Remove/Install Electronic Stability Program (ESP) Control Unit - AR42.45-P-0820CW

Model 204, 172 

Courtesy of MERCEDES-BENZ USA

Shown on Model 204 

	Remove/install
	Information on preventing damage to electronic components due to electrostatic discharge		AH54.00-P-0001-01A
1	Switch off ignition and remove transmitter key or KEYLESS-GO start/stop button from electronic ignition lock control unit	KEYLESS-GO start/stop button only on vehicles with code (889) Keyless-Go.
	Clean
2	Clean area surrounding electrical connector (1) and Electronic Stability Program control unit (N30/4)	Before opening the Brake system the area around the separation point should be cleaned thoroughly. Even the smallest particles of dirt, introduced into the hydraulic components, can lead to malfunctions and a total failure of the Brake system. Only use clean, lint free rags and cleaner free of mineral oil. Do not use any compressed-air for cleaning when the Brake system is open. Cleaner from package	*BR00.45-Z-1028-04A
3	Disconnect electrical connector (1) from Electronic Stability Program control unit (N30/4)	It is essential to precisely follow the work instructions for disconnecting the electrical connector (1). The locking mechanism can otherwise be damaged. Do not touch, deform or damage the contacts of the electrical connector (1) and of the jack on the Electronic Stability Program control unit (N30/4). Do not allow foreign objects, dirt or fluids to enter the jack or electrical connector (1). The Electronic Stability Program control unit (N30/4) can otherwise be damaged or malfunction.	AR42.45-P-0820-02CW
4	Remove the left engine intake air duct	Model 204 with engine 156
5	Detach heat shield from traction system hydraulic unit (A7/3)	Model 204 with engine 156
6	Remove Bolts (2)	: Replace Bolts (2). Use 70 mm long Torx-bit T20	*BA42.45-P-1002-01M
7	Detach Electronic Stability Program control unit (N30/4) from traction system hydraulic unit (A7/3) and remove	Do not touch the contact surfaces and silicon seal of the Electronic Stability Program control unit (N30/4) with your hands or with tools. The Electronic Stability Program control unit (N30/4) will otherwise be damaged.
8	Remove O-rings (3) of the valve dome (4) by hand	Do not use tools to remove the O-rings (3). The traction system hydraulic unit (A7/3) will otherwise be damaged.
	Clean
9	Clean sealing surface on traction system hydraulic unit (A7/3)		*BR00.45-Z-1028-04A
10	Install in the reverse order
11	Connect Star Diagnosis and perform calibration of Electronic Stability Program control unit (N30/4)	When installing a new Electronic Stability Program control unit (N30/4).	AD00.00-P-2000-04A

ELECTRONIC STABILITY PROGRAM (ESP)

Number	Designation		Model 172	Model 204
BA42.45-P-1002-01M	Bolt, ESP control unit to traction system hydraulic unit	Nm	2	2

REPAIR MATERIALS

Number	Designation	Order number
BR00.45-Z-1028-04A	Cleaner from package	Adolf Wurth GmbH & Co. KG Reinhold-Wurth-Str. 12-17 74653 Kunzelsau-Gaisbach Germany Tel. +49 7940 15-0 Fax +49 7940 15-1000 www.wuerth.de