Suzuki FL125S Service Manual page 301

FL125SDW 8-26
IAP/TP/IAT SENSOR
The IAP sensor/TP sensor/IAT sensor are combined into one.
IAP sensor
The value of intake air pressure is converted into an electrical
signal and sent to ECM.
The base fuel injection time (volume) in light load is determined
in accordance with this electrical signal (output signal).
The higher the intake air pressure, the higher the signal voltage
becomes.
TP sensor
TP (Throttle Position) sensor is a sort of hall element and
detects the throttle valve opening.
The sensor voltage is translated to throttle opening voltage and
sent to ECM.
The base fuel injection time (volume) in high load is determined
in accordance with this electrical signal (output signal).
The wider the throttle opening, the higher the signal voltage
becomes.
IAT sensor
IAT (Intake Air Temperature) sensor senses the intake air tem-
perature as ohmic value of thermistor and sends it to ECM.
When the intake air temperature is low, the injection volume is
increased.
The thermistor ohmic value increases with the intake air temper-
ature low and decreases with the temperature high.
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.