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)