Test Alternator Charging Current - AR15.40-P-5011CW

Engine 156, 271, 272, 273, 642, 651 in model 212 

Engine 156, 271, 272, 274, 642, 646, 651 in model 204 

Engine 271 in model 172 

Engine 271, 272, 273, 642, 651 in model 207 

Engine 274 in model 172 

Engine 274 in model 205 (except 205.047/147/247) 

Engine 274 in model 253 (except 253.954) 

Engine 642, 651 in model 218 

Connection scheme, shown on model 204.002 

Courtesy of MERCEDES-BENZ USA

	Risk of death  when working on component parts and systems with U > = 30 V alternating voltage (AC) or U > = 60 V direct voltage (DC)	Do not touch damaged or defective live component parts and lines or non-insulated electrical connections and lines.	AS00.00-Z-0035-01A
	Risk of death  caused by vehicle slipping or toppling off of the lifting platform.	Align vehicle between vehicle lift columns and position the four support plates at the vehicle lift support points specified by the vehicle manufacturer.	AS00.00-Z-0010-01A
	Check
1	Check tension of the poly-V belt and tension if necessary
2	Check poly-V belt for wear	Engine 156, 271, 272, 273, 642, 651 in model 212	AP13.22-P-1352CW
		Engine 156, 271, 272, 274, 642, 646, 651 in model 204 Engine 271, 272, 273, 642, 651 in model 207 Engine 642, 651 in model 218 Engine 274 in model 205 (except 205.047/053/054/147/247/253) Engine 274 in model 253 (except 253.353/354/953/954)	AP13.22-P-1352EW
		Engine 271, 274 in model 172	AP13.22-P-1352V
3	Check electrical lines to on-board electrical system battery (G1), alternator (G2), starter (M1) and on the ground point for the battery at the front right (W10) for tight seating and check for a perfect condition
4	Check function of freewheel of belt pulley for alternator (G2) and replace if necessary	If installed.
5.1	Remove Engine compartment paneling	Engine 156, 271 in model 204.3 Engine 156, 271, 272 in model 204.0/2 Engine 156, 271, 272, 273 in model 212 Engine 271, 272, 273 in model 207 Engine 271, 274 in model 172 Engine 272, 274, 642, 651 in model 204.9 Engine 274 in model 205 (except 205.047/147/247) Engine 274 in model 253 (except 253.954)	AR61.20-P-1105W
		Engine 156, 271 in model 204.3 Engine 156, 271, 272 in model 204.0/2 Engine 156, 271, 272, 273 in model 212 Engine 271, 272, 273 in model 207	AR61.20-P-1105EW
		Engine 272, 274, 642, 651 in model 204.9	AR61.20-P-1105CY
		Engine 274 in model 205 (except 205.047/147/247) Engine 274 in model 253 (except 253.954)	AR61.20-P-1105LW
5.2	Remove bottom sections of soundproofing	Engine 642, 646, 651 in model 204.0/2 Engine 642, 651 in model 207, 212, 218 Engine 651 in model 204.3 Engine 642, 646, 651 in model 204.0/2 Engine 642, 651 in model 207 Engine 642, 651 in model 212 Engine 642, 651 in model 218 Engine 651 in model 204.3	AR94.30-P-5300EW
6	Check ground strap between Engine and body for tight seating and proper condition and repair if necessary
7	Connect up load tester (079) with current clamp (065) according to connecting diagram 000 588 03 19 00 Load tester
			WS15.00-P-0027B
	Risk of accident  from vehicle starting off by itself when Engine running. Risk of injury  (bruises and burns) resulting from working on the Engine while it is being started or when it is running.	Secure vehicle to prevent it from starting off by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts.	AS00.00-Z-0005-01A
8	Start Engine	For vehicles as of 1.6.10, open the driver door so that the alternator management changes over into workshop mode.
