W 3500 L4-5.2L DSL Turbo (2006)
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The MIL illuminates when the ignition switch is turned ON, with the engine OFF. This is a bulb test to ensure the MIL is able to illuminate.
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The MIL turns OFF after the engine is started if a diagnostic fault is not present.
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The MIL remains illuminated after the engine is started if the engine control module (ECM) detects a fault. A diagnostic trouble code (DTC) is
stored any time the ECM illuminates the MIL due to an emission related fault.
Service Vehicle Soon (SVS) Lamp Operation [12.000lbs GVW]
The service vehicle soon (SVS) lamp is located in the instrument panel cluster. The SVS lamp will display the following symbol when commanded ON:
The SVS lamp indicates that a non-emission related fault (Type C DTC) has occurred and vehicle service required. The following is a list of the modes
of operation for the SVS lamp (Only 12,000 GVW):
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The SVS lamp illuminates when the ignition switch is turned ON, with the engine OFF. This is a bulb test to ensure the SVS lamp is able to
illuminate.
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The SVS lamp turns OFF after the engine is started if a diagnostic fault is not present.
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The SVS lamp remains illuminated after the engine is started if the engine control module (ECM) detects a fault. A diagnostic trouble code (DTC)
is stored any time the ECM illuminates the SVS lamp due to a non-emission related fault.
