EVA Vibration Sensor

WARNING: This page is about a different car, the 2007 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.

The J 38792-A vibration sensor incorporates a 6. 1 m (20 ft) cord, that allows the sensor to be placed on virtually any component of the vehicle where a vibration concern is felt. See Special Tools .

The J 38792-A contains 2 sensor input ports which can be activated individually to allow for 2 individual vibration sensor inputs. See Special Tools . The vibration sensors can then be placed in 2 different locations in the vehicle and their individual inputs can be read without having to stop a test, move the sensor and resume the test. The use of 2 vibration sensors can help in more quickly finding and recording an accurate frequency of the vibration concern, and in more quickly making comparisons between 2 different areas of a single component, or a vehicle system, during the diagnostic process.

EVA Vibration Sensor Placement

Proper placement of the J 38792-A vibration sensor (accelerometer) is critical to ensure that proper vibration readings are obtained by the J 38792-A . See Special Tools . The vibration sensor should be placed on the specific vehicle component identified as being the most respondent to the vibration. If no component has been identified, install the sensor to the steering column as a starting point.

EVA Vibration Sensor-to-Component Attachment

IMPORTANT: The J 38792-A vibration sensor must be attached to vehicle components in the manner indicated in order to achieve accurate frequency readings of the vibration disturbance. See Special Tools .

The vibration sensor of the J 38792-A is designed to pickup disturbances which primarily occur in the vertical plane, since most vibrations are felt in that same up-and-down direction. See Special Tools . The J 38792-A vibration sensor is therefore directional sensitive and must be attached to vehicle components such that the side of the sensor marked UP is always facing upright and the sensor body is as close to horizontal as possible. See Special Tools . The sensor must be installed in the exact same position each time tests are repeated or comparisons are made to other vehicles.

The J 38792-A vibration sensor can be attached to vehicle components in various ways. See Special Tools . For non-ferrous surfaces, such as the shroud of a steering column, the sensor can be attached using putty, or hook and loop fasteners. For ferrous surfaces, the sensor can be attached using a magnet supplied with the sensor.