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Remove/install injection system control unit - AR07.08-P-7008CDA

ENGINES 651 in MODELS 166, 172, 204, 207, 212, 218, 221 

Fig 1: Injection System Control Unit Remove/Install Components
G09974652Courtesy of MERCEDES-BENZ USA
REMOVINGINSTALLING Remove/install     
NOTES Information on preventing damage to electronic components due to electrostatic discharge   AH54.00-P-0001-01A
1 Connect Star Diagnosis and perform commissioning of the CDI control unit (N3/9) IMPORTANT When replacing the ME-SFI [ME] control unit (N3/9). AD00.00-P-2000-04A
2 Disconnect ground line at the on-board electrical system battery IMPORTANT Insulate ground line to prevent unintentional contact between detached ground line and battery ground point.
Model 166
AR54.10-P-0003GZ
Model 172 AR54.10-P-0003W
Model 204 AR54.10-P-0003CW
Model 207, 212, 218 AR54.10-P-0003EW
Model 221.0/1 AR54.10-P-0003SX
3 Remove cylinder head cover trim    
4 Unlock electrical connectors (1) for engine wiring harness (2) and detach from CDI control unit (N3/9)    
5 Unhook engine wiring harness (2) on CDI control unit (N3/9)    
6 Remove screws/bolts (3)    
7 Remove CDI control unit (N3/9)    
8 Install in the reverse order    
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
9 Carry out engine test run