SAIS question (1 Viewer)

[TCEd]

My 2012 GX460 is throwing faults that imply the SAIS is the problem. I've seen the mod where you remove the internal filter and replace it with an external filter but how do you know if the filter has deteriorated and damaged things downstream ?

 

[xychromosome]

My 2012 GX460 is throwing faults that imply the SAIS is the problem. I've seen the mod where you remove the internal filter and replace it with an external filter but how do you know if the filter has deteriorated and damaged things downstream ?

If the original filter is not present or chunks are missing then that will tell you whether the fault is caused by disintegrated filter or not. You will see it as soon as you take the cover off the unit.

 

[TCEd]

If the original filter is not present or chunks are missing then that will tell you whether the fault is caused by disintegrated filter or not. You will see it as soon as you take the cover off the unit.

All I could find was some melted reside of the filter that jammed the fan. I removed the residue and the fan spins freely so I buttoned everythin up and will drive it to see if it throws anymore codes.

 

[xychromosome]

All I could find was some melted reside of the filter that jammed the fan. I removed the residue and the fan spins freely so I buttoned everythin up and will drive it to see if it throws anymore codes.

Fingers crossed that the impeding of the fan is the only issue and not something further downstream! Are you adding an external filter?

 

[Acrad]

10-13 are fixed for free under this service campaign

https://lexusgxor.com/_media/general:special_service_campaign_jlg.pdf

 

[MrTorgue]

I highly recommend the external filter path. Should help prevent issues down the line. I just did mine. Luckily my foam in there was almost new ( changed out at 70k or 90k) but I didn't want to take any chances.

 

[TCEd]

Ordered the external filter.

 

[TCEd]

10-13 are fixed for free under this service campaign

https://lexusgxor.com/_media/general:special_service_campaign_jlg.pdf

Hope I can get to dealer 150 miles away without going into limp mode.

 

[jonshonda]

Hope I can get to dealer 150 miles away without going into limp mode.

Bluetooth OBD2 reader and Torque app are your friend.

 

[TCEd]

Bluetooth OBD2 reader and Torque app are your friend.

Even if it goes into limp mode 10 miles after clearing the fault or is there a way to override the fault for the trip

 

[Acrad]

This has been reported to work on most SAIP failures...

Temporary method to get out of LIMP mode - Remove plastic cover over radiator area, disconnect electrical connector on air pump, reset existing OBD codes, CEL will be re-triggered but should keep vehicle out of LIMP mode. It has also been reported you can reset the codes while vehicle is running and that will also keep out of limp mode. One would need to do the latter workaround each vehicle trip though.

 

[TCEd]

Here is the filter residue I removed

 

[ericm979]

Hopefully the crud did not end up in the air injection system.

I need to do the filter mod on my '17.

 

[Acrad]

In that 10-13 campaign… dealer should end up basically replacing the entire system pump to air valves.

 

[TCEd]

Here is the filter residue I removed

View attachment 3314144

That filter somehow melted and became a somewhat hard chunk which seized the fan below and also restricted the air passage, I was able to pop it free in one piece and remove it. What caused the filter to melt ? This is on a 2012 460 with only 67,000 miles. I'll run it a lot and see if it goes into limp mode or not. Somehow I'll get it to the dealer later next week.

 

[Acrad]

Have you had your 460 in any water? It is usually caused by that foam getting wet and then it gets pulled down into the fan impeller.

 

[TCEd]

Have you had your 460 in any water? It is usually caused by that foam getting wet and then it gets pulled down into the fan impeller.

No water except the car wash ! We did have a couple of really hard horizontal wind driven snows this winter.

 

[r2m]

This has been reported to work on most SAIP failures...

Temporary method to get out of LIMP mode - Remove plastic cover over radiator area, disconnect electrical connector on air pump, reset existing OBD codes, CEL will be re-triggered but should keep vehicle out of LIMP mode. It has also been reported you can reset the codes while vehicle is running and that will also keep out of limp mode. One would need to do the latter workaround each vehicle trip though.

Reset each vehicle trip? Or every time the vehicle is started after being completely turned off?

 

[MrTorgue]

Here is the filter residue I removed

View attachment 3314144

You got lucky...

 

[Acrad]

Reset each vehicle trip? Or every time the vehicle is started after being completely turned off?

The disconnected air pump is going to be detected each time so would need to be reset every restart of the vehicle.

If you want to take failure out of the equation over the long term...one may want to look at a Hewitt. The valves can still fail in the system even without ingestion of debris from the air pump.

Hewitt-Tech Gen 2: Secondary Air Injection System Bypass Kit (Plug & Play)

Gen 2 (Plug & Play) SAIS Bypass Kit is compatible with most Toyota / Lexus Trucks & SUVs. It enables you to clear the Check Engine Light, Limp Mode and error codes related to both mechanical and electrical SAIS faults. P0412 P0415 P0418 P0419 P1441 P1442 P1444 P1445 P2440 P2441 P2442 P2443 P2445...

hewitt-tech.com