Retrieving Diagnostic Trouble Codes
- Hook-up New Generation Star (NGS) scan tester. See EQUIPMENT HOOK-UP . Turn ignition switch to RUN position. Ensure COMMUNICATION NETWORK DIAGNOSTICS and ON-DEMAND SELF-TEST have been performed.
- Rotate dial on scan tester to DIAGNOSTIC DATA LINK menu, and press trigger to select. Advance to next screen and select the module you wish to access. To determine which module to access, see DIAGNOSTIC TROUBLE CODE (DTC) DEFINITIONS .
- Advance to next screen and select DIAGNOSTIC TEST MODES. Advance to next screen and select RETRIEVE/CLEAR CONTINUOUS DTC. Advance to next screen and press start (3 button).
- At this screen, any DTCs will be displayed. Record DTCs. To clear individual codes, rotate knob to highlight DTC then press 8 button. To clear all codes from selected module, press 7 button.
- To determine if fault(s) are continuous (hard faults) or intermittent, clear codes. Recheck for DTCs. If codes reappear shortly after clearing all codes, code is considered continuous (hard fault). If fault is intermittent, attempt to re-create condition that caused code to set (operate switches, wiggle wiring, etc.).
- Once all DTCs have been retrieved, go to DIAGNOSTIC TROUBLE CODE (DTC) DEFINITIONS . Using the description from the table, determine appropriate article to continue code-related testing. If sent to this article from another article, return to original article.