How to Switch Diagnostic Test Modes

HOW TO SWITCH DIAGNOSTIC TEST MODES
^ Switching the modes is not possible when the engine is running.
^ When ignition switch is turned off during diagnosis, power to Engine Control Module (ECM) will drop after approx. 1 second. The diagnosis will automatically return to Diagnostic Test Mode I.
^ Turn back diagnostic test mode selector to the fully counterclockwise position whenever vehicle is in use.