Throttle Position Sensor Inspection - Honda CRF450X 2005 Service Manual

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Attach a tachometer according to its manufacture's
instructions.
Read the instruction for timing light operation.
Start the engine and hold it at 1,800
±
100 rpm while
pointing the timing light towards the index notch .
The ignition timing is correct if the "F" mark on the
flywheel aligns with the index notch in the left
crankcase cover.
Check that the O-ring is in good condition, replace it
if necessary.
Apply oil to the O-ring and install it onto the timing
hole cap.
Apply grease to the timing hole cap threads.
Install the timing hole cap and tighten it to the spec-
ified torque.
TORQUE: 10 N'm 11.0 kg f·m . 7 Ibf ·ftl
THROTTLE POSITION SENSOR
INSPECTION
Remove the fuel tank (page 3-8).
Disconnect the throttle pOSition sensor 3P (Black)
connector.
Measure the resistance between the Blue and Black
wire terminals of the sensor side connector.
Check that t he resistance between the Yellow and
Black wire terminals varies with the throttle position
while operating the throttle grip.
Fully closed-Fully open position:
IGNITION SYSTEM
3P (BLACK) CONNECTOR
••
BLUE YELLOW
Resist ance increases BLUE
Fully open-Fully closed position:
Resist ance decreases
If both measurements are abnormal, repla ce the
th rottle position sensor (page 6-26).
BLACK
BLACK
18-9
,.-