on the side of the intake manifold. opposite side of the throttle body
Intake manifold tuning control circuit low (bank 1)
Trouble code P0662 means: Intake manifold tuning valve control circuit high (bank 1)
According to my code reader "P0660 intake manifold tuning valve control circuit open bank 1"
Trouble code P0661 means:Intake manifold tuning valve control circuit low (Bank 1)
If you mean PO660 it is Intake Manifold Tuning Valve circuit Malfunction. Click the link.
P-1078: Powertrain - Manufacturer Controlled DTC - Manufacturer Controlled Area: Intake manifold tuning valve system malfunction - high RPM Diagnosis: Hose leak/blockage, wiring, intake manifold tuning valve, intake manifold tuning valve actuator, ECM Probably not repairable by the owner.
Trouble code P0661 means:Intake manifold tuning valve control circuit low (Bank 1)
Its called an "Intake Manifold Tuning Valve". Its function is to join or separate the two sides of the intake manifold. It has a minor effect on engine performance. It can be difficult or impossible to remove.
Variable geometry or two-stage intake manifolds are used to optimize the torque at all engine speeds by directing the intake air to different length runners. A manifold tuning valve (MTV) is the control mechanism that accomplishes this by directing air at low speed through long runners and air at high speed through short runners. The MTV actuation is through an electric motor / rotary solenoid controlled by the engine controller through a relay. Hope this helps! Jay
An intake manifold directs air (air/fuel mixture on carburated engines) to the cylinder head. Depending on the runner length/diameter it can boost torque in a certain rpm range known as "manifold tuning". For example short runners works better for high rpm engines versues a long runner manifold, which is better for low/mid range power.
You can tell when a manifold tuning valve is bad when oil is leaking through it. You also can tell by inserting the dipstick into the valve and seeing if oil comes out through the dipstick.
Try Clifford Research.