C 1500 Truck 2WD V6-262 4.3L VIN Z TBI (1995)
EGR Valve: Description and Operation
Linear EGR Valve
Exhaust Gas Flow
NOTE: The linear EGR valve is used on 4.3L VIN Z engines with California emissions. For 4.3L VIN Z engines without California emissions, refer to
Negative Backpressure EGR Valve.
PURPOSE:
The Linear EGR valve is operated exclusively by Control Module command. The PCM monitors various engine parameters:
-
Throttle Position Sensor (TPS).
-
Manifold Absolute Pressure (MAP).
-
Coolant Temperature Sensor (TPS).
-
Pintle Position Sensor (PPS).
Output messages are then sent to the EGR system indicating the proper amount of exhaust gas recirculation necessary to lower combustion
temperatures. This electronic metering of exhaust gas is ten times faster than vacuum operated models and offers improved diagnostic capabilities
as well.
