Remaned PCMs
Legend
Joined: Apr 2006
Posts: 9,112
Likes: 1
From: Spring, TX
RE: Remaned PCMs
Good info from another site...the .org
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ORIGINAL: Rick '99 Flame Red R/T
IIRC; the different PCM's
1995 Automatic Trans SOHC (ATX) (PCM controls the Torque Converter Lock-Up)
1995 Manual Trans SOHC(MTX)
1995 Automatic Trans DOHC (ATX) (PCM controls the Torque Converter Lock-Up)
1995 Manual Trans DOHC(MTX)
All 1995 PCM's are pre-OBDII and are different shape/size and connectors.
1996 ATX SOHC
1996 MTX SOHC
1996 ATX DOHC
1996 MTX DOHC
Now OBDII the same shape/size/connectors as the later 1st Gen Neons. Again, the ATX version controlled the TC lock-up. The 1996 version operated the fans a different way than the 97-99, as well the pin that connects to the fans is different. So swapping between '96 and '97-'99 you have to work out fan problems.
'97-'99 ATX SOHC
'97-'99 MTX SOHC
'97-'99 ATX DOHC
'97-'99 MTX DOHC
Again, the ATX version controlls the lock-up of the TC for the trans.
Air Con, are as we abreviate here, AC, is built into all the PCM's so even if the donor car doesn't have it, it should work with the PCM in your car.
Programming in VIN and Mileage is not necessary, I have swapped in several Mopar Performance PCM's and back and forth with my OEM PCM and never had any VIN or mileage flashed and never got a code. 2nd Gen PCM's have a security function that disables the car, it talks with the body computer to do it, and these DO NEED to be flashed with the VIN and Mileage or they will shut down and won't start the car. The 1st Gen Neons don't have a body computer.
'95 PCM's won't work in later 1st Gens, they won't even hook up.
Swapping between '96 and '97-'99 PCM/Cars will work, but the radiator fans won't work, you have to swap over the fans relays and re-work the wiring to get the fan/fans working if you swap between these models.
Swapping between SOHC and DOHC PCM's work, but you get more power from the PCM optimized for you particular engine. Some people like the DOHC PCM in a SOHC car because of the higher rev limiter, which could give you a little more performance. As well the above rules about the different years apply.
Swapping around ATX and MTX PCM will work, BUT if you swap a MTX PCM in an ATX equipped car, there will be no TC lock-up, the trans will fill sluggish during cruise, mileage will go down and trans heat will go way up, without an extra cooler, the trans will probably burn up. Putting an ATX PCM in a MTX equipped car shouldn't be a problem, except ATX PCM isn't optimized for MTX car. Like between a SOHC/DOHC, the PCM will run the motor, but it was optimized for a particular combination and might not make as much power as if you used the proper PCM. As well the above rules apply as well.
In your case, swapping a '96 PCM into a '98 Car, with the same Motor/Trans Combo. You won't have any problems with the options, like AC, but you will have a problem with the radiator fans, they won't work. Your going to have to swap around a pin on the connector for the PCM, the later model relay should work with the earlier PCM (it doesn't the other way around) but don't be surprised if the relay fails early, then I would splice in the much cheaper old style relay.
The '96 and earlier Neons operated the fan with a simple electro-mechanical relay, turned the fan on or off 100% as needed. '97 and later Neons used Pulse Width Modulation (PWM) to control the motor/fan speed and turn the fan on/off or any percentage of desired speed inbetween as necessary. To do this it needed a Solid State Relay, which is basically a huge HD MOSFET Transistor. It costs about $100 U.S. but it almost never fails, which the old cheap mechanical relay often failed.
IIRC; the different PCM's
1995 Automatic Trans SOHC (ATX) (PCM controls the Torque Converter Lock-Up)
1995 Manual Trans SOHC(MTX)
1995 Automatic Trans DOHC (ATX) (PCM controls the Torque Converter Lock-Up)
1995 Manual Trans DOHC(MTX)
All 1995 PCM's are pre-OBDII and are different shape/size and connectors.
1996 ATX SOHC
1996 MTX SOHC
1996 ATX DOHC
1996 MTX DOHC
Now OBDII the same shape/size/connectors as the later 1st Gen Neons. Again, the ATX version controlled the TC lock-up. The 1996 version operated the fans a different way than the 97-99, as well the pin that connects to the fans is different. So swapping between '96 and '97-'99 you have to work out fan problems.
'97-'99 ATX SOHC
'97-'99 MTX SOHC
'97-'99 ATX DOHC
'97-'99 MTX DOHC
Again, the ATX version controlls the lock-up of the TC for the trans.
Air Con, are as we abreviate here, AC, is built into all the PCM's so even if the donor car doesn't have it, it should work with the PCM in your car.
Programming in VIN and Mileage is not necessary, I have swapped in several Mopar Performance PCM's and back and forth with my OEM PCM and never had any VIN or mileage flashed and never got a code. 2nd Gen PCM's have a security function that disables the car, it talks with the body computer to do it, and these DO NEED to be flashed with the VIN and Mileage or they will shut down and won't start the car. The 1st Gen Neons don't have a body computer.
'95 PCM's won't work in later 1st Gens, they won't even hook up.
Swapping between '96 and '97-'99 PCM/Cars will work, but the radiator fans won't work, you have to swap over the fans relays and re-work the wiring to get the fan/fans working if you swap between these models.
Swapping between SOHC and DOHC PCM's work, but you get more power from the PCM optimized for you particular engine. Some people like the DOHC PCM in a SOHC car because of the higher rev limiter, which could give you a little more performance. As well the above rules about the different years apply.
Swapping around ATX and MTX PCM will work, BUT if you swap a MTX PCM in an ATX equipped car, there will be no TC lock-up, the trans will fill sluggish during cruise, mileage will go down and trans heat will go way up, without an extra cooler, the trans will probably burn up. Putting an ATX PCM in a MTX equipped car shouldn't be a problem, except ATX PCM isn't optimized for MTX car. Like between a SOHC/DOHC, the PCM will run the motor, but it was optimized for a particular combination and might not make as much power as if you used the proper PCM. As well the above rules apply as well.
In your case, swapping a '96 PCM into a '98 Car, with the same Motor/Trans Combo. You won't have any problems with the options, like AC, but you will have a problem with the radiator fans, they won't work. Your going to have to swap around a pin on the connector for the PCM, the later model relay should work with the earlier PCM (it doesn't the other way around) but don't be surprised if the relay fails early, then I would splice in the much cheaper old style relay.
The '96 and earlier Neons operated the fan with a simple electro-mechanical relay, turned the fan on or off 100% as needed. '97 and later Neons used Pulse Width Modulation (PWM) to control the motor/fan speed and turn the fan on/off or any percentage of desired speed inbetween as necessary. To do this it needed a Solid State Relay, which is basically a huge HD MOSFET Transistor. It costs about $100 U.S. but it almost never fails, which the old cheap mechanical relay often failed.
