Where is the grid heater relay on a Cummins diesel?
Where is the grid heater relay on a Cummins diesel?
First pic is the rear of the intake horn. Second is the grid heater relay on the L fenderwell. to start with – I have power to post 1 and 2 of the relay w/ key off.
Why are my grid heater relays not working?
If they do click and the grid heaters get hot, you’re in business. Now the reason they may not be engaging is the ECM isn’t sending the signal to the relays due to temperature as discussed before or there’s a problem with the ECM. Don’t worry about that as it’s only affecting your grids which we can fire manually.
Why do I not get 12V on my grid heater?
If you don’t get 12v., put the red lead on your meter to the one that is most towards the rear of the engine and the other to ground. If you do then your ground is bad between the heater and the block. If you don’t, it might be a relay issue. Hope this helps. Okay, some more info. I believe I have a relay problem but you tell me.
Why is my intake air heater not working?
The code means that the powertrain control module has found that the input voltage reading from the intake air heater circuit is not normal when compared with the manufacturer’s guidelines. In some cases, it might take up to three drive cycle failures before the Check Engine lamp comes on.
First pic is the rear of the intake horn. Second is the grid heater relay on the L fenderwell. to start with – I have power to post 1 and 2 of the relay w/ key off.
If they do click and the grid heaters get hot, you’re in business. Now the reason they may not be engaging is the ECM isn’t sending the signal to the relays due to temperature as discussed before or there’s a problem with the ECM. Don’t worry about that as it’s only affecting your grids which we can fire manually.
If you don’t get 12v., put the red lead on your meter to the one that is most towards the rear of the engine and the other to ground. If you do then your ground is bad between the heater and the block. If you don’t, it might be a relay issue. Hope this helps. Okay, some more info. I believe I have a relay problem but you tell me.
Can a relay work on a high current heater?
Yes, a relay can sound like it’s working but not. What you need to do is google how a relay works and get pictures. Basically, a relay is a low current actuated high current switch. In other words, you can use a small current from the ECM or other source to switch a high current line.
