If they appear damaged or deteriorated, replace them.

Balancer Adjustment
Torque LimiterCamshaft, Camshaft Cap Wear Inspection
Remove the camshaft caps (see Camshaft Removal).
Cut the strips of plastigage (press gauge) to journal width.
Place a strip on each journal parallel to the camshaft installed
in the correct position.
Tighten the camshaft cap bolts and upper camshaft chain
guide bolts to the specified ...
Exhaust Butterfly Valve Actuator Installation
Install the pulley [A] on the actuator so that the hole side
[B] align with the groove [C] on the shaft.
Make sure that the groove on the shaft is pointing toward
the center of the screw [D].
If the shaft position is incorrect, refer to the following
NOTE and procedures to electrically ad ...
Check 3-1: CAN Communication Line Resistance Inspection
Set the hand tester [A] to the ×1 Ω range and connect it
to the terminal [11] and [12] in the meter unit.
Special Tool - Hand Tester: 57001-1394
CAN Communication Line Resistance (at Meter Unit)
Standard: 122 126 Ω
If the tester reading is not specified, replace the meter ...