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How does the air filter monitor work?

GN2018
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GN2018 Enthusiast

GN2018

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I changed the air filter at 25K miles about a year and a half ago.  I was clicking through the information screen today and noticed the monitor was at 100%.  I'm at 39K miles now.  Does it make any sense that the monitor would still show 100%?  I'm thinking someone reset it when doing an oil change.  Maybe they do that to say they checked it and it looks okay????  I guess it doesn't matter because I'll change it on miles but I'm just wondering if I'm missing something.  I'll probably change it at 50K.  Unbelievable that the recommendation in the Severe maintenance schedule is 4 years if the monitor doesn't go off or an inspection doesn't show signs of needing it replaced.

 

redwngr Senior Enthusiast

redwngr

Posted
Posted

I think it detects the vacuum between the filter and intake or pressure drop across filter.

Either way, the higher the blockage, the higher the vacuum or larger the pressure drop.

 

At 14,000 miles since change it would seem likely that there is at least a little extra restriction.

I'd be checking for any leaks around or after the filter. 

 

 

(Old school filter minders just measured the vacuum on engine side of the filter)

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newdude Senior Enthusiast

newdude

Posted
Posted (edited)
14 hours ago, GN2018 said:

I changed the air filter at 25K miles about a year and a half ago.  I was clicking through the information screen today and noticed the monitor was at 100%.  I'm at 39K miles now.  Does it make any sense that the monitor would still show 100%?  I'm thinking someone reset it when doing an oil change.  Maybe they do that to say they checked it and it looks okay????  I guess it doesn't matter because I'll change it on miles but I'm just wondering if I'm missing something.  I'll probably change it at 50K.  Unbelievable that the recommendation in the Severe maintenance schedule is 4 years if the monitor doesn't go off or an inspection doesn't show signs of needing it replaced.

 

 

1 hour ago, redwngr said:

I think it detects the vacuum between the filter and intake or pressure drop across filter.

Either way, the higher the blockage, the higher the vacuum or larger the pressure drop.

 

At 14,000 miles since change it would seem likely that there is at least a little extra restriction.

I'd be checking for any leaks around or after the filter. 

 

 

(Old school filter minders just measured the vacuum on engine side of the filter)

 

 

Seems to work like the GM Oil Life Monitor system, best I can read from the description and operation.

 

 

When to Change Engine Air Filter

 

If equipped, this feature provides an indication of when to change the engine air filter. It is based on driving conditions, which can cause when to change, and can vary greatly. It is possible an air filter change may not be indicated for up to four years.

 

Replace the engine air filter when the REPLACE NOW message displays on the Driver Information Center (DIC). This should be done as soon as possible within the next 600 miles (1,000 km). The system must be reset after the engine air filter is changed.

 

When a REPLACE AT NEXT OIL CHANGE message displays, this indicates that the engine air filter change is necessary at the next engine oil change.

 

Air Cleaner Monitor Setup

For an overview of the component/system, refer to: Owner's manual

 

The Air Cleaner Monitor Setup is used to inform the driver when the next service interval is required. The Air Cleaner Monitor displays the Air Cleaner Life Remaining as a percentage. The Air Cleaner Monitor Setup can be used to Disable/Enable the monitor and Reset the Air Cleaner Life Remaining percentage.

 

The control module K20 monitors the following:

  • Air Cleaner Monitor Test Result
  • Ambient Air Temperature
  • Distance Traveled
  • Engine Coolant Temperature
  • Engine Load
  • Engine Speed
  • Humidity Sensor Intake Air Temperature Signal
  • Time Since Last Service Interval Reset
  • Total Mass Air Flow
  • Vehicle Speed

 

If maintenance is required a message will be activated via serial data@ P16 Instrument Cluster — P9 Driver Information Center Display

 

This procedure resets the control module learned values of the component/system: Air Cleaner Monitor

Edited by newdude
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redwngr Senior Enthusiast

redwngr

Posted
Posted (edited)

Thanks @newdude

Didn't know they changed it to a predictive system.

 

Sucks in my opinion.

Predictive doesn't know if the vehicle is frequently running in dusty environments or is 'never' win dusty environments.

 

 

Did they do that with fuel filters too -- on 3.0 or 6.6 Duramax? 

 

 

I (think I ) understand using predictive for oil life but not for air and diesel fuel filters

Edited by redwngr
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silveradosid Senior Enthusiast

silveradosid

Posted
Posted

i wouldn't say perdictive as per say "Total mass air flow" the mass air flow off the filter is being monitored, so if the flow is 4gs on a new filter , as the filter get dirty and drops to 3.95 the ecm  is detecting the difference of the air flow. using distance tr avelled and rpm's it can determine the rate at which the filter will need changed. so if you do drive in dusty conditions the  ecm still know by how fast the filter degrades

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