Air (Switch) Vent Solenoid Valve

Inspect solenoid and spring. Disconnect solenoid connector. See Fig 1 . Apply 12 volts and check if solenoid valve operates smoothly. If solenoid does not operate smoothly, air horn assembly must be replaced. Inspect air horn surface for distortion, scratching or other damage. Replace if damaged.

Fig 1: Checking Air (Switch) Vent Solenoid

Courtesy of ISUZU MOTOR CO.