# Throttle Sensor Resistance Inspection - Kawasaki KX450F Service Manual

Motorcycle.

Throttle Sensor (Service Code 11)
Measure the output voltage with the engine stopped, and
with the connector joined.
Refer to the Self-diagnosis Procedures, connect the 12 V
battery to the main harness.
Output Voltage
DC 0.58 ∼ 0.62 V at idle throttle opening
Standard:
DC 3.68 ∼ 3.88 V at full throttle opening (for
reference)
Open the throttle, confirm the output voltage will be rise.
The standard voltage refers to the value when the volt-
age reading at the Input Voltage Inspection shows 5 V
exactly.
When the input voltage reading shows other than 5 V,
derive a voltage range as follows.
Example:
In the case of a input voltage of 4.75 V.
0.58 × 4.75 ÷ 5.00 = 0.55 V
0.62 × 4.75 ÷ 5.00 = 0.59 V
Thus, the valid range is 0.55
Disconnect the power supply harness.
If the reading is out of the standard, check the throttle sen-
sor resistance (see Throttle Sensor Resistance Inspec-
tion).
If the reading is within the standard, remove the ECU and
check the wiring for continuity between the main harness
connectors.
Disconnect the ECU and sensor connectors.
Wiring Continuity Inspection
ECU Connector [A] ←→
Throttle Sensor Connector [B]
If the wiring is good, check the ECU for its ground and
power supply (see ECU Power Supply Inspection).
If the ground and power supply are good, replace the ECU
(see ECU Removal/Installation).

## Throttle Sensor Resistance Inspection

Disconnect the throttle sensor connector.
Connect a digital meter [A] to the throttle sensor connector
[B].
Measure the throttle sensor resistance.
Throttle Sensor Resistance
Connections:
4 ∼ 6 kΩ
Standard:
If the reading is out of the standard, replace the throttle
sensor (see Throttle Sensor Replacement).
If the reading is within the standard, but the problem still
exists, replace the ECU (see ECU Removal/Installation).
NOTE
0.59 V
FUEL SYSTEM (DFI) 3-35