Operation

Operation:

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

The linear EGR valve is usually activated under the following conditions:
^ Warm engine operation
^ Above idle speed