Scan Tester
A variety of information is transmitted through ALDL connector terminal "E" or "M" depending on engine. This data is transmitted at a high frequency which requires a Tech 1 Scan tester for interpretation. Several Scan testers are available for diagnostic work. Scan testers other than Tech 1 Scan tester will function and provide information for diagnostic work; however, some charts will specify a Tech 1 Scan tester. Failure to use a Tech 1 Scan tester when specified may result in incorrect diagnosis of a system.
NOTE:
If a chart other than a C-10 or C-12 chart is referenced, see appropriate article in the ENGINE PERFORMANCE Section.