Vehicle Preparation

Carry out all safety steps required to start and run vehicle tests. Apply the parking brake, place the gear selector lever firmly into the PARK position on automatic transmission vehicles or NEUTRAL on manual transmission vehicles, and block the drive wheels.
Turn off all electrical loads such as radios, lamps, A/C, blower, and fans.
Start the engine (if the engine runs) and bring it up to the normal operating temperature before running the quick test.