The P0075 diagnostic trouble code for a 2008 Nissan Altima refers to an issue with the Intake Valve Control Solenoid Circuit (Bank 1). This code is for the intake manifold tumbler valve actuator.
The tumble generator valves are controlled by the ECM according to the
coolant temperature and the time elapsed after start of the engine.
When the engine is started, the butterfly valves are moved to the closing
position. In this state, the intake air flows at very high speeds passing
through a narrowed passages in the cylinder Head.
This creates tumbling air motions in the cylinders, which enables
lean mixtures to be ignited and thus harmful exhaust emissions to be
reduced during engine start.
The tumble generator valves will fully open when the engine is at operating
temperature or if the throttle is depressed at any time during warm up it
will disengage the tumble valve, and the valve will move to the open
position until the next cold start up.
The valve is located on the intake manifold on the opposite side of the throttle body. I believe it has a vacuum line which I would check. I have also seen the runner control get gummed up and stop working in which case the intake will need to be removed and cleaned.
Check out the images (below). Please let us know what happens.
Feb 20, 2024 at 11:56 AM
