FixVault

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
G10108548Courtesy of MERCEDES-BENZ USA
INSPECT Checking     
DANGER Risk of explosion  caused by escaping oxyhydrogen gas. Risk of injury  caused by caustic burns to eyes, skin and mucous membranes from battery electrolyte (contains diluted sulfuric acid) or metal spatter due to short circuit. Risk of burn injuries  caused by short circuit. Risk of poisoning  caused by swallowing battery electrolyte (contains diluted sulfuric acid) or absorption of lead over the skin or orifices No fire, sparks, open flames or smoking. Wear acid-resistant gloves and clothing and safety glasses with side guards.
Do not place any conductive objects on the battery and avoid any short circuit from battery positive to ground.
Only fill liquid battery electrolyte (diluted sulfuric acid) into suitable and appropriately marked containers.
AS54.10-Z-0001-01A
NOTES Notes on avoiding damage to electronic components due to electrostatic discharge   AH54.00-P-0001-01A
NOTES Notes on battery   AH54.10-P-0001-01A
1 Check battery status IMPORTANT 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  
REFER TO SELF-DIAGNOSTIC SYSTEMS Connect STAR DIAGNOSIS   AD00.00-P-2000-04A
DANGER 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) IMPORTANT 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).