DeVille V8-4.6L VIN Y (1998)
Powertrain Control Module: Initial Inspection and Diagnostic Overview
Powertrain OBD System Check
OBD SYSTEM CHECK DESCRIPTION
IMPORTANT: Understanding the table and using it correctly will reduce diagnosis time and prevent the unnecessary replacement of parts.
After the visual inspection is complete, the Powertrain OBD System Check should be performed. This Powertrain System Check will provide direction
for diagnosis of the following:
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PCM inoperative or damaged, no PCM data or SERVICE ENGINE SOON MIL inoperative.
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PCM DTCs.
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Fuel System Rich or Lean.
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Customer Complaint Driveability Symptoms. The Powertrain OBD System Check is designed as a Master table for driveability and emissions
system diagnosis. The System Check should always be used as the starting point for all Powertrain diagnosis.
The Powertrain OBD System Check is an organized approach for identifying a problem. Driver Comments normally fall into one of the following areas:
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Steady SERVICE ENGINE SOON MIL.
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Driveability problem.
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Engine will not start or stalls after start.
