Intake Manifold Change-Over, Checking

Intake Manifold Change-Over, Checking

- Remove front engine cover (arrows).





- Start engine and increase engine speed to well above 4200 rpm.

• The operating rods of the actuator for the intake manifold (arrow) must move





If the change-over is not taking place, perform the following tests:

- Check intake manifold change-over valve (N156 ) (perform final control diagnosis. Refer to => [ Output Diagnostic Test Mode ] Output Diagnostic Test Mode, if necessary, check valve and actuation => [ Intake Manifold Change-Over Valve, Checking ] Intake Manifold Change-Over Valve, Checking or => [ Checking actuation ] Intake Manifold Change-Over Valve, Checking).

- Checking vacuum system for leaks. Refer to => [ Vacuum System, Checking ] Vacuum System, Checking.

- Check that vacuum hoses are properly connected and free of leaks and obstructions.

- Check that change-over mechanism operates freely (move push rod by hand).