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Scanner Operations Operations
Figure 5-21 Sample DTC status report
5. Tap Exit to return to the DTC status entry screen.
6. Tap Exit again to return to the Codes menu.
5.5.3 Functional Tests
The Functional Tests selection is used to access vehicle-specific subsystem and component
tests. Available tests vary by manufacturer, year, and model, and only the available tests display
in the menu.
There are four general types of functional test operations:
• Information Tests—are read-only tests, like selecting “VIN” from a Functional Tests menu to
display the VIN of the identified vehicle.
• Toggle Tests—switch a component, such as a solenoid, relay, or switch, between two
operating states.
• Variable Control Tests—command a certain value for a system or component, such as
varying the spark timing in 1° increments or the EGR valve duty cycle in 10% increments.
• Reset Tests—reset the adaptive, or learned, values that are stored in the control module.
Selecting Functional Tests opens a menu of test options that varies by make and model. Selecting
a menu option either activates the test or opens a submenu of additional choices. Follow all
screen instructions while performing tests. How and what information is presented on the screen
varies according to the type of test being performed.
Some toggle and variable control tests display functional test controls at the top of the screen with
data stream information below (
Figure 5-22).
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