Trim Height Inspection
Trim Height Measurement
Trim height is a predetermined measurement relating to vehicle
ride height. Incorrect trim heights can cause the vehicle to bottom
out over bumps, damage to the suspension components and symptoms
similar to wheel alignment problems. Check the trim heights when
diagnosing suspension concerns and before checking the wheel
alignment.
Perform the following before measuring the trim heights:
• |
Check the fuel level. Add
additional weight if necessary to simulate a full tank.
|
• |
Make sure the passenger and
rear compartments are empty, except tor the spare tire.
|
• |
Make sure the vehicle is on a
flat and level surface, such as an alignment rack. |
• |
Check that all the vehicle
doors are securely closed. |
• |
Check that the vehicle hood
and rear deck lids are securely closed. |
• |
Check for installed after
market accessories or modifications that could affect trim height
measurement. |
Measuring the P and R Dimension
Note: All dimensions are
measured vertical to the ground. Trim height should be within
±10 mm (±0.39 in) to be considered correct.
Use the following procedure to check the P and R dimensions:
• |
Lift the front bumper of the
vehicle up about 38 mm (1.5 in). |
• |
Gently remove your hands and
let the vehicle settle. |
• |
Repeat this operation 2 more
times for a total of 3. |
• |
P height is measured
vertically from the ground to the bottom lip of the wheel opening
through the centerline of the front wheel. |
• |
Push the front bumper of the
vehicle down about 38 mm (1.5 in). |
• |
Gently remove your hands and
let the vehicle settle down. |
• |
Repeat this operation 2 more
times for a total of 3. |
• |
Measure the P height as in
step 4. |
• |
The true P height measurement
is the average of the measurements taken in step 4 and 8.
|
• |
Repeat the above steps on the
rear of the vehicle for the R heights. |
|