Emission Control System - Honda Civic Service Manual

Emission Control System
Exhaust Gas Recirculation (EGR) System (D16yS engine)
Doscription
The EGR system is designed to reduce oxides of nitrogen emissions (NOx) by recirculating exhaust gas through the EGR
valve and the intake manifold into the combustion chambers. lt is composed of the EGR valve. EGR vacuum conrrot vatve.
EGR control solenoid valve. ECM and various sensors.
The EcM contains memories for ideal EGR valve lifts for varying operating conditions, The EGR valve lift sensor detects
the amount of EGR valve lift and sends the information to the ECM. The ECM then compares it with the ideat EGR valve lift
which is determined by signals sent from the other sensors. lf there is any difference between the two. the EcM cuts cur-
rent to the EGR control solenoid valve to reduce vacuum applied to the EGR valve.
EGR CONTROL
CVT:
SOLENoID vALvE
EGN VALVE LIFT SENSOR
BLK
I
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