3.1 Read Codes This function can identify which section of the emission control system has malfunctioned. 3.2 Erase Codes This function erases the codes from the vehicle, after retrieving codes from the vehicle and certain repairs have been carried out. Make sure the vehicle’s ignition key is in the ON position with the engine being off before the operation. 3.3 Data Stream This function retrieves and displays live data and parameters from the vehicle’s ECU. 3.4 View Freeze Frame This function takes a snapshot of the operating conditions when an emission-related fault occurs.
3.5 O2 Sensor Test This function retrieves O2 sensor monitor test results of the most recently completed tests from the vehicle’s on-board computer. 3.6 On-Board Monitor Test This function retrieves test results for emission-related powertrain components and systems that are not continuously monitored. The test’s availability is determined by the vehicle manufacturer. 3.7 EVAP System Test This function initiates a leak test for the vehicle’s EVAP system. Refer to the vehicle’s service repair manual to determine the procedures necessary to stop the test. 18