Inspect the belt for cracks or damage. If the belt is cracked or damaged, replace it.
Check that the position of the auto-tensioner indicator (A) is within the standard range (B) as shown. If it is out of the standard range, replace the drive belt.

Instrument Panel
This chapter describes the buttons, indicators, and gauges that are used
while driving. ...
Front Passenger's Airbag Replacement (Removal)
NOTE:
If replacing the front passenger's airbag after deployment,
refer to Component Replacement/Inspection After Deployment
for a complete list of other parts that must also be r ...
Output Shaft (Countershaft) Speed Sensor Replacement (A/T)
Remove the air cleaner assembly.
Disconnect the output shaft (countershaft) speed sensor connector, and
remove the output shaft (countershaft) speed sensor (A).
...