Mercedes Benz W211 Diagnostics Problems

Introduction

See also Mercedes Benz diagnostics obd

See https://charm.li/Mercedes%20Benz/2003/E%20320%20Wagon%20%28211.265%29%20V6-3.2L%20%28112.949%29/

Airmatic

• 

  Problems do persist. Problem: 5343 y36/4

Problem: 5343 y36/4

Airmatic is controlled by the N51 Air Suspension Control Module. Useful diagnostics include ride height sensor values, compressor activation, valve block actuation, reservoir pressure, corner pressures, compressor runtime, calibration, fault memory. Generic OBD-II exposes none of this. Mercedes DAS/Xentry exposes essentially all of it.

Check AIRmatic for leaks pdf file

• Y36/6: AIRMATIC valve unit
• Y36/6b1 AIRMATIC pressure sensor
• Y36/6y1 Left front level control valve
• Y36/6y2 Right front level control valve
• Y36/6y3 Left rear level control valve
• Y36/6y4 Right rear level valve
• Y36/6y5 AIRMATIC central reservoir filling valve

Good discussion: https://mbworld.org/forums/e-class-w211/918482-self-leveling-rear-suspension.html

• Eg: Control unit is under the passenger footwell (the carpet up, remove nuts to pull the steel plate). Check this: https://mbworld.org/forums/e-class-w...ml#post8748801 Only relay is for the pump, it's in the engine bay, fuse box on the drivers side corner. Fuse #45 is for the control unit, diagram for fuses is here: https://fuse-box.info/mercedes-benz/..._box_diagram-3
• Checked Voltage on rear level sensor and it goes from 2.8 to 4.9 and it’s on 4.9 when it’s dropped, using a jack.
• the leveling sensor in the rear was on the middle of the sway bar! (kallistuksenvakaaja)