Express, Savana, G1500, G2500, G3500, 1998-2005

EGR Valve Position Sensor

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Operation



The PCM uses the EGR position sensor to determine the position of the EGR valve. The PCM sends a reference voltage through the 5-volt reference circuit to the EGR position sensor. The PCM provides a voltage return path for the sensor through the low reference circuit. A variable voltage signal, based on the EGR valve position, is sent from the sensor to the PCM through the EGR position sensor signal circuit.

Removal & Installation



If the EVP sensor is defective the entire EGR valve motor will need to be replaced.

  1. Remove the air cleaner duct.
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  3. Detach the electrical connector.
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  5. Remove the screws securing the motor, then remove the motor and spacer (if equipped) from the valve.
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  7. Installation is the reverse of removal. Tighten the screws to 18 inch lbs. (2 Nm).

    Click image to see an enlarged view

    Fig. EVP sensor mounting-6.6L engines

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Testing



  1. With the ignition OFF, test for less than 1 ohm of resistance between the low reference circuit terminal B and ground. If greater than the specified range, test the low reference circuit for an open or high resistance.
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  3. With the ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal A and ground. If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If a short is not found, the PCM is faulty.
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  5. With the ignition ON, and the EGR valve disconnected, observe that the EGR Position parameter on the scan tool is 0 volt. If the EGR Position parameter is more than 0 volt, test the signal circuit for a short to voltage. If a short is not found, the PCM is faulty.
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  7. With the ignition ON and the EGR valve disconnected, connect a jumper wire between the 5-volt reference circuit terminal A of the EGR valve and the signal circuit terminal C of the EGR valve and observe with a scan tool that the EGR sensor parameter displays 4.98-5.02 volts. If the EGR Sensor parameter is less than 4.98 volts, test the signal circuit for an open, short to ground, or high resistance.
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  9. If all tests are normal, but the sensor is throwing a DTC code, then the sensor is faulty.
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