Download Manual (pdf) - Equus

GM OBD1 Systems
ABOUT THE TOOL - DLC - MIL - DTCs
ABOUT THE TOOL
In addition to the list on the previous page, this Tool IS
ALSO COMPATIBLE with OBD1 GM models that are
equipped with "Climate Control Computers".
For 1994 and 1995 vehicles, only the models listed above are
compatible with the Tool.
The Tool is a device that connects to your vehicle's Data Link Connector
to retrieve any Diagnostic Trouble Codes that are stored in the vehicle's
on-board computer.
DATA LINK CONNECTOR (DLC)
Your vehicle test connector is known as the
Assembly Line Data Link (ALDL) connector,
Assembly Line Communication Link (ALCL)
Connector or the Data Link Connector
(DLC). The GM DLC connector contains 12 pins and is usually black in
color. On most GM vehicles, the connector is found under the left side of
the dashboard.
MALFUNCTION INDICATOR LIGHT (MIL)
Your vehicle's instrument panel has a Malfunction Indicator Light (MIL)
also called the "Check Engine" or "Service Engine soon" light. The MIL
is an indicator to warn the vehicle operator of a problem in the computer
control system.
CHECK ENGINE
SERVICE
ENGINE
SOON
If your instrument panel indicator lights do not come on when
you turn on the ignition, please refer to your vehicle's service
manual. You may have problems in the vehicle's circuitry.
DIAGNOSTIC TROUBLE CODES (DTC's)
The service codes are also called "fault codes", "Diagnostic Trouble
Codes" (DTC's) or "trouble codes". These codes can be used to identify
systems or components that are malfunctioning. The computer records
codes for two types of problems:
� "Hard" Diagnostic Trouble Codes
"Hard" DTCs represent problems that are occurring now and cause
the instrument panel Malfunction Indicator Lamp (MIL) or Check
Engine light to illuminate and remain on until the failure is repaired.
A DTC is stored in the vehicle's computer memory for each fault
detected. A Tool or Scanner can be used to retrieve DTCs that are
stored in the vehicle's computer memory.
84 OBD2&1