Exhaust Emission Control System Description - Suzuki GSX-R750 Service Manual

Exhaust Emission Control System Description

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.
1
1. PAIR control solenoid valve
2. PAIR reed valve
3. Air cleaner box
3
2
"A"
"B"
4. Primary fuel injector
5. Secondary fuel injector
6. ECM
Emission Control Devices:
5
4
7
10
8
7. Exhaust control valve actuator
8. Exhaust control valve
9. Three-way catalyst
1B-3
B838H21201003
9
I837H1120047-01
10. HO2 sensor
"A": Fresh air
"B": Exhaust gas