Engine Control Module: Description and Operation

EGR System Components:

The Powertrain Control Module (PCM) controls the EGR vacuum regulator solenoid. The EGR vacuum regulator solenoid controls the vacuum to the EGR valve. When the EGR valve opens, exhaust gas flows to the intake manifold. The EGR transducer measures the flow through the EGR valve to exhaust manifold tube and sends a signal to the PCM. A metering orifice in the EGR valve to exhaust manifold tube restricts the flow rate when the EGR valve (EGR valve) is open.

The PCM needs the following inputs to calibrate the engine properly:
^ camshaft position
^ engine rpm
^ engine coolant temperature
^ amount of engine detonation