Camaro IROC-Z V8-350 5.7L VIN 8 FI (1990)
EGR Control Solenoid: Description and Operation
EGR Control Solenoid
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).
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Throttle Position Sensor (TPS).
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Mass Air Flow Sensor (MAF).
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Manifold Absolute Pressure Sensor (MAP).
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Manifold Air Temperature Sensor (MAT).
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P/N Switch.
