IA12 - High Speed Inlet Air (HSIA) Control Solenoid

^ Connect a Rotunda 88 Digital Multimeter 105-00053 or equivalent as a tachometer to measure the engine speed.

^ Run the engine until it is thoroughly warmed up.

^ Noting the position of the shutter valve lever and actuator, increase the engine speed to 5000 rpm.

^ Does the shutter valve begin to open at approximately 5000 rpm?

YES -- Return to PROCEDURES /DIAGNOSIS BY SYMPTOM. Symptom Related Diagnostic Procedures

NO -- Go to COMPUTERS AND CONTROLS /TESTING AND INSPECTION /PPT SCG, which covers the High Speed Inlet Air (HSIA) control solenoid for further diagnosis and testing.