DN115 - Check EGR Vacuum w/Engine Running

Continuous Memory Diagnostic Trouble Code (DTC) 334 indicates the EGR valve was open while the engine was stabilized and at idle sometime during vehicle operation. Possible causes:

- EGR valve not seating.

- EGR Vacuum Regulator (EVR) solenoid allowing excessive vacuum to EGR valve.

- Damaged EGR Valve Position (EVP) sensor.

- Key "OFF".

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

- Run engine to operating temperature and stabilized idle.

- With engine at idle, tap the EVR solenoid and wiggle the EVR connector while noting vacuum reading.

- Does the EGR vacuum remain below 3.4 kPa (1.0 in-Hg) with no sudden increase?

NOTE: EVR leakage below 3.4 kPa (1.0 in-Hg) is normal.

Yes -- Go to DN116. DN116 - Check EVR Signal For Intermittent Short

No -- Inspect EVR solenoid connector for shorts. Service as necessary. If OK, service or replace EVR solenoid. Reconnect all components. Clear continuous memory. Clearing Diagnostic Trouble Codes

Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)