Input Voltage at Actuator

Standard: About 8.5  10.5 V DC

If the reading is within the standard but the actuator doesn’t operate, replace it.

If the reading is out of the range, check the wiring to ECU (see wiring diagram in this section).

If the wiring is good, check the ECU for its ground and power supply (see ECU Power Supply Inspection).

Subthrottle Valve Actuator Circuit

1. ECU

2. Subthrottle Valve Actuator

Air Switching Valve (Service Code 64)

Air Switching Valve Removal/Installation

_• Refer to the Air Switching Valve Removal/Installation in the Engine Top End chapter.

Air Switching Valve Inspection

_• Refer to the Air Switching Valve Operation Test/Unit Test in the Electrical System chapter.

_• Remove the fuel tank (see Fuel Tank Removal) and check

the wiring continuity, using the following diagram.

Air Switching Valve Circuit

1. ECU

2. Air Switching Valve

3. Water-proof Joint C

4. Ignition Switch

5. Water-proof Joint A

6. ECU Fuse 15 A

7. ECU Main Relay

8. Relay Box

9. Main Fuse 30 A

10. Battery

11. Frame Ground

12. Joint Connector

Oxygen Sensor Heater (Service Code 67) (Europe Models)

Oxygen Sensor Heater Removal/Installation

The oxygen sensor heater is built in the oxygen sensor. So, the heater itself can not be removed. Remove the oxy- gen sensor (see Oxygen Sensor Removal in the Electrical System chapter).

Oxygen Sensor Heater Inspection

_• Remove the engine sprocket cover (see Engine Sprocket Removal in the Final Drive chapter).

_• Disconnect the oxygen sensor lead connector [A].

_• Set the hand tester [A] to the × 1 Ω range and connect it to the terminals in the oxygen sensor lead connector [B].

Black [C] Black [D]

Special Tool - Hand Tester: 57001-1394

Oxygen Sensor Resistance

Standard: 11.7  14.5 Ω at 20°C (68°F)

If the tester reading is not as specified, replace the oxygen sensor with a new one.

If the tester reading is specified, check the power source voltage Inspection.

NOTE

○^{Be sure the battery is fully charged.}

_• Connect a digital voltmeter [A] to the oxygen sensor con- nector [B], using the needle adapter [C].

Special Tool - Needle Adapter Set: 57001-1457

_• Measure the power source voltage with the engine stopped, and with the oxygen sensor connector joined.

Oxygen Sensor Power Source Voltage Connections to Oxygen Sensor Connector

Tester (+) → W/Y lead [D]

Tester (−) → Battery (−) Terminal [E]

Standard: Battery Voltage (12.8 V or more)

Oxygen Sensor [F]

If the reading is incorrect, check the following. Battery

Main Fuse 30 A

Oxygen Sensor Heater Fuse 10 A

If the reading is good, the power source voltage is normal, Inspect the Red/Black lead between the oxygen sensor connector and the ECU for continuity, using the following diagram.

If the wiring is good, inspect the ECU for its ground, and power supply (see ECU Power Supply Inspection). If the ground and power supply are good, replace the ECU (see ECU Removal/Installation).

Oxygen Sensor Heater (Service Code 67) (Europe Models)

Oxygen Sensor Circuit

1. ECU

2. Oxygen Sensor

3. Water-proof Joint E

4. Water-proof Joint D

5. Oxygen Sensor Heater Fuse 10 A

6. Main Fuse 30 A

7. Battery

8. Frame Ground

9. Joint Connector