DN10 - Check Resistance of EVR Solenoid

DTC 558 indicates a failure in the EGR Vacuum Regulator (EVR) solenoid circuit.

Possible causes:

- Damaged EVR solenoid.

- Open harness.

- Shorted harness.

- Damaged Powertrain Control Module (PCM).

- Key "OFF".

- Disconnect EVR solenoid.

- Measure solenoid resistance.

- Is resistance within 20 to 70 ohms?

Yes -- Go to DN11. DN11 - Check VPWR Circuit Voltage

No -- Replace EVR solenoid assembly. Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)