Subthrottle Sensor Removal/Adjustment
Caution: Do not remove or adjust the subthrottle sensor [A] since it has been adjusted and set with precision at the factory. Never drop the throttle body assy, especially on a hard surface. Such a shock to the sensor can damage it.
![](https://motoinstruction.ru/img/kawasaki/23/128295.jpg)
Subthrottle Sensor Input Voltage Inspection
Note: Be sure the battery is fully charged.
- Remove the air cleaner housing (See Air Cleaner Housing Removal).
- Turn the ignition switch OFF.
- Disconnect the subthrottle sensor connector and connect the harness adapter [A] between these connectors.
Special Tool - Throttle Sensor Setting Adapter #1: 57001-1400
- Connect a digital meter to the harness adapter lead.
![](https://motoinstruction.ru/img/kawasaki/23/128296.jpg)
Subthrottle Sensor Input Voltage
Connections to Adapter
- Meter (+) → BL (sensor BL) lead
- Meter (-) → BK/BL (sensor BK) lead
- Measure the input voltage with the engine stopped and with the connector joined.
- Turn the ignition switch ON.
Input Voltage at Sensor Standard: DC 4.75-5.25 V
- Turn the ignition switch OFF.
If the input voltage is normal, check the sensor output voltage.
If the input voltage is less than the standard, remove the ECU and check the wiring between these connectors.
Disconnect the ECU and sensor connectors.
Wiring Connection
- ECU Connector [A] <—>
- Subthrottle Sensor Connector [B]
- BL lead (terminal 10)
- BR/BK lead (terminal 28)
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).
![](https://motoinstruction.ru/img/kawasaki/23/128297.jpg)
Subthrottle Sensor Output Voltage Inspection
- Remove the air cleaner housing (See Air Cleaner Housing Removal).
- Measure the output voltage at the subthrottle sensor in the same way as input voltage inspection. Note the following.
Disconnect the subthrottle sensor connector and connect the harness adapter [A] between these connectors.
Special Tool - Throttle Sensor Setting Adapter #1: 57001-1400
![](https://motoinstruction.ru/img/kawasaki/23/128298.jpg)
Subthrottle Sensor Output Voltage
Connections to Adapter
- Meter (+) → Y/W (sensor Y) lead
- Meter (-) → BK/BL (sensor BK) lead
- Turn the ignition switch ON.
- Measure the output voltage when the subthrottle valve is fully opened or completely closed by hand.
Output Voltage at Sensor
Standard: DC 0.4-0.6 V (at idle throttle opening)
DC 3.825-3.975 V (at full throttle opening)
- Turn the ignition switch OFF.
If the output voltage is out of the standard, inspect the subthrottle sensor resistance.
If the output voltage is normal, check the wiring for continuity.
Disconnect the ECU and sensor connectrs.
Wiring Connection
- ECU Connector [A] <—>
- Subthrottle Sensor Connector [B]
- BL/W lead (terminal 24)
- BR/BK lead (terminal 28)
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).
![](https://motoinstruction.ru/img/kawasaki/23/128299.jpg)
Subthrottle Sensor Resistance Inspection
- Turn the ignition switch OFF.
- Disconnect the subthrottle sensor connector.
- Connect a digital meter [A] to the subthrottle sensor connector [B].
- Measure the subthrottle sensor resistance.
Throttle Sensor Resistance
Connections:
- BL lead [C] <—> BK lead [D]
- Standard: 4-6 kQ
If the reading is out of the range, replace the throttle body assy.
If the reading is within the range, but the problem still exists, replace the ECU (See ECU Removal/Installation).
![](https://motoinstruction.ru/img/kawasaki/23/128300.jpg)
Subthrottle Sensor Circuit
![](https://motoinstruction.ru/img/kawasaki/23/128301.jpg)
1. ECU; 2. Water-proof Joint E; 3. Water-proof Joint D; 4. Subthrottle Sensor