After refueling, turn the fuel tank cap until you hear a click. Once the cap is released, it will turn slightly in the opposite direction.

Caution
When replacing the fuel tank cap
Do not use anything but a genuine toyota fuel tank cap designed for your vehicle. Doing so may cause a fire or other incident which may result in death or serious injury.
Opening the fuel tank capValve body
Components
Disassembly
Remove shift solenoid valve slt
Remove the bolt, plate and shift solenoid valve slt
from the valve body.
Remove shift solenoid valve sl1
Remove the bolt, plate and shift solenoid valve sl1
from the valve body.
Remove shift solenoid ...
Diagnosis system
Bus check
Select "bus check" from the "obd / mobd
menu" screen.
Hint:
The ecus and sensors that are properly connected
to the can communication system can be displayed
using the intelligent tester via can vim.
Press "enter" on the intelligen ...
Inspection
Inspect cylinder head for warpage
Using a precision straightedge and feeler gauge,
measure the warpage of the contact surfaces of the
cylinder block and manifolds.
Maximum warpage:
0.08 Mm (0.0032 In.)
If the warpage is greater than the maximum, replace
the cylinder head sub-a ...