In this video I show you how to test the variable intake manifold system when there P0660 fault code on engine. I explain the variable intake system operation, I show you how to test this system with scan tool, I also show you how to test it with a battery if you don’t have a scan tool. Then I explain how to test the VIS solenoid itself and how to test the wiring. Video timeline: 00:15 Variable Intake Manifold System (VIS) introduction 02:43 Test Variable Intake Manifold with Scan tool 04:04 Test Variable Intake Manifold without Scan tool (With battery) 05:08 Test the VIS wiring 06:36 Test VIS Valve with Multimeter