Test Description

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2003 GMC Yukon XL, 2003 GMC Yukon, 2003 Chevrolet Tahoe, 2003 Chevrolet Suburban, and 2003 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

2 If powertrain related DTCs are present, there may be a powertrain performance condition present which could be a contributing cause to the customer's concern.
3 This step is designed to identify engine-speed related disturbances that are NOT torque or load sensitive.
4 This step is designed to identify engine-speed related disturbances that ARE torque or load sensitive.
6 Making comparisons of the customer's vehicle with an equally equipped, same model year and type, KNOWN GOOD vehicle will help determine if certain disturbances may be characteristic of a vehicle design.

Fig 1: Vibration Analysis - Engine (Step 1-5)
Courtesy of GENERAL MOTORS CORP.

Fig 2: Vibration Analysis - Engine (Step 6)

Courtesy of GENERAL MOTORS CORP.