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-   -   Does anyone know if an ECM from a 1991 will work in a 1995? (http://www.wranglerforum.com/f218/does-anyone-know-if-an-ecm-from-a-1991-will-work-in-a-1995-a-149903.html)

Gkrynick22 03-29-2012 07:33 PM

Does anyone know if an ECM from a 1991 will work in a 1995?
 
My ECM is apparently a refurbished ECM and there is no number on the actual ECM. There is a number on the harness that connects to it, but I am not sure if it the actual ECM number. My question is will a 1991 4 cyl manual transmission ECM work in my 1995 4 cylinder manual?

4Jeepn 03-29-2012 07:54 PM

might work, but OBD 1 vs OBD 2 might come into play depending on what years they switched that over, which of course I can't recall, sorry.

Gkrynick22 03-29-2012 08:18 PM

Thanks. I don't think cars or trucks were equipped with obd2 until 1996 (split year for obd 1&2) and 1997 (all obd2). So that shouldn't be a problem.

sevenservices 03-30-2012 03:45 PM

if ALL options are exactly the same it would work. But I remember when I replaced mine they needed my VIN to program it to.

2xs 03-30-2012 03:53 PM

ALL 1996 vehicles are required to be OBD2.
SOME heavy duty vehicles are exempt.
Motorhomes where the chassis was built in 95, but the body finished are registered as 96, but are required to meet 95 standards.

there was no split, some manufacturers dropped the ball,which is wny some vehicles were still OBD1 in 1996 (ford trucks did this on some models up until 2001!). have exemptions, at the factory level.

Read the under-hood emissions decal, that is the GOD sticker.... if its built after 96, but is OBD1, it is required to say it on that sticker, this is a Federal requirement, not a Cali one.

Black Bear 03-30-2012 05:24 PM

Quote:

Originally Posted by sevenservices (Post 2200796)
if ALL options are exactly the same it would work. But I remember when I replaced mine they needed my VIN to program it to.

my 94 2.5 5speed needed new ecm and had to be programmed with the vin also,tried various ones from the junkyard and none worked because of this

brentd711 03-30-2012 07:59 PM

Quote:

Originally Posted by Gkrynick22 (Post 2197721)
My question is will a 1991 4 cyl manual transmission ECM work in my 1995 4 cylinder manual?

No. The '95 speedo gets a signal from the VSS (through the PCM), the '91 has a VSS but also has a cable for the speedo. Check any online parts places and you'll see they don't cross over.

Gkrynick22 03-30-2012 08:18 PM

Quote:

Originally Posted by brentd711

No. The '95 speedo gets a signal from the VSS (through the PCM), the '91 has a VSS but also has a cable for the speedo. Check any online parts places and you'll see they don't cross over.

Thanks for the info.


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