Emission Control Devices: 1B-3
Exhaust Emission Control System Description
B823H11201003
The exhaust emission control system is composed of the PAIR system, exhaust control system, HO2 sensor, three-
way catalyst system and ISC system. The fresh air is drawn into the exhaust port through the PAIR control solenoid
valve and PAIR reed valve. The PAIR control solenoid valve is operated by the ECM, which is controlled according to
the signals from TPS, ECTS, IATS, IAPS and CKPS. The exhaust gas flow is performed by the exhaust control valve
actuator which is controlled by the ECM by changing the exhaust control valve angle. ISC valve adjusts the bypass air
volume of the throttle body to control engine idling speed with various sensor signals by varying engine running
conditions and the idling control contributes to reduce exhaust emission level.
3
2
6
5
4
7
9
8
10
11
“A”
“B”
1
I823H1120003-04
1. PAIR control solenoid valve 6. ISC valve 11. HO2 sensor
2. PAIR reed valve 7. ECM “A”: Fresh air
3. Air cleaner box 8. Exhaust control valve actuator “B”: Exhaust gas
4. Primary fuel injector 9. Exhaust control valve
5. Secondary fuel injector 10. Three-way catalyst
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