Operation

Operation:

The linear EGR valve is designed to accurately supply EGR to an engine independent of the intake manifold vacuum. The valve controls the EGR flow from the exhaust to the intake manifold through an orifice with a PCM controlled pintle. During operation, the PCM controls the pintle position by monitoring the pintle position feedback signal. The feedback signal can be monitored with a scan tool as the Actual EGR Position. The Actual EGR Position should always be near the commanded EGR position ( Desired EGR Position). The PCM uses information from the following sensors to control the pintle position:
^ The Engine Coolant Temperature (ECT) sensor
^ The Throttle Position (TP) sensor
^ The Mass Air Low (MAF) sensor

The linear EGR valve is usually activated under the following conditions:
^ A warm engine operation
^ An engine speed above idle