BMW 13411744713 T-Shape Idle Regulating Valve

The Idle Control Valve, located directly above the throttle housing, regulates idle speed by redirecting air around the throttle valve and is powered by battery voltage from the DME main relay, featuring a two-coil rotary actuator with pulsed coil grounds from the ECM to adjust the duty cycle for the desired idle speed. A malfunctioning valve triggers a diagnostic trouble code (DTC), and the malfunction indicator lamp (MIL) activates if the OBD fault criteria are met. To address this, first switch off the ignition and remove the key, then disconnect the negative battery cable in the cargo compartment, ensuring to read the battery disconnection cautions beforehand. Next, remove the air filter housing and intake ducts, disconnect the electrical connectors to the intake manifold resonance valve and Idle Control Valve, and take out the upper wiring harness housing mounting fastener while slightly pulling back the harness housing. Remove the screws securing the Idle Control Valve mounting bracket and pull the idle regulator off the intake manifold, replacing the rubber grommet during reinstallation by coating it with assembly lubricant before pressing it back into place. Finally, reattach the wiring harnesses, reinstall the air filter assembly and ducts, and check and clear any fault codes from the ECM memory.

The Idle Control Valve, controlled by the Engine Control Module (ECM), maintains a steady idle speed during engine warm-up and when using the air conditioner. It functions as a controlled air bleed, bypassing air around the closed throttle valve. The Idle Control Valve can be tested with diagnostic equipment or a digital ohmmeter. Replacement depends on the engine model.

The Idle Control Valve is positioned just above the throttle housing and controls the idle speed by drawing air by-pass round the throttle valve and is supplied with battery voltage from the DME main relay. There is only a two-coil rotary actuator; the ground sides of each coil are pulsed by the ECM, with variable duty cycle to achieve the desired idle speed. An abnormal valve results in an OTC and if the OBD II fault parameters are met, the MIL comes on. First, remove the battery cables where they enter the cargo compartment, and, having read the battery disconnection cautions first, pull the negative one. Subsequently, it will be necessary to pull off the whole air filter housing and the air intake ducts. On the side of the intake manifold, remove the electrical connector plugs for both intake manifold resonance valve and for the Idle Control Valve. Take off the upper wiring harness housing mounting fastener and move the harness housing backward slightly. Next, the Idle Control Valve mounting bracket screws are removed, as is the idle regulator coupled to the intake manifold via a rubber grommet that also acts as a vacuum gasket. After that, the Idle Control Valve must be pressed into the manifold; on it, the rubber grommet is put on, and the inside must be coated with assembly lubricant. Last of all, reconnect the wiring harnesses and replace the air filter assembly and ducts on the vehicle and read the codes from the ECM and clear and reset its memory.

This valve functions as a controlled air bleed, bypassing varying amounts of air around the closed throttle valve to maintain the idle speed.