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Grid Heater

TFaoro
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TFaoro

TFaoro

Posted
Posted

So my grid heater ALWAYS comes on when I start the truck. It doesn't matter whether the engine is warm, ambient is warm, etc.

Example today:

78* ambient temp

Engine temp 180

Intake air temp 175

Charging voltage (once moving and grids shut off) 13.6V.

The lower charging tells me the battery temp sensor knows it's warm out, so that's pretty much ruled out. Is the ECM just mad because it can't see a VP??

notlimah

notlimah

Posted
Posted

Hmm, have you gone through and checked the steps HERE. Mainly the resistance at the different areas it says. I did mine a while ago and found my grid heater out of specs so I replaced it.

TFaoro

TFaoro

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1 hour ago, notlimah said:

Hmm, have you gone through and checked the steps HERE. Mainly the resistance at the different areas it says. I did mine a while ago and found my grid heater out of specs so I replaced it.

Those all seem to be "not working" issues. Whether the grid heater is out of spec or not, it should still kick on at the correct times. 

 

1 hour ago, Dieselfuture said:

Does it do it even with IAT fooled to 143f?

I don't have an IAT fooler anymore, but earlier today it was plenty hot to not need it. 

 

The grids aren't coming on when I first kick the key on, but after the engine has started. With the AC and grids kicking on my idle is dropping by 100+rpms :lol: 

As if it isn't a pita enough to get going how it is. 

notlimah

notlimah

Posted
Posted

I was just thinking along the line of if part of the system is out of spec, could be causing unforeseen issues in the rest of the system. Does it ever turn off? 

 

Have you checked the smaller wires that connect the ecm to the relays? Might be loose or dirty? Otherwise I might just be because of your ppump. :think:

 

Was it doing it prior? Any codes?

TFaoro

TFaoro

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Posted
12 hours ago, notlimah said:

I was just thinking along the line of if part of the system is out of spec, could be causing unforeseen issues in the rest of the system. Does it ever turn off? 

 

Have you checked the smaller wires that connect the ecm to the relays? Might be loose or dirty? Otherwise I might just be because of your ppump. :think:

 

Was it doing it prior? Any codes?

Yeah, it cycles like normal when the battery is cold... except the batteries are hot. 

Small wires are all good and the relays were replaced a couple months ago. 

It wasn't doing it before the swap. I do have an array of codes, but none of them point at the grids. 

 

54 minutes ago, jlbayes said:

Hrm....I haven't hooked my grids back up yet but my 12v ALWAYS seems to cycle the grids even above the temp threshold. 

Hooke em up!!

That's weird on the 12v. Sounds like a sensor might not be working right. 

jlbayes

jlbayes

Posted
Posted

It is like the pcm cycles them for a bit and then shuts them off. It is temp based though as it will vary how long it keeps them on. On greeny I have to change where the relays were mounted. Intercooler pipes in the way.

notlimah

notlimah

Posted
Posted

Seems like maybe it's a normal thing for them to cycle regardless of temp for a quick bit then once temp starts reading correctly (or above 60*) then they shut off?? I'll check mine once I leave work and see if it does it. 

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Mopar1973Man

Mopar1973Man

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On 4/25/2017 at 7:59 AM, jlbayes said:

They are temp based and only should cycle when needed. How they are supposed to work any way.

 

Most believe its base on IAT temperature which is partial true the other half of the temperature comes from the battery temperature sensor under the driver side battery. With my IAT fooler on and showing 143*F I should not get any grid heater and with ECT at 190-200*F. Still in all the grid heater will still fire post starting this is because the battery temperature is below 60*F and will be used in part of the calculation.

TFaoro

TFaoro

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On 4/26/2017 at 9:04 AM, Mopar1973Man said:

 

Most believe its base on IAT temperature which is partial true the other half of the temperature comes from the battery temperature sensor under the driver side battery. With my IAT fooler on and showing 143*F I should not get any grid heater and with ECT at 190-200*F. Still in all the grid heater will still fire post starting this is because the battery temperature is below 60*F and will be used in part of the calculation.

Not sure how I missed your post....

Any thoughts on why mine is kicking on when everything is warm?? (IAT, ECT, and Batteries)

TFaoro

TFaoro

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8 hours ago, Mopar1973Man said:

IAT and Battery temp are the two sensors that control grid heaters. The only tool I know of that reads Battery Temp is @Chris O. CCD tool I know @Me78569 has his and could validate the battery temp sensor for you. 

I'll have to try and catch @Me78569 the next time I'm coming through CO Springs. Hopefully Friday. 

You free Nick?? You need to drive this thing anyway. 

jlbayes

jlbayes

Posted
Posted
On 4/26/2017 at 11:04 AM, Mopar1973Man said:

 

Most believe its base on IAT temperature which is partial true the other half of the temperature comes from the battery temperature sensor under the driver side battery. With my IAT fooler on and showing 143*F I should not get any grid heater and with ECT at 190-200*F. Still in all the grid heater will still fire post starting this is because the battery temperature is below 60*F and will be used in part of the calculation.

 

I'll bust out the verus this weekend and see if the battery temp sensor is messing with mine. After I pull this tcase.....

TFaoro

TFaoro

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Posted
On 5/2/2017 at 6:45 AM, Mopar1973Man said:

 

Yon need to bring it out to the camp out in August so I get a least a ride in your beast...

I'll have to throw it on a trailer and have Nick tow it out there :lol: 

On 5/2/2017 at 3:09 PM, Dieselfuture said:

By then he'll probably have a jet engine in there:shrug:

1 step at a time! 6.7 is probably next....

12 hours ago, jlbayes said:

 

I'll bust out the verus this weekend and see if the battery temp sensor is messing with mine. After I pull this tcase.....

:popcorn::party:

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