ECM Code 41, after changing EPROM
Thread Starter
Intermediate
Joined: Jan 2010
Posts: 47
Likes: 10
From: Dania Beach, Florida
ECM Code 41, after changing EPROM
I'm got a ECM Code 41, (Memcal error) after changing the EPROM on the Memcal. The EPROM was failing so I copied it an programed a new chip.
Removed the old chip from the carrier and replaced it with a new chip(National Semi NM27C256Q-100)
The numbers on the original chip were (014-045915-AD8947B).
The car runs perfect, haven't taken it for a long drive yet. Before I changed the Chip, I went to a junk yard and got a few memcal's but only off of 6cycliners.
I programed one with the original chip's code (Erased with a ultraviolet light), the car runs great and I didn't have the ECM C41 until I replaced the Memcal
with the Original with new chip..
Any idear's???
Removed the old chip from the carrier and replaced it with a new chip(National Semi NM27C256Q-100)
The numbers on the original chip were (014-045915-AD8947B).
The car runs perfect, haven't taken it for a long drive yet. Before I changed the Chip, I went to a junk yard and got a few memcal's but only off of 6cycliners.
I programed one with the original chip's code (Erased with a ultraviolet light), the car runs great and I didn't have the ECM C41 until I replaced the Memcal
with the Original with new chip..
Any idear's???
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
I'm got a ECM Code 41, (Memcal error) after changing the EPROM on the Memcal. The EPROM was failing so I copied it an programed a new chip.
Removed the old chip from the carrier and replaced it with a new chip(National Semi NM27C256Q-100)
The numbers on the original chip were (014-045915-AD8947B).
The car runs perfect, haven't taken it for a long drive yet. Before I changed the Chip, I went to a junk yard and got a few memcal's but only off of 6cycliners.
I programed one with the original chip's code (Erased with a ultraviolet light), the car runs great and I didn't have the ECM C41 until I replaced the Memcal
with the Original with new chip..
Any idear's???
Removed the old chip from the carrier and replaced it with a new chip(National Semi NM27C256Q-100)
The numbers on the original chip were (014-045915-AD8947B).
The car runs perfect, haven't taken it for a long drive yet. Before I changed the Chip, I went to a junk yard and got a few memcal's but only off of 6cycliners.
I programed one with the original chip's code (Erased with a ultraviolet light), the car runs great and I didn't have the ECM C41 until I replaced the Memcal
with the Original with new chip..
Any idear's???
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
The MEMCAL has a set of jumper wires that tell the ECM how many cylinders the engine has. If the jumpers are not configured correctly then you get the error code 41. I have seen a web site that shows how to add jumpers to convert a 6 cylinder MEMCAL to an 8 cylinder MEMCAL but I did not save the URL so I can't pass it on.
Thread Starter
Intermediate
Joined: Jan 2010
Posts: 47
Likes: 10
From: Dania Beach, Florida
I did find what pin is checked for Cylinder Select. its pin Cal56. it's label in the EPROM code is FMD 2 (Fuel Modeling Device).
Thread Starter
Intermediate
Joined: Jan 2010
Posts: 47
Likes: 10
From: Dania Beach, Florida
The MEMCAL has a set of jumper wires that tell the ECM how many cylinders the engine has. If the jumpers are not configured correctly then you get the error code 41. I have seen a web site that shows how to add jumpers to convert a 6 cylinder MEMCAL to an 8 cylinder MEMCAL but I did not save the URL so I can't pass it on.
Thread Starter
Intermediate
Joined: Jan 2010
Posts: 47
Likes: 10
From: Dania Beach, Florida
