SL L4-1.9L SOHC VIN 9 (1991)
EGR Control Module: Description and Operation
Linear EGR System.
Linear EGR Module.
LINEAR EGR SYSTEM
Based on the inputs to the PCM a pintle position (pulse width) is commanded to the EGR module. The EGR module then reads this signal and
commands a pintle position to the linear EGR valve directly. The EGR module connection consists of ignition voltage, a ground circuit, an input
signal from the PCM and the EGR valve control circuit.
The EGR module is required because the PCM driver does not have the current capability to drive the EGR valve on its own.
The solenoid (bobbin and coil) assembly is energized by current which enters the valve through an electrical connector (terminal "E"), then flows
through the solenoid assembly to the control module and creates an electromagnetic field. This field causes the armature assembly to be pulled
upward, lifting the pintle a variable amount off the base.
The exhaust gas then flows from the cylinder head exhaust port (through the orifice) to the intake manifold. The height of the pintle is read by the
pintle position sensor, and the control module closes the loop as desired position versus actual position read, changing the pulse width modulated
command to the solenoid accordingly, until the actual pintle position equals the desired pintle position.
