DL98 - Check EVR Solenoids For Shorts

An EGR Vacuum Regulator (EVR) solenoid or EVR driver circuit short could cause the EVR to open supplying the EGR valve with vacuum.

- Key "OFF".

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

- Run engine to operating temperature and stabilized idle.

- With the 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 -- Leave vacuum gauge connected. Go to DL99. DL99 - Check EVR Harness Circuit For Intermittents

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)