Checking regulator and alternator - AR15.40-P-5000SX

ENGINE 156, 272, 273, 275, 629, 642 in MODEL 221 

ENGINE 156, 273, 275 in MODEL 216 

Fig 1: Checking Regulator And Alternator Using Diagnostic Connector

Courtesy of MERCEDES-BENZ USA

	Checking
	Risk of explosion  caused by oxyhydrogen gas. Risk of poisoning and caustic burns  caused by swallowing battery acid. Risk of injury  caused by burns to skin and eyes from battery acid or when handling damaged lead-acid batteries	No fire, sparks, open flames or smoking. Wear acid-resistant gloves, clothing and glasses. Only pour battery acid into suitable and appropriately marked containers.	AS54.10-Z-0001-01A
	Notes on avoiding damage to electronic components due to electrostatic discharge		AH54.00-P-0001-01A
	Notes on battery		AH54.10-P-0001-01A
1	Check battery status	Determine findings and replace faulty battery if necessary.	AR54.10-P-1129SX
2	Connect up STAR DIAGNOSIS (0100) to data link connector (X11/4).	STAR DIAGNOSIS diagnosis system
	Connect STAR DIAGNOSIS		AD00.00-P-2000-04A
	Risk of accident  caused by vehicle starting off by itself when engine is running. Risk of injury  caused by contusions and burns during starting procedure or when working near the engine as it is running	Secure vehicle to prevent it from moving by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts.	AS00.00-Z-0005-01A
3	Check alternator using STAR DIAGNOSIS (0100)	Only perform tests when engine at its normal operating temperature. Tests are menu-assisted: Engine control unit Actuations Alternator diagnosis
4	Disconnect STAR DIAGNOSIS (0100).