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Marty, Mercedes Technician
Category: Mercedes
Satisfied Customers: 53899
Experience:  Bosch Certified Master Tech. Over 35 years experience.
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WDBEA52E5RC047429 94 e320 no start. Main engine harness was

Customer Question

WDBEA52E5RC047429 94 e320 no start. Main engine harness was original and when replaced car ran perfect for 3 test drives. Now vehicle is a crank no start, with no spark and no injector pulse. Fuel pressure good at 40psi. Over voltage relay has been replaced along with crank sensor. Ecu connector has .6vac when cranking on pin for crank sensor. All grounds near battery including ground behind cluster have been cleaned. Ecu has been sent out and deemed in good working order. What are the exact pin numbers on ecu connectors that should have power and ground? One side note of information- Fuse 9 is blown. When replaced the car acts like the ignition switch is on even though key is out of the vehicle. (Fuse does not blow right away.)
Submitted: 1 year ago.
Category: Mercedes
Expert:  Marty replied 1 year ago.

Hi, my name is***** 27, 39 and 40 at the ecu should have 12V with the key on. Injectors and coils get power from fuse 6 with the key on. Terminal 22 and 23 are your grounds.

Let me know if you need further assistance.