Silverado 3500 2WD V8-6.6L DSL Turbo VIN 2 (2004)
The MIL indicates that an emissions related fault has occurred and vehicle service is required.
The following is a list of the modes of operation for the MIL:
-
The MIL illuminates when the ignition is turned ON, with the engine OFF. This is a bulb test to ensure the MIL is able to illuminate.
-
The MIL turns OFF after the engine is started if a diagnostic fault is not present.
-
The MIL remains illuminated after the engine is started if the control module detects a fault. A diagnostic trouble code (DTC) is stored any time
the control module illuminates the MIL due to an emissions related fault. The MIL turns OFF after three consecutive ignition cycles in which a
Test Passed has been reported for the diagnostic test that originally caused the MIL to illuminate.
-
The MIL flashes if the control module detects a misfire condition which could damage the catalytic converter.
-
When the MIL is illuminated and the engine stalls, the MIL will remain illuminated as long as the ignition is ON.
-
When the MIL is not illuminated and the engine stalls, the MIL will not illuminate until the ignition is cycled OFF and then ON.
Aftermarket (Add-On) Electrical And Vacuum Equipment
Any equipment installed on a vehicle after leaving the factory that connects to the electrical or vacuum systems of the vehicle defines aftermarket
(Add-On) electrical and vacuum equipment. The vehicle design makes no allowances for this type of equipment.
NOTE:
-
Do not attach add-on vacuum operated equipment to this vehicle. The use of add-on vacuum equipment may result in damage to vehicle
components or systems.
-
Connect any add-on electrically operated equipment to the vehicle's electrical system at the battery (power and ground) in order to prevent damage
to the vehicle.
The add-on electrical equipment, even when installed to these strict guidelines, may still cause the powertrain system to malfunction. This may also
include any equipment which is not connected to the electrical system of the vehicle such as portable telephones and radios. Therefore, the first step in
diagnosing any powertrain problem is to eliminate all of the aftermarket electrical equipment from the vehicle. After this is done, if the problem still
exists, diagnose the problem in the normal manner.
Computers and Control Systems Information
The driveability and emissions information describes the function and operation of the control module. The emphasis is placed on the diagnosis and
repair of problems related to the system.
Engine Components, Wiring Diagrams, and Diagnostic Trouble Code (DTC) tables:
-
The Component Locations
-
The Wiring Diagrams
-
The Control Module Terminal End View and Terminal Definitions
-
The Diagnostic System Check - Computers and Control Systems
-
The Diagnostic Trouble Code (DTC) tables
The Component System includes the following items:
-
The component and circuit description
-
The On-vehicle service for each subsystem
-
The Functional checks with the diagnostic tables
-
How To Use Electrical Systems Diagnostic Information
The DTCs also contain the diagnostic support information containing the circuit or the system information, and helpful diagnostic information.
Wiring Harness Service
The control module harness electrically connects the control module to the various solenoids, switches, and sensors in the vehicle engine compartment
and passenger compartment.
