EEC-V Equipped Vehicles
- Turn ignition off. Disconnect and plug vacuum hose at EGR valve. Connect hand vacuum pump to EGR valve. Connect scan tool to DLC.
- Start engine and bring to operating temperature. Allow engine to idle. Adjust scan tool to read EGR Differential Pressure Feedback Sensor voltage.
- Slowly apply 5-6 in. Hg to EGR valve and hold for 10 seconds. Keep engine speed at 800 RPM.
- As vacuum increases, voltage should rise to about 2.5 volts. When vacuum is held steady, voltage should hold steady.
- If EGR does not hold vacuum, check for defective EGR valve. If Differential Sensor Pressure Feedback Sensor voltage is not as specified, check for defective sensor. Also check for blocked EGR passages.