Tahoe 2WD V8-4.8L VIN V (2004)
Alignment: Service and Repair
Measuring Wheel Alignment
With Rear Wheel Steering
Measuring Wheel Alignment (With Rear Wheel Steering)
Learn Wheel Alignment
After replacement of the hand-wheel position sensor, rear wheel position sensor or rear wheel steering control module it is necessary to perform the
learn wheel alignment procedure.
Alignment Procedure
Steering and vibration complaints are not always the result of improper alignment. One possible cause is wheel and tire imbalance. Another possibility
is tire lead due to worn or improperly manufactured tires. Lead is the vehicle deviation from a straight path on a level road without pressure on the
steering wheel. Refer to Radial Tire Lead/Pull Correction in order to determine if the vehicle has a tire lead problem.
Before performing any adjustment affecting wheel alignment, perform the following inspections and adjustments in order to ensure correct alignment
readings:
^
Inspect the tires for the proper inflation and irregular tire wear.
^
Inspect the runout of the wheels and the tires.
^
Inspect the wheel bearings for backlash and excessive play.
^
Inspect the ball joints and tie rod ends for looseness or wear.
^
Inspect the control arms and stabilizer shaft for looseness or wear.
^
Inspect the steering gear for looseness at the frame.
^
Inspect the struts/shock absorbers for wear, leaks, and any noticeable noises.
^
Inspect the vehicle trim height.
^
Inspect the steering wheel for excessive drag or poor return due to stiff or rusted linkage or suspension components.
^
Inspect the fuel level. The fuel tank should be full or the vehicle should have a compensating load added.
Give consideration to excess loads, such as tool boxes, sample cases, etc. If normally carried in the vehicle, these items should remain in the vehicle
during alignment adjustments. Give consideration also to the condition of the equipment being used for the alignment. Follow the equipment
manufacturer's instructions.
Satisfactory vehicle operation may occur over a wide range of alignment settings. However, if the setting exceeds the service allowable specifications,
correct the alignment to the service preferred specifications.
Perform the following steps in order to measure the front and rear alignment angles:
1. Install the alignment equipment according to the manufacturer's instructions.
2. Jounce the front and the rear bumpers 3 times prior to checking the wheel alignment.
3. Measure the alignment angles and record the readings.
Important: When performing adjustments to vehicles requiring a 4-wheel alignment, set the rear wheel alignment angles first in order to obtain
proper front alignment angles.
4. Adjust alignment angles to vehicle specification, if necessary.
Learn Wheel Alignment Procedure
1. Turn ignition to ON position, with the engine ON.
2. Install the scan tool.
3. Center the steering wheel.
4. Lift the rear of the vehicle off the ground ensuring the rear wheels are centered.
5. Go to the Learn Alignment menu choice in the scan tool. Follow the prompts on the scan tool.
Important: When prompted by the scan tool you must turn the steering wheel a full 90° to the left and a full 90° to the right and then to center
and hold. If this step is not done properly then it is possible to cause a false DTC for the steering wheel position sensor
6. Press the continue button.
7. Use the scan tool to clear all rear wheel steering DTC's.
Without Rear Wheel Steering
Measuring Wheel Alignment (Without Rear Wheel Steering)
Steering and vibration complaints are not always the result of improper alignment. One possible cause is wheel and tire imbalance. Another possibility
is tire lead due to worn or improperly manufactured tires. Lead is the vehicle deviation from a straight path on a level road without pressure on the
steering wheel. Refer to Radial Tire Lead/Pull Correction in order to determine if the vehicle has a tire lead problem. Before performing any
adjustment affecting wheel alignment, perform the following inspections and adjustments in order to ensure correct alignment readings:
