Disconnect/Connect Engine Wiring Harness To Remove Cylinder Head Cover - AR15.18-P-1000-04MRD

Engine 274.9 in model 213 

Engine 274.9 in model 238 

Shown on ENGINE 274.920 in MODEL 213.042 

Courtesy of MERCEDES-BENZ USA

1. Release and disconnect electrical connection at bypass air switchover valve (Y101).
2. Release and disconnect electrical connection at boost pressure control pressure transducer (Y77/1).
3. Unclip engine wiring harness from boost pressure control pressure transducer holder (Y77/1).
4. Release and disconnect electrical connection at intake camshaft solenoid (Y49/1).
5. Release and disconnect electrical connection at exhaust camshaft solenoid (Y49/2).
6. Release and disconnect electrical connection at intake camshaft Hall sensor (B6/15).
7. Release and disconnect electrical connection at exhaust camshaft Hall sensor (B6/16).
8. Engine 274.910 in model 213

   Release and disconnect electrical connection at intake camshaft valve lift switching actuator (Y49/8).

9. Release and disconnect electrical connection at oxygen sensor upstream of catalytic converter (G3/2x1) from bracket.
10. Remove cable shaft (18) from cylinder head cover, oil separator and high-pressure pump shielding .
11. Release and disconnect electrical connection at fuel pressure and temperature sensor (B4/25).
12. Release and disconnect electrical connection (19).
13. Release and disconnect electrical connection for cylinder 1 ignition coil (T1/1).
14. Release and disconnect electrical connection for cylinder 2 ignition coil (T1/2).
15. Release and disconnect electrical connection for cylinder 3 ignition coil (T1/3).
16. Release and disconnect electrical connection for cylinder 4 ignition coil (T1/4).
17. Release and disconnect electrical connection for cylinder 1 fuel injector (Y76/1).
18. Release and disconnect electrical connection for cylinder 2 fuel injector (Y76/2).
19. Release and disconnect electrical connection for cylinder 3 fuel injector (Y76/3).
20. Release and disconnect electrical connection for cylinder 4 fuel injector (Y76/4).
21. Unclip engine wiring harness from air filter housing and holders and place to one side.
22. Connect in reverse order.