[1994LiftedRam1500]

I have a 1994 Dodge Ram 1500 with the 318. My question is about the ECM vs the PCM and where the location of these two are located on the truck?

I've seen diagrams and I think that the PCM (located on passenger side of the truck under the hood next to my AC lines, if I'm correct) has gotten wet due to the condesation from my AC lines. Since then the truck has been randomly stalling on me and sometimes the RPM's will just drop and act like it wants to stall, but then they shoot right back up and let me continue driving. It's happened quite often in the past few days, but I noticed since I've left the AC turned off, I haven't really had a problem.

Can someone please tell me what the locations of the ECM and PCM are and what I might be able to do about this problem?

No check engine light, oil pressure is fine, and it's not overheating. Please help!!!

 

[Saltillo Express]

Crystal River. I'm in Apopka.

that IS the PCM on the firewall. Some call it the ECU. But a little condensation from the AC lines is not doing that. Chances are you got a IAC sensor or TP Sensor starting to act up on the throttle body. Both of those help control the idle and stalling will be the first clue when they go out.

I would drop by an auto parts store and ask them to scan it for codes. Even though you don't have a light on - it still might set a code for those two sensors. Both are cheap and easy to replace.

If it was at all the PCM (or ECU if you will) it would be setting a code and light for that.

 

[Warlock III]

Crystal River. I'm in Apopka.

that IS the PCM on the firewall. Some call it the ECU. But a little condensation from the AC lines is not doing that. Chances are you got a IAC sensor or TP Sensor starting to act up on the throttle body. Both of those help control the idle and stalling will be the first clue when they go out.

I would drop by an auto parts store and ask them to scan it for codes. Even though you don't have a light on - it still might set a code for those two sensors. Both are cheap and easy to replace.

If it was at all the PCM (or ECU if you will) it would be setting a code and light for that.

Actually it depends on the year of the vehicle. I agree that they should all be called the same thing.


ECM= Electronic Control Module/Engine Control Module.
PCM= Power Control Module/Power-train Control Module.
TIPM= Totally Integrated Power Module.

 

[Bmccarrell]

94 Ram issues

I have a 94 Ram 2500 4x4, 5.9L automatic, truck was starting sometimes, but quit and then run for a while, replaced coil, seems like relays were problem, to no avail, replaced ecm, now truck wont start, throwing a 1 1 code, after a 3 3 code, Distributor??