SOLVED - O/D Off Button not working - No O/D Off light on dash when button is pushed.

[saxtech]

The dash light bulb should come on whether the system or button works or not. When you first turn the truck to run position all the warning lights come on specifically to test that the bulbs work, and for no other reason and in no way correlate to that systems status or functionality. Just tests bulbs...

So as improbable as it is, I think you have two problems.

Even some inexpensive scanners that run KOER tests will actually test the od button. My cheapo 20 dollar ancel 310 even does this. You turn the engine on, start the test, turn the wheel a few times, tap the brakes a few times, and press the od button a few times. If the od button failed it will tell you at the end of the test. (Of course it's only saying the PCM got no signal for the overdrive, doesn't pinpoint the issue).

So

So where do I start ? It's starting to sound overwhelming.
Should I "first" tear the dash apart to change the bulb ? Buy a scanner ? Or check a fuse ?

Is it impossible that it could be something as simple as a fuse ? If so, what number fuse should I check ?

 

[fastpakr]

I'm inclined to agree re the two problem diagnosis.

Fuse seems unlikely because you'd see other problems.
Bulb seems almost guaranteed, but doesn't explain the extent of the issue.

Were it me... I'd pull the cluster and check/replace the bulb. While there, I'd also pop apart the pieces to access the switch and wiring. The whole teardown shouldn't take particularly long. You can swap the bulb and troubleshoot the switch issues at the same time.

 

[Dirtman]

I generally find tearing things apart to be around step 115 after doing the simple tests... I do not know if there is a specific fuse for the od function @RonD Knows that stuff, but also test the button like he described which is very simple.

When I get 10 minutes to sit down I'll read through the factory tech manual and see what it says. My manual is for a 2009 but it uses the same overdrive button setup so might be useful info there.

 

[saxtech]

I generally find tearing things apart to be around step 115 after doing the simple tests... I do not know if there is a specific fuse for the od function @RonD Knows that stuff, but also test the button like he described which is very simple.

When I get 10 minutes to sit down I'll read through the factory tech manual and see what it says. My manual is for a 2009 but it uses the same overdrive button setup so might be useful info there.

Thanks Dirtman. As simple as this may seem for you Ranger veterans, its a little nerve wracking for me. Although I am mechanically inclined and can tackle this if I just know "exactly" what to do in step-by-step instructions, I just need to be walked through this process.

I will check back later today to see if you had a chance to read through the manual. I may need instructions also, on how to get at that bulb. I know there's instructions on the site somewhere to change the dash bulbs, I just haven't been able to find them yet.

 

[Dirtman]

I don't think there is a guide on the site for doing the dash bulbs on a 98+ truck, it's for the older models.

 

[pjtoledo]

this is turning into a classic case of making a mountain out of a mole hill.

OD is simply the name given to the top gear in the transmission.
the top gear has a gear ratio such that the output is turning faster than the input, it "overdrives".
in normal driving the tranny shifts into and out of OD as needed.

the OD OFF simple tells the transmission you want to downshift from 4th to 3rd (4R44) .
useful for towing and/or going up long hills.
as an added bonus the PCM keeps the torque converter locked up longer for engine braking.
useful for slowing down while towing and/or going down hills.

whats your RPMs at a cruise of 65-70?
does it downshift if you go full throttle at freeway speeds?

I realize your switch and bulb don't work, but if you don't tow and the tranny shifts OK its sort of a low priority issue.

there should be threads here someplace about changing dash bulbs.

 

[Dirtman]

If you're cruising at 65 and hit that button (if it works) there is an unmistakable downshift. Very simple test. No downshift means that button ain't working.

 

[fastpakr]

I don't think much changed for the Ranger by '03 that would change a removal guide for an earlier truck.

Fair warning - I haven't watched this whole video. But it should apply:

 

[pjtoledo]

a 99 instrument panel

 

[sgtsandman]

The truck isn’t new enough to have a system in place to sense whether a trailer is connected via the wire harness. So, the hitch light shouldn’t be triggering the system.

That system is there more for the back up sensors and cross traffic system. I still have to tell my 2019 to go into tow/haul mode.

 

[saxtech]

If you're cruising at 65 and hit that button (if it works) there is an unmistakable downshift. Very simple test. No downshift means that button ain't working.

At 65 MPH, mine does nothing when I hit the button. No downshift at all..... So should I just go ahead and order a TCS button to make this simple ?

 

[fastpakr]

You can certainly do that, but without a bit of quick testing you can't be sure that the switch is at fault.

 

[saxtech]

You can certainly do that, but without a bit of quick testing you can't be sure that the switch is at fault.

It's the testing that overwhelms me. I need step-by-step instructions on how and what to test. I can do it if I can get testing-for-dumbies instructions from you Ranger veterans

 

[Dirtman]

It's the testing that overwhelms me. I need step-by-step instructions on how and what to test. I can do it if I can get testing-for-dumbies instructions from you Ranger veterans

I'm not the wiring expert here. Ask @RonD He will be able to tell you exactly where and what wires to test. Never order parts before testing. I'm still working so haven't had a chance to check my FSM.

 

[fastpakr]

If you want to keep it -really- simple...

Take apart the cluster and surrounding trim following the video linked previously. Pull the top and bottom cover for the steering wheel.
Replace the bulb and reinstall the cluster - test that the O/D light works now.

Once you've done that, follow the wiring off the shift lever to the connector. It's not far down as I recall. Disconnect the connector. With the key in the run position, use a jumper wire to momentarily connect the two wires on the vehicle side of the connector. This should switch the O/D mode to off. Jumper it again to turn it back on. All you're doing is mimicking the function of the button at the end of the shift lever.

Somebody else with a working system - can you confirm if the transmission needs to be in gear for this? Mine is down for the count at the moment so I can't verify.