DeVille V8-4.6L VIN Y (1998)
Powertrain Control Module: Initial Inspection and Diagnostic Overview
Visual Underhood Inspection
Inspection
One of the most important checks is a visual underhood inspection. This can often fix a problem. Inspect all vacuum hoses for pinches, cuts, or
disconnects. Inspect all the wires in the engine compartment for good connections, burned or chaffed spots, pinched wires, or contact with sharp edges or
hot exhaust manifolds. These quick tests take only a few minutes, can save you valuable time, and help you repair the problem.
All Powertrain diagnosis should begin with a thorough visual inspection. Visual inspection can often lead to repair of a simple problem without use of
the tables.
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Inspect all vacuum hoses for being pinched, cut, disconnected or misrouted. The EVAP Purge Solenoid vacuum hoses can easily be installed
incorrectly. Be sure to inspect hoses that are difficult to see such as beneath the upper intake, generator, etc.
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Check for proper ground connections, ground eyelets connected to ground points, star washers installed, if applicable.
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Check the battery positive junction block for loose retainer nuts.
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Inspect other wiring in the engine compartment for good connections, burned or chaffed spots, pinched wires or harness contact with sharp
edges or hot exhaust manifolds.
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Check for blown or missing fuses and for relays missing or installed in the wrong locations.
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Inspect plug wires for proper routing, connection, cuts, visible signs of arcing to ground.
