NPR L4-52L DSL Turbo (2005) - EGR Valve Specifications: Page 385
EGR Valve: Testing and Inspection
EGR Valve And EGR Cooler
Inspection
Gas leak check
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Check for gas leak in various parts of the EGR gas line.
If the results of the check show abnormalities, repair or replace the defective parts.
EGR valve check
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Refer to Engine Control System for details on the method of checking the EGR valve.