1997 f250 hd
Thread Starter
|
Trailering
Joined: Sep 2021
Posts: 23
Likes: 2
From: Midvale Utah
1997 f250 hd
My truck is acting crazy right now. It all started after spraying off my rubber floor inside the truck. Ever since I've started having all kinds of problems. First the check engine light came on, followed by the od light flashing. The truck started randomly dying at idle and the transmission is whack. It shifts way too fast, it won't gear down when I accelerate, and it started shifting super hard. The check engine light comes and goes and that's when it dies is when it comes on. I got the codes 12-26-54 and128. I think my computer has gone bad but any ideas would help. Thanks
Fleet Owner
Joined: Oct 2005
Posts: 20,786
Likes: 1,751
From: Kentucky
You will not get a mix of two and three digit codes. It's two OR three. Your 1997 model year truck will display three codes.
Try running the Key On Engine Off (KOEO) tests and Stored Code display again and keep in mind you are expecting three digit codes.
Try running the Key On Engine Off (KOEO) tests and Stored Code display again and keep in mind you are expecting three digit codes.
Thread Starter
|
Trailering
Joined: Sep 2021
Posts: 23
Likes: 2
From: Midvale Utah
My Chilton manual has codes in it from the number 11 all the way to 998. Thats for the OBD1 system that my truck has. I sprayed out under my hood the other day and my truck has been going crazy ever since.
Thread Starter
|
Trailering
Joined: Sep 2021
Posts: 23
Likes: 2
From: Midvale Utah
First my od light was flashing, followed by the check engine light and the engine dying at idle. The transmission is shifting way too fast, from 1st to overdrive in like 10 or 20 seconds. Sometimes it shifts so hard it shakes the whole truck, slams into gear. Do you think that I fried my computer? I pulled it out and inspected it but I can't see much wrong other than a little bit of a dark spot in one area.
Fleet Owner
Joined: Oct 2005
Posts: 20,786
Likes: 1,751
From: Kentucky
Ford started the transition from two to three digit codes in 1991. Your truck is displaying three digit codes, you are interpreting them as two digit. Continue to do so at your own peril.
I suppose it's possible to get water on/in the computer if you flooded the interior with the hose. It does have a pretty tight seal, but anything is plausible. Keep thinking you have two digit codes and your wallet thickness will decrease exponentially.
I suppose it's possible to get water on/in the computer if you flooded the interior with the hose. It does have a pretty tight seal, but anything is plausible. Keep thinking you have two digit codes and your wallet thickness will decrease exponentially.
Fleet Owner
Joined: Oct 2005
Posts: 20,786
Likes: 1,751
From: Kentucky
Assuming the codes you listed are from the Key On Engine Off (KOEO) tests and Stored Code display, group them as three digits you are getting:
122 (KOEO) TPS circuit below minimum 0.6 volts.
654 (KOEO) MLP sensor not in park position
128 (CM) MAP sensor vacuum was not greater than 2 in-Hg (7 kPa) during normal vehicle operation.
Codes 122 and 654 can cause the computer to go into limp mode and trigger late/harsh shifts. Code 128 is from Stored Codes so it happened sometime in the last 40/80 drive cycles.
122 (KOEO) TPS circuit below minimum 0.6 volts.
654 (KOEO) MLP sensor not in park position
128 (CM) MAP sensor vacuum was not greater than 2 in-Hg (7 kPa) during normal vehicle operation.
Codes 122 and 654 can cause the computer to go into limp mode and trigger late/harsh shifts. Code 128 is from Stored Codes so it happened sometime in the last 40/80 drive cycles.
Thread Starter
|
Trailering
Joined: Sep 2021
Posts: 23
Likes: 2
From: Midvale Utah
According to my Chilton manual, and if I am reading the codes right, code #12 rpm unable to reach upper test limit. #26 vaf/maf out of self test range, and another one saying TOT sensor out of self test range. #54 ACT sensor circuit open and #128 MAP vacuum circuit failure. So this is why I'm thinking it's my computer. This makes more sense with what's going on with my situation than the two that your numbers say
Trending Topics
Thread Starter
|
Trailering
Joined: Sep 2021
Posts: 23
Likes: 2
From: Midvale Utah
Im probably wrong but with the engine dying, the tranny acting crazy and everything else it seems like the computer. So if you are interpreting the numbers correctly, what do you suggest?
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
Fleet Owner
Joined: Oct 2005
Posts: 20,786
Likes: 1,751
From: Kentucky
I'll tell you again you will never get a mix of two and three digit codes. It's two OR three. My Ford manual shows a 1997 F250HD/350 will display three digit codes. I guess Chiltons knows more than Ford so I will let you proceed down this bunny hole. Maybe you did flood the computer and the codes are bogus and therefore a moot point.
Fleet Owner
Joined: Oct 2005
Posts: 20,786
Likes: 1,751
From: Kentucky
Did you also hose down the engine compartment?
You need to measure the TPS VREF input and and output with the key in the Run position to see if Code 122 is valid. Verify the MLPS, located on the driver side of the transmission, is in Park. The MAP code is a bit difficult to measure with a DVM because the output is varying frequency not voltage. Chiltons and other reference manuals will tell you the output is voltage, but they are mistaken for this vintage truck.
TPS and MAP sensor information
Ford Fuel Injection » Throttle Position Sensor (TPS)
Ford Fuel Injection » Manifold Absolute Pressure Sensor (MAP)
MLPS information
Location
You need to measure the TPS VREF input and and output with the key in the Run position to see if Code 122 is valid. Verify the MLPS, located on the driver side of the transmission, is in Park. The MAP code is a bit difficult to measure with a DVM because the output is varying frequency not voltage. Chiltons and other reference manuals will tell you the output is voltage, but they are mistaken for this vintage truck.
TPS and MAP sensor information
Ford Fuel Injection » Throttle Position Sensor (TPS)
Ford Fuel Injection » Manifold Absolute Pressure Sensor (MAP)
MLPS information
Location
Cross-Country
Joined: Oct 2021
Posts: 60
Likes: 37
They sell the same reader at AutoZone. $29.99. I second this recommendation. As simple as counting a flashing light sounds, this reader takes all of the guesswork out of the equation. It also remembers the codes, so you don't have to sit and watch it.
Thread
Thread Starter
Forum
Replies
Last Post
Myron Bennell
1997 - 2006 Expedition & Navigator
10
Aug 3, 2015 06:51 AM
chrisginco
1987 - 1996 F150 & Larger F-Series Trucks
1
Apr 25, 2013 04:36 AM
rustee90-150
1987 - 1996 F150 & Larger F-Series Trucks
5
Nov 11, 2007 05:03 PM