1997-2003 Overdrive light blinking
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3rd Gear
Joined: Jul 2022
Posts: 3
Likes: 1
1997-2003 Overdrive light blinking
So i have this problem with my truck where the over drive light is blinking. This problem doesn't even come with a code.
The Haynes repair manual states:
My truck is a 01 f-150 for this year more than likely have the 4R100 transmissions.
So to help all of you with this transmission I found this website to help in the craziness of this problem: http://shop.ukrtrans.biz/wp-content/...logs/4R100.pdf <-- this link is to the manufacture's manual for the transmission. you will find the issue may be the EPC solenoid, the sensor, or any and all electrical wiring locations and tips on how to diagnose both are in the manual.
The Haynes repair manual states:
If the TCIL flashes instead, there's either a sensor failue or a short in the electronic pressure control circuit (EPC).
So to help all of you with this transmission I found this website to help in the craziness of this problem: http://shop.ukrtrans.biz/wp-content/...logs/4R100.pdf <-- this link is to the manufacture's manual for the transmission. you will find the issue may be the EPC solenoid, the sensor, or any and all electrical wiring locations and tips on how to diagnose both are in the manual.
Last edited by JinxedTruck; Jul 3, 2022 at 09:52 AM.
Hotshot
Joined: Jan 2004
Posts: 19,760
Likes: 1,079
From: St Louis
sigh....
The flashing OD light means the PCM has logged a transmission-related fault. It is NOT specific to anything beyond that observation.
One must pull the codes from the PCM and then follow the proper diagnostic procedure in order to accurately diagnose the actual fault. Cheap generic code readers won't do the job, you need something capable of reading "manufacturer-specific" codes.
A 97-03 F150 could have a 4R70W, E4OD, or 4R100, depending on the year (not given) and engine. Look on the door tag to see what the factory installed.
The flashing OD light means the PCM has logged a transmission-related fault. It is NOT specific to anything beyond that observation.
One must pull the codes from the PCM and then follow the proper diagnostic procedure in order to accurately diagnose the actual fault. Cheap generic code readers won't do the job, you need something capable of reading "manufacturer-specific" codes.
A 97-03 F150 could have a 4R70W, E4OD, or 4R100, depending on the year (not given) and engine. Look on the door tag to see what the factory installed.
Fleet Mechanic
Joined: Jul 2019
Posts: 1,312
Likes: 312
the trucks for this years more than likely have the 4R100 transmissions.
Most F150s got the 4R70 as far as automatics go. The 7700s got the 4R100, probably some 5.4 Expeditions, the early years of the generation the 4.2 and 4.6 got the 4R70.
Definitely not “more than likely” than anything else.
Hotshot
Joined: Jul 2020
Posts: 10,364
Likes: 2,595
From: Near Salt Lake City
Most common issue when the light flashes is the OD switch and the wiring coming out of the gear shift lever
So common I keep all three parts in my toolbox
Switch, bezel and one lever (they make a few different lever styles)
You need to check the code
So common I keep all three parts in my toolbox
Switch, bezel and one lever (they make a few different lever styles)
You need to check the code
Hotshot
Joined: Jul 2020
Posts: 10,364
Likes: 2,595
From: Near Salt Lake City
With the right scan tool you can watch the OD switch cycle on and off thru the pid
Good luck
I can change the lever in about 30 minutes
Usually the bezel breaks and the new switch is like the salt
Replace all 3 and be done for another 150k
Good luck
I can change the lever in about 30 minutes
Usually the bezel breaks and the new switch is like the salt
Replace all 3 and be done for another 150k
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,712
Likes: 2,629
From: SE Florida
So i have this problem with my truck where the over drive light is blinking. the Haynes repair manual states: the trucks for this years more than likely have the 4R100 transmissions.
If the TCIL flashes instead, there's either a sensor failue or a short in the electronic pressure control circuit (EPC).
If the TCIL flashes instead, there's either a sensor failue or a short in the electronic pressure control circuit (EPC).
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Hotshot
Joined: Jan 2004
Posts: 19,760
Likes: 1,079
From: St Louis
Usual failures caused by a failed harness depends on the nature of the failure. Chafed wiring could cause a blown fuse, randomly flickering OD light, randomly locking OD in or out, or no response to the switch, depending on which of the individual wires is shorting to ground or power. A completely open wire in the harness usually manifests as no light or no switch function. or both.
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Hotshot
Joined: Jul 2020
Posts: 10,364
Likes: 2,595
From: Near Salt Lake City
I get a kick out of Haynes
When I need to figure out and solve an air distribution issue
When I need to see a HVAC vacuum diagram with the mode switch et al.
I turn to the HVAC section and it says refer to qualified personnel
what the...
When I need to figure out and solve an air distribution issue
When I need to see a HVAC vacuum diagram with the mode switch et al.
I turn to the HVAC section and it says refer to qualified personnel
what the...
Thread Starter
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3rd Gear
Joined: Jul 2022
Posts: 3
Likes: 1
And this is just another example of why I've often said that the Haynes manual only has one use. That use is providing pages to line the bottom of a bird cage. DO NOT believe anything written in a Haynes manual. It seems that the authors just make up information. Most things in that manual are just plain wrong.
Cargo Master
Joined: Dec 2015
Posts: 2,912
Likes: 504
Won't the free FORscan pull tx codes for him?
If so download FORscan and get a cable or BT dongle. Any laptop will run the program
Also there's a decent chance your local FLAPS has a reader capable of getting the Ford codes -- it's worth a shot
If so download FORscan and get a cable or BT dongle. Any laptop will run the program
Also there's a decent chance your local FLAPS has a reader capable of getting the Ford codes -- it's worth a shot
Hotshot
Joined: Jan 2004
Posts: 19,760
Likes: 1,079
From: St Louis
Okay, "FLAPS" is a new acronym, what's it supposed to mean in this context?
Trailering
Joined: Dec 2015
Posts: 18
Likes: 4
From: San Juan Capistrano, CA
Friendly local auto parts store
Yes, Forscan on Windows and Forscan Lite (paid version) on Android (haven't tried iOS) will work just fine. You may need one of the "better" OBDII interfaces, though. Some the el-cheapo ones are somewhat sketchy in how they communicate between the PCM and the host device and cause compatibility issues.
Okay, "FLAPS" is a new acronym, what's it supposed to mean in this context?
Okay, "FLAPS" is a new acronym, what's it supposed to mean in this context?