Genuine BMW 335i Throttle Body

BMW 335i Throttle Body Parts Questions & Experts Answers

• Throttle Body
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  Q: How to replace the Throttle Body housing in the N55 six-cylinder engine on BMW 335i?

  A:

  The accelerator pedal is not mechanically connected to the throttle plate as the accelerator pedal module sends the position of the pedal using two variable voltage signals from Hall sensors to the ECM. In return, the ECM offers a 5V signal and ground for each sensor, while the sensors themselves are asked to produce a proportional voltage value, across the entire pedal travel range from the fully relaxed state to full throttle. Hall sensor 1 operates at a voltage of 0.5 to 4.5 volts while Hall sensor 2 operates at a voltage of 0.5 to 2.5 volts. This unit either the throttle housing or the case is non adjustable and hence has to be replaced in its entirety if damaged. Upon replacement, adaptation values must be reset with a BMW scan tool or equivalent since failure to perform it results in the non-starting of the engine. The procedure requires putting off the ignition, the air filter housing and ducts and disconnecting the charge air ducts. To disassemble the tank vent valve it is required to disconnect the electrical connector as well as the vent lines. When working in throttle assembly area, electrical connection should be disconnected, and some bolts off so that part of throttle housing can be slightly opened to allow disconnecting the vent line. Installation is done in the same sequence, paying much attention to the manner in which the throttle assembly connector is connected since any twisting on the harness tends to damage the entire harness set up. A profile gasket must be replaced between the throttle assembly and Intake Manifold and, after reinstalling the unit, it is necessary to check for fault codes and to reset ECM memory also specific adaptation values for the throttle plate, as directed by on-screen prompt.