Hy,

I have a 2000's CRB, and I have a problem with the speed sensor. I got out the sensor, and maked some measurements. I attachmented the testing circuit.
When I put a metal in front of the sensor, the output voltage goes to 0V or stays at 5V. It was not stable.
When I put a metal in front of the sensor, the sensor should go to 0V. This is the ideal condition. But in my case it is not always the case.
Or the standby is not 0V, sometime 5V. I think the sensor is bad.
Has anyone done a measurement of the sensor when it was out of place?

Thank you!

 

Based on your description, it appears that the output voltage of the speed sensor is not stable when you place a metal object in front of it. In ideal conditions, the sensor should output 0V when obstructed. However, in your case, the output voltage fluctuates between 0V and 5V, and sometimes stays at 5V even with an obstruction.

There could be several potential causes for this issue:

1. Faulty sensor: It's possible that the speed sensor itself is defective. Over time, sensors can wear out or become damaged, leading to inconsistent or incorrect readings. Replacing the sensor may be necessary.
   
2. Wiring or connection problem: Check the wiring and connections associated with the speed sensor. Loose connections or damaged wiring can cause intermittent voltage readings. Ensure all connections are secure and there are no signs of damage or corrosion.
   
3. Power supply issue: The speed sensor might be receiving unstable voltage or insufficient power. Inspect the power supply to the sensor and ensure it is within the specified range. Faulty wiring or a malfunctioning power source could be the culprit.
   
4. Sensor alignment: It's important to ensure that the sensor is properly aligned with the target or gear it's meant to detect. Incorrect positioning can lead to inaccurate readings or unstable output.
   

Regarding your question about measurement, it would be helpful to refer to the car's service manual or technical documentation for specific guidance on sensor measurements when it's removed from the vehicle. The manufacturer's instructions should provide details on expected voltage ranges and how to perform accurate measurements. Also in some situations, you can try to use odometer blocker .

 

@Mimi Moore We don't need any ChatGPT responses here. The person is looking for real world answers. BTW, they're not working on a CAR!