Replace it if necessary.

Inner Tube Inspection
Spring Tension InspectionWater Temperature Sensor Inspection
Remove the water temperature sensor (see Water Temperature
Sensor Removal/Installation in the Fuel System
(DFI) chapter).
Suspend the sensor [A] in a container of coolant so that
the temperature-sensing projection [C] is submerged.
Suspend an accurate thermometer [B] with temperature
...
Valve-to-Guide Clearance Measurement (Wobble Method)
If a small bore gauge is not available, inspect the valve
guide wear by measuring the valve to valve guide clearance
with the wobble method as indicated below.
Insert a new valve [A] into the guide [B] and set a dial
gauge against the stem perpendicular to it as close as
possible to the cy ...
Fluid Level Inspection
With the brake fluid reservoirs held
horizontal, the brake fluid level must
be kept between the upper and lower
level lines.
A. Front Brake Fluid Reservoir
B. Upper Level Line
C. Lower Level Line
A. Rear Brake Fluid Reservoir
B. Upper Level Line
C. Lower Level Line
If th ...