About the Code Reader
YELLOW LED - Indicates there is a possible problem. A
"Pending" DTC is present and/or some of the vehicle's emission
monitors have not run their diagnostic testing.
RED LED - Indicates there is a problem in one or more of the
vehicle's systems. The red LED is also used to show that DTC(s)
are present. DTCs are shown on the Code Reader's LCD display. In
this case, the Multifunction Indicator ("Check Engine") lamp on the
vehicle's instrument panel will light steady on.
7. LCD Display - Displays test results, Code Reader functions and
Monitor status information. See DISPLAY FUNCTIONS, below, for
8. CABLE - Connects the Code Reader to the vehicle's Data Link
See Figure 2 for the locations of items 1 through 13, below.
Vehicle icon - Indicates whether or not the Code Reader is
being properly powered through the vehicle's Data Link Connector
(DLC). A visible icon indicates that the Code Reader is being
powered through the vehicle's DLC connector.
Link icon - Indicates whether or not the Code Reader is
communicating (linked) with the vehicle's on-board computer. When
visible, the Code Reader is communicating with the computer. If the
Link icon is not visible, the Code Reader is not communicating with
Computer icon - When this icon is visible it indicates that the
Code Reader is linked to a personal computer. An optional "PC Link
Kit" is available that makes it possible to upload retrieved data to a
4. DTC Display Area - Displays the Diagnostic Trouble Code (DTC)
number. Each fault is assigned a code number that is specific to that
Figure 2. Display Functions