Visual and Physical Underhood Inspection

Perform a careful visual and physical underhood inspection when performing any diagnostic procedure or diagnosing the cause of an emission test failure. This can often lead to repairing a problem without further steps. Use the following guidelines when performing a visual and physical inspection:
^ Inspect all of the vacuum hoses for the following conditions:
- The correct routing
- Any pinches
- Any cuts
- Any disconnections
^ Inspect the hoses that are difficult to see beneath the air cleaner, the A/C compressor, the generator, etc.
^ Inspect all of the wires in the engine compartment for the following items:
- The correct connections
- Any burned or chafed spots
- Any pinched wires
- Any contact with sharp edges
- Any contact with hot exhaust manifolds

This visual and physical inspection is very important. Preform the inspection carefully and thoroughly.