Remove/Install Motor Control Unit Of Electrical Power Steering (ES) - AR46.20-P-0701MFA

Model 118, 177, 247 

Shown on model 177.0 

Fig 1: Motor Control Unit Of Electrical Power Steering (ES) Components Location - Model 247 (Shown On Model 177.0)

Courtesy of MERCEDES-BENZ USA

Courtesy of MERCEDES-BENZ USA

	Risk of injury  . Skin or eye injuries may result when handling hot or glowing objects.	Wear protective gloves, protective clothing and safety glasses, if necessary.	AS00.00-Z-0002-01A
	Risk of injury  . Moving parts can pinch, crush or, in extreme cases even sever extremities.	No parts of the body or limbs should be within the operating area of mechanical components when moving components.	AS00.00-Z-0009-01A
	Risk of injury  caused by scraping or cutting body parts on sharp vehicle parts	Always wear protective gloves when working on or near sharp and non-deburred vehicle parts. Deburr repair panels.	AS00.00-Z-0017-01A
Notice	Information on preventing damage to electronic components due to electrostatic discharge		AH54.00-P-0001-01A
	Notes on repair work on suspension components		AH00.00-P-0100-01A
	Remove/install
1	Turn front wheels to straight-ahead position and fix steering wheel at center position.	Retainer device	Fig 2
2	Switch off ignition and store transmitter key outside of transmission range (min. 2 m).
3	Remove lower engine compartment lining.	Model 118, 177, 247 with engine 260 with code M016 (Uprated engine) Model 118, 177, 247.7 with engine 139	AR61.20-P-1105MFR
		Model 118, 177, 247 with engine 260 except code M016 (Uprated engine) Model 118, 177, 247 with engine 282	AR61.20-P-1105MFA
		Model 118, 177, 247 with engine 608, 654	AR61.20-P-1105MFE
4	Release and disconnect electrical connections (1).
5	Remove screws (2).	Replace screw/bolts (2).
		Bolt, motor controller unit (ES) to rack-and-pinion steering	*BA46.20-P-1003-01T
6	Remove electric power steering actuator motor (A91m1).	Replace sealing ring (3). Ensure that the sealing ring (3) is seated correctly.
7	Protect rack-and-pinion steering and electric power steering actuator motor (A91m1) against soiling using lint-free rags.	Soiling on the inside will result in destruction of the rack-and-pinion steering or the electric power steering actuator motor (A91m1).
	Check
8	Check damper coupling (4) for damage.	Check that the damper coupling (4) is correctly seated. If damage is found, ↓ Replace electric power steering actuator motor (A91m1).
9	Install in the reverse order.
	Initial startup
10	Slowly turn steering wheel to and fro out of center position by 2°.	Release torsion bar in steering gear before calibration.
11	Calibrate torque sensor of electric power steering actuator motor (A91m1).	When replacing electric power steering actuator motor (A91m1).
			AD00.00-P-2000-06MFA
		Do not perform any work on the vehicle during the adjustment process. Otherwise, the adjustment may be negatively influenced.

STEERING GEAR

Number	Designation		Model 118, 177, 247
BA46.20-P-1003-01T	Bolt, motor controller unit (ES) to rack-and-pinion steering	Nm	19

Fig 2: Identifying Retainer Device (129 589 01 21 00)

Courtesy of MERCEDES-BENZ USA