Exhaust Gas Recirculation (EGR) System
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. It is composed of the EGR valve, EGR vacuum control valve,
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 ideal EGR valve lift
which is determined by signals sent from the other sensors. If there is any difference between the two, the ECM varies cur-
rent to the EGR control solenoid valve to regulate vacuum applied to the EGR valve.
EGR
VALVE
LIFT
SENSOR
INTAKE
MANIFOLD
To No. 5 BACK-UP
LIGHTS ALTERNATOR
TURN SIGNALS
(15 A) FUSE
EGR
VACUUM
CONTROL
VALVE
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. It is composed of the EGR valve, EGR vacuum control valve,
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 ideal EGR valve lift
which is determined by signals sent from the other sensors. If there is any difference between the two, the ECM varies cur-
rent to the EGR control solenoid valve to regulate vacuum applied to the EGR valve.
EGR
VALVE
LIFT
SENSOR
INTAKE
MANIFOLD
To No. 5 BACK-UP
LIGHTS ALTERNATOR
TURN SIGNALS
(15 A) FUSE
EGR
VACUUM
CONTROL
VALVE