KA - Testing Notes

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


REMEMBER


To prevent the replacement of good components, be aware that the following non-EEC areas may be at fault.

- Damaged vacuum hoses

- Back Pressure Transducer

- EGR valve

This Pinpoint Test is intended to diagnose only the following:


- EGR Vacuum Regulator (EVR) solenoid

- Harness circuits: EVR, and VPWR

- Processor assembly



DESCRIPTION

The EGR Vacuum Regulator (EVR) solenoid regulates the vacuum supply to the EGR valve via the Back Pressure Transducer (BPT). If the EVR solenoid is energized, the solenoid valve opens a path for the manifold vacuum to be applied to the EGR valve. If the EVR solenoid is not energized, then the solenoid valve closes the vacuum path to the EGR valve and vacuum is vented to the atmosphere.