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DN41 - Verify Vacuum Supply to EVR Solenoid

- Key "OFF".

- Disconnect the vacuum source to the EGR Vacuum Regulator (EVR) solenoid.

- Install a vacuum gauge at source vacuum.

- Start engine and check vacuum.

- Is vacuum greater than 33 kPa (10 in-Hg)?

Yes -- Go to DN42. DN42 - Check Vacuum Hose Between EVR Solenoid & EGR Valve

No -- Check source vacuum hose to EVR solenoid. Service as necessary. Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)

For applications with a vacuum reservoir, refer to Emission Control Systems for vacuum reservoir diagnosis.