Howling sound

Please post your Vehicle Identification Number (VIN) for proper diagnostic from the TSB.

this guide can help

https://www.2carpros.com/articles/car-howling-noise

MIL ON DTC P0440, P0441 OR P0446

Reference Number(s): EG013-03, Â Date of Issue: Â September 29, 2003
TOYOTA:2000 - 03 Avalon, Camry & Solara; 2001 - 03 Sienna
SECTION:Engine Related Ref Number(s): EG013-03

Under certain driving conditions, some 2000 - 2003 model year Avalon, Camry (NAP only) and Solara vehicles, and some 2001 - 2003 model year Sienna vehicles may exhibit a M.I.L. "ON" with DTC(s) P0440, P0441 and/or P0446 stored due to an inoperative Canister Closed Valve Vacuum Switching Valve (CCV VSV).

Applicable Warranty
This repair is covered under the Toyota Federal Emissions Warranty. This warranty is in effect for 36 months or 36,000 miles, whichever occurs first, from the vehicle's in-service date. For California, Massachusetts, Maine and Vermont, the Toyota Federal Emissions Warranty is in effect for 36 months or 50,000 miles, whichever occurs first, from the vehicle's in-service date.

***I will email to the entire TSB***
The warranty has expired, but you may wish to call on your local dealership. They may perform the work under good faith.

Hi
Both codes indicate faulty Evap Pressure switching valveVSV located near tank at charcoal canister see diagram

Did "howling stop"?

The code you don't want to see is a P0442. This indicates the system has detected a SMALL leak, but small leaks can often be a BIG problem to find. By small, we mean a leak no larger than a pin prick! Such small leaks are virtually impossible to find visually, so a special tester called a smoke machine is usually necessary to reveal the leak. The smoke machine feeds a mineral-oil based vapor into the EVAP system under light pressure (no more than a few pounds per square inch). The smoke may also contain an ultraviolet dye to make it easier to see under UV light.

Fixing EVAP codes can be a challenge, even for professional technicians. And if you have a P0442 small leak code, you'll probably have to take your car to a repair shop that has a smoke machine.

Incorrect purge flow and vent control circuit-Check for a faulty purge control flow solenoid or a venting solenoid, and also check for inop. VSV between engine and canister

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Hi 71elky4fun,

It could be some vacumn valve leaking, most likely vacumn related as it disappears at higher rpm. Brake booster, PCV or air cleaner hhoses.