Truck seems like a dog

[User_name]

So I have code 52. Truck runs rough and is a dog. Even for a tbi 350.
1995 c2500 5.7 tbi nv4500 trans.
What's the process for diagnosing a code 52? Can't find many forums here or much info anywhere.
The ecm has been tampered with before. The connections look like they have red grease on them and a while ago I found it not even buckled down in its holder.

 

[Schurkey]

Code diagnostic procedure will be in the service manual. The sticky threads have links to service manuals that can be downloaded free.

www.gmt400.com/threads/88-98-service-manuals.43575/

88-98 Service Manuals

Over the years I have collected a bunch of GM service literature. Links to PDF Scans of service and STG manuals and a links to the Parts manuals. You'll need the FREE Adobe Acrobat reader to open these files. Get it directly from Adobe here {http://get.adobe.com/reader/} If you're not...

www.gmt400.com

 

[Komet]

Open up the box and make sure everything is seated well in there. Take a picture, maybe it's an aftermarket chip or something.

 

[PlayingWithTBI]

What's the process for diagnosing a code 52?

This may help too.
www.repairpal.com/gm-obd-I-code-chart

GM OBD I Trouble Code Chart

Code Description Code 12 No distributor reference pulse (diagnostic test active) Code 13 Oxygen sensor circuit open or no

repairpal.com

 

[User_name]

Ok. Cleaned grease out of connectors and insured that the prom is set correctly. No change. Code came back.

Anyone know where I can get a prom from? Or any links to somewhere that can burn a new prom chip? I have a reman ecm on the way. Hope that solves the issue.

 

[1997]

looks like 52 has a couple of causes ......

52 (1994-1995)

System Voltage – high

Alternator, jump started

 

[User_name]

@1997 That's for the diesels. The gasser have a different code meaning

 

[PlayingWithTBI]

Anyone know where I can get a prom from? Or any links to somewhere that can burn a new prom chip?

There are guys that can do it for you on Gearhead-EFI.com that can do that for you. Dave w (Old School EFI) is one. There's a few here too...

GearHead EFI Forums

Fuel Injection Conversion and tuning information and diagnostics GM ECM!

www.gearhead-efi.com

 

[1997]

@1997 That's for the diesels. The gasser have a different code meaning

from manual, gasoline ... unless i've missed something.

 

[Schurkey]

The date on that manual is 3--94. Leads me to believe that it's a '95 service manual--correct for the application as long as the proper section is being used--gasoline vs. diesel, small-block vs. big-block, etc. It may be that there is no engine distinction for that code (applies to all engines, or applies to all gasoline engines).

As much as I love scan tools--and used to own a 2500-series "Red Brick" like the one pictured, I like service manuals just as much. APPARENTLY there's a flaw in the Snap-On software that misrepresents the cause of Code 52. Another, less-likely possibility is that the wrong VIN number was entered into the tool, so that there's a communication problem between the tool and the vehicle.

A voltmeter (including the voltage readout of the scan tool itself) would tell that tale.