Honda ACCORD HYBRID 2005 Service Manual page 288

Fuel and Emissions Systems
S y s t e m D e s c r i p t i o n ( c o n t ' d )
Exhaust G a s Recirculation (EGR) System Diagram
The EGR system reduces oxides of nitrogen (NOx) emissions by recirculating exhaust gas t h r o u g h the EGR valve and
the intake manifold into the c o m b u s t i o n chambers. The PCM m e m o r y includes the ideal EGR valve position for
v a r y i n g operating conditions.
The EGR valve position sensor detects the a m o u n t of EGR valve lift and sends it to the PCM. The PCM then compares it
w i t h the ideal lift in its m e m o r y (based on signals sent f r o m other sensors). If there is any difference between the t w o ,
the PCM cuts current to the EGR valve.
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