DTC 5151? I removed the ride height level sensor?

BLESSING EWOBOR

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2010 MERCEDES BENZ R350
V6
2WD
AUTOMATIC
342,466 MILES

Hello, I am working on a vehicle, the vehicle air spring is not functioning. When the vehicle was scanned, a DTC 5151(refer to service manual) was displayed. I removed the height level sensor, it has three with on the connector, when I probe the wires, the voltage was 1.074V. I think the reference voltage should be 5V, if I am right.
What could have been the cause?
Could I have a circuit diagram for it?

Thank you very much for your support so far.

7 Replies

KEN L

MASTER CERTIFIED MECHANIC
47,981 POSTS

You are correct, there should be a 5-volt reference signal supply line. There are 3 fuses that run the system here is the wiring diagrams so you can see how the system works and which fuses to check.

Diagnostic Trouble Code (DTC) 5151 indicates an issue with the Rear Axle Level Sensor (B22/3), specifically a "signal implausible" error.

Here is the location of the right rear level sensor so we can be on the same page. Check out the images (below). Please let us know what happens.

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Thursday, November 28th, 2024 AT 12:45 PM

BLESSING EWOBOR

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Thank you very much.

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Thursday, November 28th, 2024 AT 8:47 PM

KEN L

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Use 2CarPros anytime, we are here to help. Please tell a friend.

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Friday, November 29th, 2024 AT 10:41 AM

BLESSING EWOBOR

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Hello, I have checked the fuses and they are in good condition. I probe the module terminals while the engine is running, the powers and ground are available at the module but provide the reference voltage terminal, it is not up to 5v but 1.047 volt. Is it that the ECU is bad?

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Saturday, November 30th, 2024 AT 12:28 PM

KEN L

MASTER CERTIFIED MECHANIC
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I would disconnect all ride height sensors and check it again, if one of them is shorted it will bring down the reference voltage. Also, I would check the grounds of the level control module.