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Nissan-Datsun
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2004
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Frontier Base, Automatic
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Repair and Diagnosis
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Engine Performance
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Engine Control System - KA24DE
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DTC P0400: EGR Function
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Component Inspection
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EGR Valve
EGR Valve
Apply vacuum to EGR vacuum port with a hand vacuum pump.
EGR valve spring should lift.
Check for sticking.
Fig 1: Applying Vacuum To EGR Vacuum Port With A Hand Vacuum Pump
Courtesy of NISSAN MOTOR CO., U.S.A.