9	Check charging current at fast rpms, whereby the on-board electrical system battery (G1) is loaded with the load tester (079)	Engine 156 in model 204, 212 Engine 271 in model 172 except code B03 (ECO start/stop function) Engine 271 in model 172 with code B03 (ECO start/stop function) Engine 271 in model 204, 207 except code 910 (Alternator, with higher capacity) Engine 271 in model 204, 207 with code 910 (Alternator, with higher capacity) Engine 271 in model 212 Engine 272 in model 204.05/06/25, 207 Engine 272 in model 204.08/95/98, 212 Engine 273 in model 207, 212 Engine 274 in model 204 except code 824 (Add.parts for countries w.low temperatures) Engine 274 in model 204 with code 824 (Add.parts for countries w.low temperatures) Engine 642 in model 204, 207, 218 Engine 642 in model 212 except code 460 (Canada version) except code 494 (California version) except code 498 (Japanese version) except code U42 (BlueTEC diesel exhaust treatment (SCR)) Engine 642 in model 212 with code 460 (Canada version) with code 494 (US version) with code 498 (Japanese version) with code U42 (BlueTEC diesel exhaust treatment (SCR)) Engine 646 in model 204 Engine 651 in model 204.0/2/3 except code 401 (Climatised front seats) except code 873 (Left and right driver's seat heating) Engine 651 in model 204.0/2/3 with code 401 (Climatised front seats) with code 873 (Left and right driver's seat heating) Engine 651 in model 204.9, 212, 218 Engine 651 in model 207Charging current for alternator Charging current below specified value ↓ Check diodes of alternator	*BE15.40-P-1001-01L
		Engine 156, 271 in model 212 Engine 156, 271, 272, 274, 642, 646, 651 in model 204 Engine 271, 272, 273, 642, 651 in model 207 Engine 271, 274 in model 172 Engine 642, 651 in model 218	AR15.40-P-9301-02CW
		Engine 272, 273, 642, 651 in model 212	AR15.40-P-9301-02EW
10	Stop Engine and switch off ignition
11	Clamp off load tester (079) with current clamp (065)
12	Replace alternator (G2)	If the charging current deviates from the specified value or diodes on the alternator (G2) are defective.
		Engine 274 in model 204	AR15.40-P-5032MR
		Engine 156 in model 204, 212	AR15.40-P-5032CMG
		Engine 271 in model 172, 204, 207, 212	AR15.40-P-5032CW
		Engine 272 in model 204 Engine 272, 273 in model 207	AR15.40-P-5032CV
		Engine 272, 273 in model 212	AR15.40-P-5032EW
		Engine 642 in model 204 (except 204.08/28/98)	AR15.40-P-5032CO
		Engine 642 in model 204.08/28/98	AR15.40-P-5032CWX
		Engine 642 in model 207, 212, 218	AR15.40-P-5032OGE
		Engine 646 in model 204	AR15.40-P-5032CWI
		Engine 651 in model 204, 207, 212 (except 212.098/298), 218	AR15.40-P-5032CD
		Engine 651.9 in model 212.098/298	AR15.40-P-5032EH
		Engine 274.9 in model 205 (except 205.047/147/247), 253 (except 253.954)	AR15.40-P-5032LWA
13.1	Install lower Engine compartment paneling	Engine 156, 271 in model 204.3 Engine 156, 271, 272 in model 204.0/2 Engine 156, 271, 272, 273 in model 212 Engine 271, 272, 273 in model 207 Engine 271, 274 in model 172 Engine 272, 274, 642, 651 in model 204.9 Engine 274 in model 205 (except 205.047/147/247) Engine 274 in model 253 (except 253.954)
			AR61.20-P-1105W
		Engine 156, 271 in model 204.3 Engine 156, 271, 272 in model 204.0/2 Engine 156, 271, 272, 273 in model 212 Engine 271, 272, 273 in model 207	AR61.20-P-1105EW
		Engine 272, 274, 642, 651 in model 204.9	AR61.20-P-1105CY
		Engine 274 in model 205 (except 205.047/147/247) Engine 274 in model 253 (except 253.954)	AR61.20-P-1105LW
13.2	Install bottom sections of soundproofing	Engine 642, 646, 651 in model 204.0/2 Engine 642, 651 in model 207, 212, 218 Engine 651 in model 204.3 Engine 642, 646, 651 in model 204.0/2 Engine 642, 651 in model 207 Engine 642, 651 in model 212 Engine 642, 651 in model 218 Engine 651 in model 204.3	AR94.30-P-5300EW