If they appear damaged or deteriorated, replace them.

Balancer Adjustment
Torque LimiterIdle Speed Control Valve Actuator Resistance Inspection
Turn the ignition switch to OFF.
Remove the air cleaner housing (see Air Cleaner Housing
Removal in the Fuel System (DFI) chapter).
Disconnect the idle speed control valve actuator connector
[A].
Connect a digital meter to the idle speed control valve
actuator connector [A]
...
Location of labels
All warning labels which are on your
vehicle are repeated here. Read labels
on your vehicle and understand them
thoroughly. They contain information
which is important for your safety and
the safety of anyone else who may operate
your vehicle. Therefore, it is very
important that all warning ...
Crankshaft Sensor Peak Voltage Inspection
NOTE
Be sure the battery is fully charged.
Using the peak voltage adapter [A] is more reliable way
to determine the condition of the crankshaft sensor than
crankshaft sensor internal resistance measurements.
Disconnect the crankshaft sensor lead connector (see
Crankshaft Sensor ...