DL11 - Measure EVR Solenoid Resistance

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

Possible causes are:

- Damaged EVR solenoid.

- Open harness circuit.

- Shorted harness.

- Damaged Powertrain Control Module (PCM).

- Key "OFF".

- Disconnect EVR solenoid.

- Measure EVR solenoid resistance.

- Is solenoid resistance between 20 and 70 ohms?

Yes -- Go to DL12. DL12 - Check VPWR Circuit Voltage at EVR Solenoid

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