Kawasaki Ninja Service Manual: Main Throttle Sensor Output Voltage Inspection

• Measure the output voltage at the main throttle sensor in the same way as input voltage inspection, note the following.

Disconnect the main throttle sensor connector and connect the setting adapter [A] between these connectors.

Special Tool - Throttle Sensor Setting Adapter: 57001 -1538

Main Throttle Sensor Output Voltage Connections to Adapter: Digital Meter (+) → R (sensor V/W) lead

Digital Meter (–) → BK (sensor BR/BK) lead

Install the following parts temporarily.

Throttle Body Assy (see Throttle Body Assy Installation in the Fuel System (DFI) chapter) Air Cleaner Housing (see Air Cleaner Housing Installation in the Fuel System (DFI) chapter) Fuel Tank (see Fuel Tank Installation in the Fuel System (DFI) chapter)

• Start the engine and warm it up thoroughly.
• Check idle speed to ensure the throttle opening is correct (see Idle Speed Inspection in the Periodic Maintenance chapter).

  Throttle Sensor Setting Adapter [A]

Idle Speed Standard: 1 100 ±50 r/min (rpm)

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

Output Voltage Standard: DC 0.64 0.68 V at idle
throttle opening DC 3.89 4.09 V at full throttle
opening (for reference)

NOTE

• Open the throttle, confirm the output voltage will be raise.
• The standard voltage refers to the value when the voltage reading at the Input Voltage Inspection shows 5 V exactly.
• When the input voltage reading shows other than 5 V, derive a voltage range as follows.

Example: In the case of a input voltage of 4.75 V.

0.64 × 4.75 ÷ 5.00 = 0.61 V 0.68 × 4.75 ÷ 5.00 = 0.65 V Thus, the valid range is 0.61
0.65 V

• Turn the ignition switch to OFF.

If the reading is out of the standard, replace the throttle body assy.

If the reading is within 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] ←→ Main Throttle Sensor Connector [B] V/W lead (ECU terminal 25) [C] BR/BK lead (ECU terminal 13) [D]

If the wiring is good, 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).

Main Throttle Sensor Circuit

1. ECU

2. Subthrottle Sensor

3. Main Throttle Sensor