GMC Sierra 3500HD 2001 Owner's Manual page 271

Short Trip/City Scheduled Maintenance
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Inspect engine accessory drive belt.
An Emission Control Service.
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Replace fuel filter.
An Emission Control Service. (See footnote
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If Equipped: Conduct Exhaust Gas Recirculation (EGR) system
inspection as described in the service manual.
An Emission Control Service. (See footnote
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Gasoline Engine Only: Conduct evaporative control system inspection. Check
all fuel and vapor lines and hoses for proper hook
Check that the purge valve works properly (if equipped). Replace as needed.
An Emission Control Service. (See footnote
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Rotate tires. See "Tire Inspection and Rotation" in the Index for proper
rotation pattern and additional information. (See footnote +.)
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Diesel Engine Only: Check the air intake system installation to assure that
gaskets are properly sealed and that all hose connections, fasteners and other
components are tight. Also check to be sure that the air cleaner housing is
properly seated and the cover fits tightly. Tighten connections and fasteners or
replace damaged parts as necessary. This is a Noise Emission Control Service.
Applicable only to vehicles sold in the United States.
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up, routing and condition.
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