Gem On-Demand Self-Test
- Connect NGS tester to DLC and perform proper hook-up procedure. See EQUIPMENT HOOK-UP .
- Turn ignition switch to ON position, unless otherwise instructed by specified test procedure. Rotate dial on scan tester to DIAGNOSTIC DATA LINK menu and press trigger.
- Rotate dial on scan tool to highlight desired module to be tested, and then press trigger. Ensure DIAGNOSTIC TEST MODES is highlighted, and then press trigger.
- Rotate dial on scan tool to highlight ON-DEMAND SELF-TEST, and then press trigger. Press button No. "3" to start test. Prepare vehicle for entry condition as specified for each module. Press trigger. Record any DTCs that are displayed.
NOTE:
On-demand self-test may be used to verify operation of a selected module.
NOTE:
If instructed to perform on-demand self-test from a specified test procedure, ensure ignition switch is in proper position as listed in test procedure. GEM requires ignition switch to be in ON position or test will fail.
NOTE:
To carry out GEM self-test on Excursion, headlights must off. On "F" series, headlights must be on.