Inlet Air Temperature Sensor Removal/Installation
Caution: Never drop the sensor, especially on a hard surface. Such a shock to the sensor can damage it.
- Remove the fuel tank (See Fuel Tank Removal).
- Disconnect the connector [A].
- Remove the screw [B].
- Pull out the inlet air temperature sensor [C].
- Put the inlet air temperature sensor into the air cleaner housing.
- Tighten the screw securely.
![](https://motoinstruction.ru/img/kawasaki/23/128277.jpg)
Inlet Air Temperature Sensor Output Voltage Inspection
Note: Be sure the battery is fully charged. The output voltage changes according to the inlet air temperature.
- Remove the ECU (See ECU Removal).
Do not disconnect the ECU connectors.
- Connect a digital meter to the ECU connector, using needle adapter set.
Special Tool - Needle Adapter Set: 57001-1457
![](https://motoinstruction.ru/img/kawasaki/23/128278.jpg)
Inlet Air Temperature Sensor Output Voltage Connections to ECU Connector
- Meter (+) → Y lead (terminal 26)
- Meter (-) → BR/BK lead (terminal 28)
- Measure the output voltage with the engine stopped and the connector joined.
- Turn the ignition switch ON.
Output Voltage at ECU
Standard: About 2.25-2.50 V at inlet air temperature 20°C (68°F)
- Turn the ignition switch OFF.
If the output voltage is out of the standard, check the wiring.
If the wiring is good, check the sensor resistance (See Inlet Air Temperature Sensor Resistance).
If the output voltage is within the standard, 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).
Air Temperature Sensor Resistance Inspection
- Remove the inlet air temperature sensor (See Inlet Air Temperature Sensor Removal/Installation).
- Suspend the sensor [A] in a container of machine oil so that the heat-sensitive portion is submerged.
- Suspend a thermometer [B] with the heat-sensitive portions [C] located in almost the same depth with the sensor.
Note: The sensor and thermometer must not touch the container side or bottom.
- Place the container over a source of heat and gradually raise the temperature of the oil while stirring the oil gently for even temperature.
- Using a digital meter, measure the internal resistance of the sensor across the terminals at the temperatures shown in the following.
Inlet Air Temperature Sensor Resistance
Standard: 5.4-6.6 k Ω at 0°C (32°F)
0.29-0.39 k Ω at 80°C (176°F)
![](https://motoinstruction.ru/img/kawasaki/23/128279.jpg)
If the measurement is out of the range, replace the sensor.
If the measurement is within the specified, replace the ECU (See ECU Removal/Installation).
Inlet Air Temperature Sensor Circuit
![](https://motoinstruction.ru/img/kawasaki/23/128280.jpg)
1. ECU; 2. Inlet Air Temperature Sensor; 3. Water-proof Joint E