Jump to content
  • Welcome To Mopar1973Man.Com

    We can see you are lurking about reading the forums and article databases. We happen to be one of the most friendliest Cummins support website on the planet. Come on and register and grab a inexpensive subscription plan. With that you can unlock even more for you. Technical support either by public forum, private support ticket, and even unlock phone support by Mopar1973Man. Mopar1973Man.Com will remain FREE to read forever!

Recommended Posts

Hey guys, so my truck will go into o/d when the temps are cool. I’m refraining from saying “cold” because it doesn’t ever get cold where I am. Relative to most of the world. Haha

 

once my trans temp gets up around 100 deg F my pcm doesn’t send the ground signal to engage o/d. It will hold as long as I’m in it, but once disengaged it will not re engage as long as trans temps are above 100 deg. 
 

I checked the resistance that the temp sensor is sending to the pcm and it is accurate, as long as the key is off or the pcm is unplugged. As soon as I plug it in or turn the key on I lose about 400ohms resistance. Idk why. Plz help. 
 

I got a reman pcm from Chrysler and it’s not very old. I’ve tried running a resistor in-line the sendor wire but idk if I didn it right because it didn’t yield good results. 
 

 

plz help. This truck has been a tough fighter. Haha

Link to post
Share on other sites

You can't check resistance on an active circuit. You'll get all kinds of useless readings. You're going to want to check voltage with the circuit active. Check for voltage on the signal side of the sensor. It will change with temperature.

 

You shouldn't have any resistors in the circuit. You can check for voltage on the ground side (PCM side) of the OD solenoid. It should read battery voltage until the PCM commands the solenoid on. At that point, it will drop to zero (or near zero) voltage.

  • Like 1
Link to post
Share on other sites
×
×
  • Create New...