Engine/Transmission (1994 - 1998) Resistor @ PCM ??

[Dave Remillard]

I recall reading some time ago about the need to add a resistor at the PCM after transmission and TC modifications (I think), but don'r recall what the reasoning is. I've done a search, but apparently did not use the correct key search criteria. Can anyone refresh my memory on this one?

 

[phoekema]

resister added

I had to do this on my 98. 5 after installing the ATS triple lock converter and valve body. The truck drove fine in town and actually on the highway too UNTIL I stoped after a high speed (60-70mph) run. Then the computer would be in limp in mode and wouldn't start in first gear. You could reset everything by simply turning off the engine and restarting it. Until the next highway run, it would be fine.

When I called Don at ATS, he suggested I get the codes and call him back (ATS didn't install my converter and valve body, but I had it done at a local transmission shop). With the codes (too high a governor pressure, I believe) he knew what had to be done and even offered to pay what it would cost for me do have it done. Because I have done a lot of electronic type of work, I just took care of it myself. It involved installing a 100 ohm resister between one of the pins behind the air cleaner and the harness - a simple fix and it took care of the problem permanently.

Don't confuse this with the stock transmission limp in problem which is corrected by a reflash. I had this too while on a trip pulling my 5th wheel. First time it happened it scarred the *&^# out of me - though my transmission was a gonner! The temporary cure on that was the same - turn off engine and restart. The reflash was the permanent cure.

If you need to know to what pin the resistor was added, give Don at ATS a call, or otherwise I can find out for you as well.

Hope this answers your question.

 

[Stefan Kondolay]

Unfortunately some of the assistance you may receive while well meaning can prove quite costly and or time consuming if given without transmission expertise.



In this case it would prove quite fruitless in your condition. As noted by your signature you have a 1995 Dodge ram. You do not have an electronic governor you have a mechanical governor so the above advice does not apply to you.



1995 and earlier Dodge rams do not require a resistor .

1996 + dodge rams have electronic governor which do require the resistor on pin # 31 in some cases.



The resistor is used to fool the pcm into thinking you have factory pressures. The value of the resistor varies from one truck to the next. It can also vary after a given amount of time. At DTT most of our trucks are equiped with a variable voltage regulator instead of a resistor.

 

[Dave Remillard]

Thanks!!

 

[phoekema]

Doesn't apply

Unfortunately I did not read as closely as I should have. Stefan is correct in that this particular fix, while just what the Dr. ordered for my 98. 5, does not apply to your 95. I should have read a bit more carefully.