Kawasaki STX-15F service manual Output Voltage at ECU Standard about 3 ∼ 4 V at 20C 68F

3-40 FUEL SYSTEM (DFI)

Water Temperature Sensor (Service Code/Character-14/AqUt)

•Connect a digital voltmeter [A] to the ECU connector [B], with the needle adapter set.

Special Tool - Needle Adapter Set: 57001-1457

Water Temperature Sensor Output Voltage

Connections to ECU

Meter (+) → G/Y lead (terminal 35)

Meter (–) → BK/W lead (terminal 8)

•Turn the ignition switch ON and push the lanyard key un- der the stop button.

•Pushing the start button, run the engine 5 ∼ 6 seconds at idling to measure the sensor output voltage.

○Wait 15 seconds before using the starter again.

Output Voltage at ECU

Standard: about 3 ∼ 4 V at 20°C (68°F)

NOTE

○The output voltage changes according to the coolant temperature in the engine.

•Turn the ignition switch OFF.

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 (e.g. when the wiring is open, the voltage is about 5 V), check the wiring (see next diagram).

If the wiring is good, check the water temperature sensor resistance.

•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