3-100 FUEL SYSTEM (DFI)

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 Unit Test in the Electrical System chapter.

If the air switching valve is normal, check the wiring for continuity, using the wiring diagram in this section.

Special Tool - Hand Tester: 57001-1394

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).

Air Switching Valve Circuit

1.Ignition Switch

2.Engine Stop Switch

3.Air Switching Valve

4.ECU

5.Fuel Pump

6.Fuse Box

7.Ignition Fuse 15 A

8.Frame Ground

9.Battery 12 V 8 Ah

10.Main Fuse 30 A

11.Fuel Pump Relay

12.Relay Box