Vibration Analysis - Road Testing; Test Description - Suzuki XL7 2007 Service Manual

0A-61 General Information:

Vibration Analysis - Road Testing

Test Description

The numbers below refer to the step numbers on the diagnostic table.
5.
Obtaining rotational speed for the components rotating at tire/wheel speed is critical to systematically eliminating
specific vehicle component groups. These component rotational speeds can be generated by using the J 38792-VS
Vibrate Software, or through calculating them manually.
14.
NOTE
Be certain to OBSERVE for disturbances that match the customer's description FIRST, then look at the
J 38792-A frequency which corresponds with that disturbance.
Proper location of the J 38792-A Electronic Vibration Analyzer (EVA) 2, sensor onto the component which is most
excited by the vibration disturbance is critical to obtaining an accurate frequency reading.
This test will duplicate virtually any disturbance which occurs while the vehicle is in motion.
17.
Accelerate to a speed high enough above the speed of the disturbance to allow for the time needed to shift into
NEUTRAL and for the engine to decrease in RPM to idle speed, before coasting down through the disturbance range.
18.
This test will either eliminate or confirm the engine as a contributing cause of the customer concern.
Step
WARNING
!
Refer to "Road Test Caution: ".
Did you review the Diagnostic Starting Point - Vibration
Diagnosis?
1
Did the customer concern indicate that the vibration occurs
2
ONLY while the vehicle is standing still?
Visually inspect the tire and wheel assemblies, steering
components and suspension components for any possible
3 faults.
Are the tire and wheel assemblies, steering components and
suspension components in good working condition?
NOTE
Do NOT operate the vehicle until the faults are
corrected.
Correct the faults with the tire and wheel assemblies, steering
4
components, and/or the suspension components before
proceeding.
Did you correct the faults with the tire and wheel assemblies,
steering components, and/or the suspension components?
1. Obtain the drive axle final drive ratio.
2. If the J 38792-VS, Vibrate Software, IS available, obtain
the transmission gear ratios.
3. If the J 38792-VS is NOT available, take note of the tire
size on each axle, then calculate the tire rotational speed
5
for each size tire used and calculate the propeller shaft
rotational speed, if equipped. Refer to "Component
Rotational Speed Calculation: ".
Did you obtain the powertrain ratios for use with the J 38792-
VS, or calculate the component rotational speeds, if J 38792-
VS is NOT available?
Action Yes
Go to "Diagnostic
Starting Point -
Go to Step 2
Vibration Diagnosis
and Correction"
Go to Step 6 Go to Step 3
Go to Step 5 Go to Step 4
Go to Step 5 Go to Step 3
Go to Step 6
No
—