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

Model 166, 207, 212, 218, 292 

Courtesy of MERCEDES-BENZ USA

Shown on MODEL 212 up to model year 2014 with CODE 233 (DISTRONIC PLUS) 

	Risk of poisoning  from swallowing brake fluid. Risk of injury  from skin and eye contact with brake fluid	Only pour brake fluid into suitable and appropriately marked containers. Wear protective clothing and eye protection when handling brake fluid.	AS42.50-Z-0001-01A
	Notes on repairs to brake system		AH42.00-P-0003-01A
	Information on preventing damage to electronic components due to electrostatic discharge		AH54.00-P-0001-01A
	Brake fluid notes		AH42.50-P-0001-01A
	Remove/install
1	Switch off ignition and keep transmitter key at a location beyond transmitter range (at least 2 m)
2	Open engine hood	Model 166	AR88.40-P-1000GQ
		Model 207, 212	AR88.40-P-1000EW
3	Remove the left engine intake air duct	Model 207 with engine 272, 273, 642 up to model year 2015 Model 212 with engine 156, 272, 273, 642 up to model year 2015 Model 218 with engine 157, 642 up to model year 2015
	Clean
4	Clean the area surrounding the electrical connection (2) for the ESP® control unit (1)	Clean thoroughly with clean, lint-free rag and assembly cleaner only. Otherwise, even the smallest particles of dirt introduced into the ESP® control unit (1) can lead to malfunctions and a total failure of the brake system.
5	Disconnect electrical connector (2)	Model 207, 212, 218
		Model 207, 212 up to model year 2014 with code 233 (DISTRONIC PLUS) Model 218 up to model year 2015 with code 233 (DISTRONIC PLUS)	AR42.45-P-0820-02EWD
		Model 207, 212 as of model year 2014 Model 207, 212 up to model year 2014 except code 233 (DISTRONIC PLUS) Model 218 as of model year 2015 Model 218 up to model year 2015 except code 233 (DISTRONIC PLUS) Observe instructions on disconnecting. Otherwise the locking mechanism may be damaged. Do not touch, deform or damage contacts of connector and jack. Otherwise the function may be impaired. Do not allow any foreign objects, dirt or fluids to enter the jack or connector. Otherwise, the function of the brake system may be impaired.	AR42.45-P-0820-02EW
		Model 207, 212 as of model year 2014 Model 207, 212 up to model year 2014 except code 233 (DISTRONIC PLUS) Model 218 as of model year 2015 Model 218 up to model year 2014 with code 233 (DISTRONIC PLUS) Unlocking tool	Fig 1
6	Unclip bracket (6) from washer fluid reservoir	Model 212 up to model year 2015
7	Remove bolts (3)	Use exact specified tightening torques only. Too large tightening torques result in damage to the ESP® control unit (1), too small tightening torques result in poor connection in the contact areas. The screws/bolts (3) must be replaced.
		Model 166, 292Screw/bolt, ESP® control unit to traction system hydraulic unit	*BA42.45-P-1005-01J
		Model 207, 212, 218Screw/bolt, ESP® control unit to traction system hydraulic unit	*BA42.45-P-1002-01M
8	Detach ESP® control unit (1) from hydraulic unit (7)	Do not touch contact areas and sealing silicone on the ESP® control unit (1) by hand or with a tool. Otherwise, damage and leaks may occur.
9	Disconnect electrical connector (2)	Model 166, 292 with code 233 (DISTRONIC PLUS) Model 207, 212 up to model year 2014 with code 233 (DISTRONIC PLUS) Model 218 up to model year 2015 with code 233 (DISTRONIC PLUS)	AR42.45-P-0820-02EWD
		Model 166, 292 except code 233 (DISTRONIC PLUS) Model 207, 212 as of model year 2014 Model 207, 212 up to model year 2014 except code 233 (DISTRONIC PLUS) Model 218 as of model year 2015 Model 218 up to model year 2015 except code 233 (DISTRONIC PLUS) Observe instructions on disconnecting. Otherwise the locking mechanism may be damaged. Do not touch, deform or damage contacts of connector and jack. Otherwise the function may be impaired. Do not allow any foreign objects, dirt or fluids to enter the jack or connector. Otherwise, the function of the brake system may be impaired.	AR42.45-P-0820-02EW
		Model 166, 292 except code 233 (DISTRONIC PLUS) Unlocking tool	Fig 1
10	Remove ESP® control unit (1) from engine compartment
11	Remove O-rings (4) from valve dome (5) by hand	Do not use tools. Otherwise, the hydraulic unit (7) will be damaged.
	Clean
12	Clean sealing surface on hydraulic unit (7)
13	Install in the reverse order
14	Calibrate ESP® control unit (1) using diagnostic system	When replacing ESP® control unit (1).
			AD00.00-P-2000-04A
15	Connect diagnostic system, read out fault memory and clear
			AD00.00-P-2000-04A

Fig 1: Identifying Unlocking Tool (000 589 20 63 00)

Courtesy of MERCEDES-BENZ USA