ELECTRICAL SYSTEM 16-89

Switches and Sensors

Brake Light Timing Inspection

•Refer to the Brake Light Switch Operation Inspection in the Periodic Maintenance chapter.

Brake Light Timing Adjustment

•Refer to the Brake Light Switch Operation Inspection in the Periodic Maintenance chapter.

Switch Inspection

•Using a hand tester, check to see that only the connections shown in the table have continuity.

Special Tool - Hand Tester: 57001-1394

○For the switch housings and the ignition switch, refer to the tables in the Wiring Diagram.

If the switch has an open or short, repair it or replace it with a new one.

Rear Brake Light Switch Connections

Sidestand Switch Connections

Oil Pressure Switch Connections*

*: Engine lubrication system is in good condition.

16-90 ELECTRICAL SYSTEM

Switches and Sensors

Water Temperature Sensor Inspection

•Remove the water temperature sensor (see Water Temperature Sensor Removal/Installation in the Fuel System (DFI) chapter).

•Suspend the sensor [A] in a container of coolant so that the threaded portion is submerged.

•Suspend an accurate thermometer [B] with temperature sensing portions [C] located in almost the same depth.

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 coolant while stirring the coolant gently.

•Using the hand tester, measure the internal resistance of the sensor.

Special Tool - Hand Tester: 57001-1394

○The sensor sends electric signals to the ECU and water temperature meter in the meter unit.

○Measure the resistance across the terminals and the body (for the gauge) at the temperatures shown in the table. If the hand tester does not show the specified values, replace the sensor.

Water Temperature Sensor

Resistance for ECU [D]

	Temperature	Resistance (kΩ)
		(Terminal [1]-[3])
	20°C (68°F)	2.46	+0.155
			–0.143
	80°C (176°F)	0.32 ±0.011
	110°C (230°F)	0.1426 ±0.0041
	Resistance for Water Temperature Gauge [E]
	Temperature	Resistance (Ω)
		(Terminal [2]-Body)
	50°C (122°F)	210 ±40
	120°C (248°F)	21.2 ±1.5

Speed Sensor Removal

•Remove the fuel tank (see Fuel Tank Removal in the Fuel System (DFI) chapter).

•Disconnect the connector [A].

ELECTRICAL SYSTEM 16-91

Switches and Sensors

•Remove: Bolt [A]

Lead [B] (Free) Speed Sensor [C]

Speed Sensor Installation

•Run the lead [A] as shown in the figure.

•Apply a non-permanent locking agent to the threads of the speed sensor bolt, and tighten it.

Torque - Speed Sensor Bolt: 6.9 N·m (0.70 kgf·m, 61 in·lb)

•Install the removed parts (see appropriate chapters).

Speed Sensor Inspection

•Remove the speed sensor (see Speed Sensor Removal).

•Connect the speed sensor connector [A] with the battery [B], 10 kΩ resistor [C] and hand tester [D] as shown in the figure.

•Set the tester to the DC 25 V range.

Special Tool - Hand Tester: 57001-1394

•Trace [A] each side of the speed sensor surface with the screwdriver.

○Then the tester indicator should flick [B].

If the tester indicator does not flick, replace the speed sensor.

Fuel Reserve Switch Inspection

•Fill the fuel tank with fuel and close the fuel tank cap.

•Remove the front seat (see Front Seat Removal in the Frame chapter).

•Disconnect the fuel pump lead connector [A].

16-92 ELECTRICAL SYSTEM

Switches and Sensors

•Connect the test light [A] (12 V 3.4 W bulb in a socket with leads) and the 12 V battery [B] to the fuel pump lead connector [C].

Connections:

Battery (+) → 12 V 3.4 W Bulb (One Side)

12 V 3.4 W Bulb (Other Side) → R/BK lead [D] Battery (–) → BK/W lead [E]

If the test light turn on, the reserve switch is defective. Replace the fuel pump.

•Draw the fuel out from the fuel tank with a commercially available pump (see Fuel Tank Removal in the Fuel System (DFI) chapter).

•Connect the test light (12 V 3.4 W bulb in a socket with leads) and the 12 V battery to the fuel pump lead connector in the same way again.

Connections:

Battery (+) → 12 V 3.4 W Bulb (One Side) 12 V 3.4 W Bulb (Other Side) → R/BK lead Battery (–) → BK/W lead

If the test light does not light, replace the fuel pump.

NOTE

○It may take a long time to turn on the test light in case that the fuel reserve switch is inspected just after the fuel is drawn. Leave the fuel pump lead connector with leads for inspection connected for few minutes.

Oxygen Sensor Removal (Equipped Models)

•Disconnect the oxygen sensor lead connector [A].

CAUTION

Do not pull strongly, twist, or bend the oxygen sensor lead. This may cause the wiring open.

•Free the lead [A] from the clamp.

•Remove the oxygen sensor [B].