1993 code 51 problem
Pro
Joined: Jan 2009
Posts: 686
Likes: 4
From: Austin Texas
Do you live near Area 51 ?
Melting Slicks
Joined: Jan 2008
Posts: 2,054
Likes: 120
From: AZ
this may help. http://chevythunder.com/199295_lt1_trouble_codes.htm
Why did you change the ECM and PROM originally? Seems you got some bad electronics there, throwing PROM faults.
Why did you change the ECM and PROM originally? Seems you got some bad electronics there, throwing PROM faults.
Melting Slicks
Joined: Aug 1999
Posts: 2,240
Likes: 41
From: Baltimore, MD USA
Are you sure it's an ECM error code and not a CCM error code?
SYS flashing in the LCD would indicated a CCM 51 which is a problem reading the key pellet. Usually a dirty/worn key pellet or bad ignition key cylinder.
Service Engine Soon lamp on with a DTC 51 would indicated a ECM eprom or ECM problem.
What method are you using to pull codes. If via the CCM by shorting pin A to Pin G, Module 1 are codes for the CCM and Module 4 are codes for the ECM.
SYS flashing in the LCD would indicated a CCM 51 which is a problem reading the key pellet. Usually a dirty/worn key pellet or bad ignition key cylinder.
Service Engine Soon lamp on with a DTC 51 would indicated a ECM eprom or ECM problem.
What method are you using to pull codes. If via the CCM by shorting pin A to Pin G, Module 1 are codes for the CCM and Module 4 are codes for the ECM.
Last edited by Hooked on Vettes; Jun 24, 2009 at 03:11 PM.
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Thread Starter
Cruising
Joined: Jun 2009
Posts: 10
Likes: 0
From: san antonio tx
I bought a new prom from GM ,runs good ,just gives service eng. soon light, i check the codes and it's a dtc 51,turn it off and restart light is out,you can drive for a mile or 20 miles all sudden the ser. eng. lights up no pattern to it .
