HE32 - Monitor EGR Valve Vacuum While Wiggling EVR Circuit

NOTE: An intermittent short to GND in the EVR circuit will cause the vacuum applied to the EGR valve to be higher than normal while the short is present. The vacuum available at the EGR valve at idle is normally below 1.0 inHg and it takes about 1.6 inHg for the valve to begin to open.

- Key Off.

- Disconnect vacuum hose at EGR valve and connect hose to a vacuum gauge.

- Key On, engine running.

- Observe vacuum gauge for an indication of a fault while performing the following:
- Lightly tap on the EVR solenoid; wiggle the EVR solenoid connector and vehicle harness between solenoid and PCM. A fault is indicated by a sudden jump in vacuum reading.

- Is a fault indicated?

YES -- ISOLATE fault and SERVICE as necessary. RECONNECT all components. COMPLETE PCM Reset to clear DTCs. Clearing Diagnostic Trouble Codes

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

NO -- RECONNECT vacuum hose. GO to HE33. HE33 - Inspect EVR Solenoid and Hoses For Potential Plugging