Component description for the exhaust gas recirculation pressure transducer - GF14.20-P-2010BK

WARNING: This page does not describe the selected car, but rather 28 other vehicles, including the 2012 Mercedes-Benz GL550, 2012 Mercedes-Benz GL450, 2011 Mercedes-Benz ML63, 2011 Mercedes-Benz ML550, and 2011 Mercedes-Benz ML350. However, it is still accessible from the selected car via links, so may be relevant.

ENGINE 113.967 in MODEL 219

ENGINE 113.964 in MODEL 164.1

ENGINE 113.971 in MODEL 251

Fig 1: Identifying Throttle Valve Actuator And EGR (ARF) Vacuum Transducer

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Location

The EGR [ARF] vacuum transducer is mounted behind the right cylinder head.

Task

The EGR pressure transducer controls the vacuum pressure to the EGR valve.

Design

The EGR pressure transducer is an electromagnetic proportioning valve.

Fig 2: Cross Sectional View Of EGR Pressure Transducer

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Function

From connection VAC the intake manifold vacuum reaches the pressure regulator, which stabilizes the intake manifold vacuum in line with engine speed and throttle valve position via a control valve to approx. -200 mbar.

The controlled vacuum flows further via a hose line to the following electric unit.

This unit is actuated by the ME control unit with a pulse width modulation signal (frequency approx. 10 Hz, on/off ratio approx. 30 to 100%) at the ground end.

The developing magnetic field influences via the coil anchor the valve unit as follows:

No signal from control unit:

The connections OUT and ATM are linked. The exhaust gas recirculation valve is close (ventilated).

Signal from control unit:

The valve unit opens in proportion to the current flow in the coil. The vacuum acts partially or fully at connection OUT and operates the ERF valve accordingly.