The exhaust gas recirculation valve inside your vehicle is a crucial component in reducing harmful emissions and ensuring your vehicle runs smoothly. Electronic EGR valves are used in vehicles dated 1990 and later. The vehicle’s computer operates the valve in place of previous years’ EGR valves, which are operated by engine vacuum. The procedure for testing an electronic EGR is a bit different and requires a multimeter. If you notice your vehicle is malfunctioning, stalling, or has poor fuel economy, you should test the EGR. High volts could mean there is a blockage somewhere inside the EGR valve and no voltage could indicate a problem with the valve and communication with the computer.
Step 1: how to test egr valve
Turn off the vehicle and remove the key from the ignition. Allow the EGR valve to cool long enough.
Step 2: check egr valve
Open the hood and locate the EGR valve. The valve is mounted on the exhaust manifold. Consult your vehicle’s repair manual for the exact location and a diagram.
Step 3: how to check egr valve
Turn on the multimeter and set the dial to “Volts DC.” Connect the red lead wire to the EGR circuit labeled “C”. There are five circuits in the EGR and each is labeled AE. Connect the black lead of the multimeter to a ground point, such as the negative battery lead.
Turn the ignition key to the “On” position. Read the multimeter. If the volts measure above 0.9, then the system needs to be repaired. If there is no voltage, the EGR is bad and needs to be replaced.