Kawasaki Ninja Service Manual: Water Temperature Sensor Output Voltage Inspection

NOTE

Be sure the battery is fully charged.

• Turn the ignition switch to OFF.
• Remove the throttle body assy (see Throttle Body Assy Removal in the Fuel System (DFI) chapter).
• Disconnect the water temperature sensor connector and connect the measuring adapter [A] between these connectors as shown in the figure.

  Harness [B] Water Temperature Sensor [C]

Special Tool - Measuring Adapter: 57001-1700

• Connect a digital meter [D] to the measuring adapter leads.

Water Temperature Sensor Output Voltage Connections to Adapter: Digital Meter (+) → R (sensor O) lead Digital Meter (–) → BK (sensor BR/BK) lead

• Connect the connectors of the following parts temporarily.

  ECU Intake Temperature Sensor Throttle Body Assy Connectors

• Measure the output voltage with the engine stopped and the connector joined.
• Turn the ignition switch to ON.

Output Voltage Standard: About DC 2.80 2.97 V at
20°C (68°F)

NOTE

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

• Turn the ignition switch to OFF.

If the reading is within the standard, check the ECU for its ground, and power supply (see ECU Power Supply Inspection in the Fuel System (DFI) chapter).

If the ground and power supply are good, replace the ECU (see ECU Removal/Installation in the Fuel System (DFI) chapter).

If the reading is out of the standard, remove the ECU and check the wiring for continuity between harness connectors.

Special Tool - Hand Tester: 57001-1394

Disconnect the ECU and sensor connectors.

Wiring Continuity Inspection ECU Connector [A] ←→ Water Temperature Sensor Connector [B] O lead (ECU terminal 23) [C] BR/BK lead (ECU terminal 13) [D]

If the wiring is good, check the water temperature sensor resistance (see Water Temperature Sensor Resistance Inspection).