Component Tests and General Diagnostics

Component Tests

Belt Tensioner-Mechanical
The only mechanical check that needs to be made is a check for tensioner "stick grab, or bind".
1. Remove the belt in the area of the tensioner.
2. Using the correct tool, rotate the tensioner from its relaxed position through its full stroke and back to the relaxed position to make sure there is no "stick, grab or bind", and to make sure that there is tension on the tensioner spring.
3. If the tensioner meets the above criteria, proceed to test the tensioner dynamically. If the tensioner does not meet the above criteria install a new tensioner.

Belt Tensioner-Dynamic
The automatic belt tensioner can be checked dynamically as follows:
1. With the engine running, observe belt tensioner movement, The tensioner should move (respond) when the air conditioning clutch cycles (if equipped), or when the engine is accelerated rapidly. If the tensioner movement is constant without air conditioning clutch cycling or engine acceleration, a pulley or shaft is probably bent, or a pulley is out of round. Excessive belt rideout (uneven depth of grooves in the belt) can cause excessive tensioner movement. Check condition by installing a new belt.
2. With the engine off, check routing of the belt.
3. Inspect the belt tensioner wear indicator to concern the belt is within operating range. Install a new belt if necessary.
4. Rotate the belt tensioner and check for a binding or seized condition. Install a new tensioner if necessary.