3-96 FUEL SYSTEM (DFI)

Exhaust Butterfly Valve Actuator (Service Code 63)

Exhaust Butterfly Valve Actuator Removal

CAUTION

Never drop the exhaust butterfly valve actuator especially on a hard surface. Such a shock to the actuator can damage it.

•Remove:

Exhaust Butterfly Valve Cable Upper Ends (see Exhaust Butterfly Valve Cable Removal in the Engine Top End chapter)

Connectors [A] Screws [B]

Exhaust Butterfly Valve Actuator [C]

•Remove the pulley bolt while holding the pulley [A] with the suitable tool [B].

CAUTION

If the pulley bolt is removed without holding, the actuator damage will occur.

•Remove the pulley from the actuator.

Exhaust Butterfly Valve Actuator Installation

•Install the pulley [A] on the actuator so that the hole side [B] align with the groove [C] on the shaft.

•Tighten the pulley bolt [A] while holding the pulley with the suitable tool [B].

Torque - Exhaust Butterfly Valve Actuator Pulley Bolt: 4.9 N·m (0.50 kgf·m, 43 in·lb)

CAUTION

If the pulley bolt is tightened without holding, the actuator damage will occur.

FUEL SYSTEM (DFI) 3-97

Exhaust Butterfly Valve Actuator (Service Code 63)

•After tightening the pulley bolt, confirm whether pulley [A] is an angle shown in the figure.

41.7° ±0.7° [B]

○This position is original position of the pulley.

NOTE

○Correct the position electrically after confirming use is discontinued and there is no damage when differing from the angle of shown in the figure.

CAUTION

Do not correct the pulley position with the tool, forcibly. The actuator damage will occur.

If the pulley angle is wrong, adjust the angle as follows. ○Connect:

2 pins Connector

3 pins Connector

○Turn the ignition switch ON.

○The pulley turns clockwise and then counterclockwise, and clockwise again.

○Turn the ignition switch OFF.

○Confirm that the pulley turns counterclockwise and the pulley returns to the original position.

If the position is not within the specified angle above, replace the exhaust butterfly valve actuator.

•Be sure to install the washers [A] on the exhaust butterfly valve actuator [B] and rear fender [C].

•Tighten:

Torque - Exhaust Butterfly Valve Actuator Mounting Screws [D]: 4.3 N·m (0.44 kgf·m, 38 in·lb)

•Install the upper ends of the exhaust butterfly valve cables and adjust them (see Exhaust Butterfly Valve Cable Installation in the Engine Top End chapter).

3-98 FUEL SYSTEM (DFI)

Exhaust Butterfly Valve Actuator (Service Code 63)

Exhaust Butterfly Valve Actuator Inspection

NOTE

○Be sure the battery is fully charged.

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

•Turn the ignition switch ON.

•Check to see the pulley [A] turns clockwise [B] and counterclockwise [C] smoothly.

○The pulley turns clockwise and then counterclockwise, and clockwise again.

•Turn the ignition switch OFF. ○The pulley turns counterclockwise.

If the pulley does not operate, check the exhaust butterfly valve actuator resistance (see Exhaust Butterfly Valve Actuator Resistance Inspection).

Exhaust Butterfly Valve Actuator Resistance

Inspection

•Turn the ignition switch OFF.

•Disconnect the exhaust butterfly valve actuator lead connector (2 pins connector) [A].

•Set the hand tester to the × 1 Ω range and connect it to the exhaust butterfly valve actuator connector.

Special Tool - Hand Tester: 57001-1394

•Measure the exhaust butterfly valve actuator resistance.

Exhaust Butterfly Valve Actuator Resistance

Connections: P lead ←→ GY lead

If the reading is 0 or infinity (∞) Ω, replace the exhaust butterfly valve actuator.

If the reading is in specification, remove the ECU and check the wiring for continuity between main harness connectors.

Special Tool - Hand Tester: 57001-1394

○Disconnect the ECU and actuator connectors.

Wiring Continuity Inspection

ECU Connector [A] ←→

Exhaust Butterfly Valve Actuator Connector [B]

GY lead (ECU terminal 3) [C]

G/R lead (ECU terminal 4) [D]

If the wiring is good, 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 (see ECU Removal/Installation).

FUEL SYSTEM (DFI) 3-99

Exhaust Butterfly Valve Actuator (Service Code 63)

Exhaust Butterfly Valve Actuator Circuit

1.Exhaust Butterfly Valve Actuator

2.ECU