EGR Valve: Testing and Inspection

EGR valve, checking

Requirement
- engine oil temperature 50°C (122°F) minimum

- start engine and let idle





- disconnect EGR valve vacuum hose (from the connector hose)
- connect US 8026 hand vacuum pump to EGR valve
- operate vacuum pump
- idle behavior must deteriorate

If no change
- check exhaust inlet and outlet tubes for flow, clean or replace as necessary
- check exhaust tube connections for tightness, tighten if necessary

If OK
- replace EGR valve

- activate Fault memory and then erase
- checking and testing can generate a Diagnostic Trouble Code (DTC) for this component which will then be stored in the DTC memory