Camaro V8-305 5.0L VIN E TBI (1989)
EGR Control Solenoid: Description and Operation
Computer Command Control - Port Fuel Injection
The EGR vacuum control has a vacuum control solenoid that uses "Pulse Width Modulation" (PWM). This means that the ECM turns the solenoid
"OFF" and "ON" many times a second and varies the amount of "ON" time (pulse width) to vary the amount of EGR. The ECM may use inputs from the
following sensors to regulate the solenoid.
^
Coolant Temperature Sensor (CTS)
^
Throttle Position Sensor (TPS)
^
Mass Air Flow (MAF) sensor
