Honda CRF450R 2009 Service Manual page 56

TECHNICAL FEATURE
PGM-FI SYSTEM
The PGM·FI system consists of following parts:
'09 shown:
EN'3INIE
s"rop
SWITCH
MAP SENSOR
ECM
FUEL INJECTOR
No.1
CKP
SENSOR
ECT SENSOR
No.2
CKP
SENSOR TP SENSOR
GEAR PO'5ITIION 'SWITC. ('09)
ECM AND SENSORS
The ECM and each sensor function as follows:
ECM: controls the proper fuel injection and ignition parameters by calculating the data from the sensors linked to the ECM.
fAT sensor: detects changes in the intake air temperature and sends the information to the ECM with variations in voltage.
MAP sensor: detects changes in the intake air pressure and sends the information to the ECM with variations in voltage.
TP sensor: detects the opening angle of the throttle and sends the information to the ECM with variations in voltage.
ECT sensor: detects changes in the coolant temperature with a thermistor.
CKP sensors: send crank angle information to the ECM for accurate ignition and injection operation. Two CKP sensors are
used for highly accurate detecting of the crank angle and which allow the PGM·FI system to correclly coordinate ignition timing
and fuel injection.
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