Test Description

WARNING: This page is about a different car, the 2002 Pontiac Grand Prix. 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 (1 Of 3)

Courtesy of GENERAL MOTORS CORP.

Fig 2: Vibration Analysis - Engine (2 Of 3)

Courtesy of GENERAL MOTORS CORP.

Fig 3: Vibration Analysis - Engine (3 Of 3)

Courtesy of GENERAL MOTORS CORP.