P0442 and P0456 are both evaporative emission error codes due to a small leak. The most common cause is a leaking gas cap or hose leak on that system. I did not list a code for your 0513. I am sending you a little information about your problem.. Best of Luck to you..
2003 Lexus RX300 3.0L
2003 Toyota Sienna 3.0L
2003 Toyota Highlander 3.0L, Eng Cfg V6, Eng Des 1MZFE, USA/Canada
2004 Toyota Avalon XL 3.0L
Check engine light is on with trouble codes P0442 and P0456. The codes are evaporative system small leak codes.
1. Verify that the gas cap is a factory Toyota gas cap and visually inspect that all hoses and lines are tight and connected.
2. Locate the canister closed solenoid and the vacuum switching
valve on the canister. Manually ground them and verify that they operate
and function. The canister closed solenoid is normally open and should
close when grounded. The vacuum switching valve on the canister is
normally closed and needs to open when grounded.
3. Verify that the hoses are not loose or pulled off the canister
closed valve on the air cleaner housing. This has been a common problem
on some models.
4. If no problem is found, the next step is to ground the canister
closed solenoid and the vacuum switching valve under the vehicle and
simulate an evaporative test and verify that the system holds a vacuum
and functions normally. When the solenoids are grounded, back probe the
Blue/Black (L/B) wire on the pressure sensor, and with no vacuum or
pressure, the voltage should read around 3.3 volts. Start up the vehicle
and turn on the purge vacuum switching valve and use engine vacuum to
draw down the system to around 2 volts on the pressure sensor. If the
voltage does not increase rapidly, there is no problem. If the voltage
increases quickly, look for the leak in the evaporative system.
Potential Causes:
Canister Closed Valve
Disconnected Canister Closed Valve (CCV) Hose
Gas Cap
Harness
Vacuum Switching Valve - For the pressure sensor.
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