pcm help
Thread Starter
|
New User
Joined: Aug 2015
Posts: 4
Likes: 0
pcm help
i have a 1994 f250 with the 7,3 idi turbo the other day my od light started flashing and it went into limp mode so i came back home and went to troubleshooting it i used the wire to send the pcm into test mode to do a key on engine off test but my service engine light has quit working i checked the fuse bulb wiring it's all good so i tried to get the codes with my test light under the hood but it didn't work either and i tried the analog volt meter and it didn't work if i bought one of the obd1 code readers do you think i could get the codes or will i be flushing money down the toilet? i have just about decided i have a pcm down.but my glow plugs and all my other gauges work as they are suppose to.any help sure would be app.
i ain't rite
Joined: Mar 2005
Posts: 65,445
Likes: 5,517
From: Marlboro Mental Hospital.
<p>welcome to FTE.</p><p>the IDI does not have a PCM like the other trucks do, it is a mechanical engine. the service engine light will only come on if oil pressure is low, or coolant temp is high. not sure if it works with the trans though, i never had an auto overdrive trans in my trucks.</p><p>does your tach and speedometer work? if either of those stop working the trans will go into limp mode.</p><p> </p>
Postmaster
Joined: Oct 2014
Posts: 3,914
Likes: 9
From: Thomaston
Only the red one will come on. The yellow has nothing to test
Fleet Mechanic
Joined: Aug 2011
Posts: 1,570
Likes: 258
These trucks have 2 lights that get mistaken for each other, one is an engine light that comes on with low oil pressure or high coolant temperature, the other is the check engine light that is only used on gasser (and maybe the psd).
Your TECA is alive, it's found a problem and is telling you with the od light, most of the time the obd1 connector in these trucks are so corroded that it makes it hard to retrieve codes, you can try cleaning the pins or replace the pigtail. You can get the odb1 tester for these trucks but if it can't make connection you'll be at this same point again. Try cleaning the contacts and using the test light again.
Your TECA is alive, it's found a problem and is telling you with the od light, most of the time the obd1 connector in these trucks are so corroded that it makes it hard to retrieve codes, you can try cleaning the pins or replace the pigtail. You can get the odb1 tester for these trucks but if it can't make connection you'll be at this same point again. Try cleaning the contacts and using the test light again.
i ain't rite
Joined: Mar 2005
Posts: 65,445
Likes: 5,517
From: Marlboro Mental Hospital.
<p>if i remember correctly, the old EEC-IV system does not store codes. you need an active code to read it.</p>
Trending Topics
Thread Starter
|
New User
Joined: Aug 2015
Posts: 4
Likes: 0
well i took a shot in the dark and pulled the vss censer out yesterday and the end of it was all nasty so i cleaned it and removed the battery terminals and it is shifting like it should and no lights blinking i app. the help from everyone maybe i can help on of y'all sometime
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
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
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Thread
Thread Starter
Forum
Replies
Last Post
Slash19
1999 - 2003 7.3L Power Stroke Diesel
11
May 11, 2024 09:06 PM
mrblue01
1987 - 1996 F150 & Larger F-Series Trucks
2
Dec 1, 2001 01:33 PM