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Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 51 (Engine Controls Self-Diagnostics - 5.0L & 5,7L) >> Diagnostic Tests >> DTC P1404: EGR Valve Closed Pintle Position >> Test Description

Test Description

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2002 GMC Savana Special, 2002 GMC Savana Camper Special, 2002 GMC Savana, 2002 Chevrolet RV Cutaway, and 2002 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers in the diagnostic procedures.

  1. 2

    Commanding the EGR valve open and closed determines whether the EGR system can control the EGR valve accurately and if the EGR valve will return to the fully closed position. Not all vehicles will display actual EGR at 100 percent.

  2. 4

    When the EGR valve harness connector is disconnected, the scan tool should display the actual EGR position as 0 percent. If the scan tool does not, the malfunction lies either in the EGR signal circuit or the PCM.

  3. 6

    If the EGR valve 5-volt reference is shorted to voltage, the Digital Multimeter (DMM) will read battery voltage and additional DTCs may be set.

  4. 12

    Clearing the DTCs is a very important step for this diagnostic. The clearing function allows the EGR valve to relearn a new minimum pintle position as the old position was inaccurate due to the malfunction that caused the DTC. If the PCM sees an EGR command, the new minimum pintle position will not be learned.

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