HE33 - Inspect EVR Solenoid and Hoses For Potential Plugging

- Key Off.

- Remove EVR solenoid vent filter and inspect for contamination and excessive water absorption. (In cold climate, excessive water in filter could freeze and plug the EVR vent.)

- Inspect EGR vacuum hose for possible blockage or pinching.

- Is EVR solenoid vent or filter contaminated or vacuum line plugged?

YES -- SERVICE EVR solenoid or EGR vacuum hose as necessary. RECONNECT all components. COMPLETE PCM Reset to clear DTCs. Clearing Diagnostic Trouble Codes

Rerun quick test. Diagnostic Subroutines (DSR) - Extracting Codes

NO -- Unable to duplicate and/or identify fault at this time. GO to Pinpoint Test Step Z1 with the following data: DPFE, EVR and VREF PIDs and list of Possible Causes. Z1 - Intermittent Test Procedure