O/D light flashing, lots of posts no resolutions - Ford Powerstroke Diesel Forum
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Old 04-01-2013, 01:35 PM
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Question O/D light flashing, lots of posts no resolutions

I have a 94' F250. After reading lots of threads i have discovered that many people have the same issue as me. Occasionally my O/D light will flash, giving me Very harsh shifts. I can restart the truck and the issues will go away. When the light is not flashing the truck drives perfect. I have no other trouble lights, and all gauges work correctly. I have a list of codes pulled from the truck. I changed the Throttle Position Sensor a couple weeks ago with no luck. I am still getting the codes, and the problems.

Here are the codes,
23: Throttle sensor out of range or throttle set too high - TPS
43: (R)HO2S sensor not reading (run at 2000 rpm's for 2 minutes and retest - check for HO2S switching)
(M) Was lean at WOT for 3 seconds or more - Fuel control
63: Throttle Position Sensor (TPS) signal too low TPS
99: (R) ISC needs to learn (Let idle for 2 minutes, Erase memory and retest)
Transmission EPC circuit/solenoid failure - Transmissions

I am kind of thinking its a ground issue or something along those lines. Don't really know where to start. I do not know what the HO2S Sensor is either, so any guidance on that would be awesome as well.

Thanks in advance.

-Ian
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Old 04-01-2013, 01:47 PM
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HO2S == Heated Oxygen Sensor. Some vehicles have an unheated oxygen sensor in the exhaust manifold, and a heated oxygen sensor at the catalytic outlet. Our trucks don't have either. How are you obtaining the codes? Your truck being a '94, is it a PSD? Does it have the OBD-II style connector under the dash?
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Old 04-01-2013, 01:53 PM
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Quote:
Originally Posted by madpogue View Post
HO2S == Heated Oxygen Sensor. Some vehicles have an unheated oxygen sensor in the exhaust manifold, and a heated oxygen sensor at the catalytic outlet. Our trucks don't have either. How are you obtaining the codes? Your truck being a '94, is it a PSD? Does it have the OBD-II style connector under the dash?
I do have the PSD, and I had the codes pulled from a local trans shop with a snap on code reader. I do not have the OBD-II. Google gave me the code translation... I just went back to look at the chart, and code 43 also means (Was lean at WOT for 3 seconds or more - Fuel control) What does WOT mean?

The trans shop doesn't believe the problem to be in the transmission. They say fix the engine problems and the trans issues will go away. I Have a great Transmission shop, but havnt been able to find a good diesel shop around here. Just a bunch of parts changers!
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Old 04-03-2013, 05:55 PM
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bump bump...
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Old 04-05-2013, 11:40 AM
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WOT = wide open throttle. Have you had your pcm re-flashed to make it OBD-II compliant?
The codes that you are translating are for gas engines not diesel. The OD flashes only with transmission codes.
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Old 04-05-2013, 12:16 PM
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what jack said.^^^^^
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Old 04-05-2013, 12:20 PM
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That's what I thought. I am at a loss as to what's causing this. I have has no issues for 2 days now. Idk I it's ever been flashed. I just googled the codes. I'm so beyond stumped here. Shop keeps telling me that there is a probl in the throttle position sensor


Sent from AutoGuide.com App
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Old 04-05-2013, 01:02 PM
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I was having major issues turned out to be my solenoid pack. not saying yours is, but these damn electronic trans can do some funny things, hence why i no longer have that truck
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Old 04-05-2013, 01:02 PM
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TPS will not give you a trans code. But the fipl (on side of trans behind shift lever) can if out of adjustment or messed up. Otherwise it is a trans internal problem.
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Old 04-07-2013, 11:17 AM
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What does FIPL stand for, im having a similar issue with the OD light flashing but truck wont hardly move in drive and moves ok in first and second on the lever. Reverse will move pretty well.
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