Diagnostic Aids

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2011 GMC Yukon XL, 2011 GMC Yukon, 2011 Chevrolet Tahoe, 2011 Chevrolet Suburban, and 2011 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

Downloading the AFIT test results to the shop TIS terminal will clearly show which injector is at fault by the bar graph turning red.
On some vehicles cleaning the injectors may be performed if the graph shows erratic or values close to the specified values.
A second test can be performed to verify repair. Compare the first balance test to the second.