Special Tool - Hand Tester: 57001-1394
Exhaust Butterfly Valve Actuator Resistance
Connections: P lead ←→ GY lead
Standard: 5 
200 Ω (for reference)
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.
Disconnect the ECU and actuator connectors.
Wiring Inspection ECU Connector [A] ←→ Exhaust Butterfly Valve Actuator Connector [B] W/R lead (ECU terminal 45) [C] W/BL lead (ECU terminal 46) [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).
Exhaust Butterfly Valve Actuator Circuit
1. ECU
2. Exhaust Butterfly Valve Actuator
Exhaust Butterfly Valve Actuator Inspection
Air Switching Valve (Service Code 64)Stick Coil Input Voltage Inspection
NOTE
Be sure the battery is fully charged.
Turn the ignition switch to OFF.
Remove the ECU (see ECU Removal in the Fuel System
(DFI) chapter).
Do not disconnect the ECU connectors.
Connect a digital meter [A] to the connector [B] with the
needle adapter set.
Special Tool - N ...
Fuse Inspection
Remove the fuse.
Inspect the fuse element.
If it is blown out, replace the fuse. Before replacing a
blown fuse, always check the amperage in the affected
circuit. If the amperage is equal to or greater than the
fuse rating, check the wiring and related components for
a short circuit.
...
KIBS Equipped Models
1. Clutch Cable
2. Vacuum Hose (Equipped Models)
3. Left Switch Housing Lead
4. Main Harness
5. Front Brake Hose
6. Throttle Cables
7. Right Switch Housing Lead
8. Bracket (Hold the brake pipes.)
9. Run the meter lead to outside of the meter bracket.
10. Run the vacuum hoses to inside o ...