- Preliminary Inspection

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 vacuum hoses for the following conditions:

- Correct routing
- Pinches
- Cuts
- Disconnects

^ Inspect hoses that are difficult to see beneath the air cleaner, A/C compressor, generator, etc.
^ Inspect all wires in the engine compartment for the following items:

- Proper connections
- Burned or chafed spots
- Pinched wires
- Contact with sharp edges
- Contact with hot exhaust manifolds This visual and physical inspection is very important. Preform the inspection carefully and thoroughly.

BASIC KNOWLEDGE OF TOOLS REQUIRED

CAUTION: Lack of basic knowledge of this powertrain when performing diagnostic procedures could result in incorrect diagnostic performance or damage to powertrain components. Do not attempt to diagnose a powertrain problem without this basic knowledge.

A basic understanding of hand tools is necessary in order to effectively use this information.