Jump to content
Mopar1973Man.Com LLC

  • Welcome To Mopar1973Man.Com LLC

    We are a privately owned support forum for the Dodge Ram Cummins Diesels. All information is free to read for everyone. To interact or ask questions you must have a subscription plan to enable all other features beyond reading. Please go over to the Subscription Page and pick out a plan that fits you best. At any time you wish to cancel the subscription please go back over to the Subscription Page and hit the Cancel button and your subscription will be stopped. All subscriptions are auto-renewing. 

intake heater relays don't work

seiauto
 Share

Recommended Posts

seiauto

seiauto

Posted
Posted

So far i have check the following: 1.-check the relay it self by manually appling voltage and they work. 2.- confirm that the grownd side of the relay coil is not open 3.- At the connector comming from the ECM there is no voltage when set the ignition switch on Am I looking into a defective ecm?

Link to comment
Share on other sites
  • Owner
Mopar1973Man

Mopar1973Man

Posted
  • Owner
Posted

Another missing step... 4. What is the reported IAT temperature from the ECM? If the IAT sensor is bad and reporting unnormally high temperature then the grid heater are cancelled completely. I've seen one other report where a owner was seeing with a live data tool the IAT temp was 120*F on a -20*F morning... Of course the ECM takes this value and processes accordingly and not use the grid heaters. Like on my truck with the MPG fooler on my IAT is set permanently at 140*F and my grid heater are disabled... :smart:

Link to comment
Share on other sites
seiauto

seiauto

Posted
  • Author
Posted

Michael.. You were right, I confirm the proper operation this morning and the relay work ok, one thing i found was one of the coil relay conectors (comming from ecm) was loose so i crimp it with a pair of pliers and make the it fit in tight and problems was solve (i guess the p code was cause by a miss contact on this conector.

Link to comment
Share on other sites
 Share
Go to topic listing
×
×
  • Create New...