Test DN: Step 50

50) Code 34: Check EGR Valve Operation in KOER Self-Test With EGR Vacuum Disconnected  KOER Code 34 indicates that EVP voltage is greater than closed position self-test limit of 0.67 volt. Possible causes for this fault are: obstructed EVR solenoid filter, faulty EVR solenoid, faulty EGR valve, or faulty EVP sensor. Turn key off. Disconnect and plug EGR valve vacuum hose. Perform KOER Self-Test. If Code 34 is not present, check EVR solenoid filter for obstructions. Replace if necessary. If filter is okay, replace EVR solenoid. Connect all vacuum hoses and repeat QUICK TEST. If Code 34 is present, go to next step.