Special Tools (Diagnostic)
WARNING: This page does not describe the selected car, but rather 24 other vehicles, including the 1992 GMC Yukon, 1992 GMC Vandura Special, 1992 GMC Vandura, 1992 GMC Value Van, and 1992 GMC Suburban. However, it is still accessible from the selected car via links, so may be relevant.
Special scan testers are plugged into the ALDL may be used to read trouble codes, and check voltages in system on serial data line. These testers can save a great deal of time. For additional information, see manual included with tester.