With Scan Tool

Generator and A/C Compressor Drive Belt Vibration Frequency
When Checked 134 - 159 Hz
When A Used Belt Is Installed 141 - 153 Hz
When A New Belt Is Installed 170 - 190 Hz

Power Steering Oil Pump Vibration Frequency
When Checked 125 - 154 Hz
When A Used Belt Is Installed 133 - 148 Hz
When A New Belt Is Installed 160 - 183 Hz