Ckp Sensor; Ho2 Sensor; Isc Valve - Suzuki 125 Service Manual

28 RV125K7 ('07-MODEL)

CKP SENSOR

CKP (Crank position) sensor generates the reference ignition
signal and sends it to ECM.
ECM calculates and determines the injection and ignition tim-
ings on the basis of this signal.

HO2 SENSOR

HO2 (Heated Oxygen) sensor is made of zirconia element (plat-
inum plated) which changes output voltage depending on the
oxygen concentration difference between its internal and exter-
nal surfaces.
The terminal voltage change is dependent on the oxygen con-
centration in the exhaust gas. This detected voltage value there-
fore represents the oxygen concentration.
The terminal voltage decreases when the oxygen concentration
is high, and increases when it is low.
NOTE:
As the zirconia element is not conductive below 250 °C, HO2
sensor will not function properly until the engine is at normal
operating temperature.

ISC valve

ISC (Idle Speed Control) valve controls the cold engine fast idle
speed as well as warmed engine idle speed.
The air volume is adjusted by opening or closing the bypass port
provided in the throttle port.
By controlling the fuel injection volume and air flow, the idle
speed is maintained at a constant level, eliminating the need of
manual adjustment.