DN - Testing Notes

NOTE: You should enter this Pinpoint Test only when you have been directed here from Quick Test or from Pinpoint Test S8.

REMEMBER


This Pinpoint Test is intended to diagnose only the following:

- EVP sensor

- Harness circuits: VREF, EVP, SIG RTN, EVR, VPWR

- EVR solenoid

- EGR valve assembly

- Processor assembly

- EGR and EVR vacuum lines



DESCRIPTION


The EGR Valve Position (EVP) Sensor monitors the position of the EGR valve pintle. The EVP sensor converts the mechanical movement of the pintle into an electrical voltage signal which is relayed to the processor. The EVP sensor is a linear potentiometer in which resistance varies with the EGR valve pintle movement. The EVP sensor provides the processor with information on EGR flow and EGR system failures.