhbronco,

YW

Also;

Tke a quick look @

1356 Electric Shift Motor

Tap it with a rubber mallet ot ball peen.

"...Most units fail because of water or mud intrusion. Carefully inspect motor boot or protective coverings. Be sure connector seals can keep water and debris out. Check wiring harness and connector. Replace or repair wiring as necessary. After installation, periodically select 4-wheel drive mode to ensure operation when needed..."

Source: by CARDONE®

1356 Electric Shift Motor Troubleshooting & Repair (for Rangers, but motors are same/similar)

Source: by Craig T E http://therangerstation.com/tech_library/TCaseshiftmotor.htm

1356 Electric Shift Motor Repairs (for Explorers, parts/info is same/similar for Bronco, Ford Trucks)

Contributed by Alfredo C. at http://web.archive.org/liveweb/http://web.archive.org/web/20041113085019/http://www.glue.umd.edu/~singletn/web/pages/tcase.html

Note; orig site was deleted, so this is slow to Load archived copy by web.archive.org

My Explorer remains in 4x2, and nothing happened when I tried 4x4 or Low Range buttons. I did all the tests described in the article, and I concluded that the problem was the transfer case sensor.

I took apart the whole case. I verified that the white wheel with the printed circuit (photo 1) had been unstuck from the central axis. I solved this problem with some dots of Loctite.

 

[wkenyon07]

Hi I'm completely new to the site, and pretty much a bronco newbie. i have a 93/push button TC with the same problem. the lil excerpt you posted....does it apply to me also?????

 

[miesk5]

Hi I'm completely new to the site, and pretty much a bronco newbie. i have a 93/push button TC with the same problem. the lil excerpt you posted....does it apply to me also?????

yo KEN,

WELCOME!

Yes, the Troubleshooting applies to your 93 push button tranfer case

 

[sgtpowell88]

so are y'all saying if the low range light is a contenus bink that its not in 4x4 low?