Kawasaki STX-15F service manual Sensor Resistance Inspection

FUEL SYSTEM (DFI) 3-37

Inlet Air Temperature Sensor (Service Code/Character-13/AIrt)

If the output voltage is out of the specified, 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.

If the output voltage is far out of the specified, check the wiring (see next diagram).

•Remove the needle adapter set, and apply silicone sealant to the seals of the connector for waterproofing.

Silicone Sealant (Kawasaki Bond: 56019-120) -Seals

of ECU Connectors

If the wiring is good, check the sensor resistance.

Sensor Resistance Inspection

•Remove the inlet air temperature sensor (see Inlet Air Temperature Sensor Removal).

•Suspend the sensor [A] in a container of machine oil so that the heat-sensitive portion and threaded portion are submerged.

•Suspend a thermometer [B] with the heat-sensitive por- tion [C] located in almost the same depth with the sensor.

NOTE

○The sensor and thermometer must not touch the con- tainer 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 table.

Inlet Air Temperature Sensor Resistance

Standard: 5.4 ∼ 6.6 kΩ at 0°C (32°F)

2.26∼ 2.86 kΩ at 20°C (68°F)

0.29∼ 0.39 kΩ at 80°C (176°F)

If the measurement is out of the range, replace the sensor.

If the measurement is within the specified, replace the

ECU.