Equus 3120 - OBD 2&1 Tool Kit - Manual (Page 73)

OBD2 & 1 71
E
Toyota/Lexus OBD1 Systems
ON-BOARD VEHICLE DIAGNOSTICS / VEHICLES COVERED
ON-BOARD VEHICLE DIAGNOSTICS (OBD 1)
• Beginning in 1988, California's Air Resources Board (CARB), and
later, the Federal Government's Environmental Protection Agency
(EPA), required vehicle manufacturers to include a self diagnos-
tic program capable of identifying an emissions-related fault via
the vehicles On-Board Computers (some manufacturers used
OBD before it was required). The first generation of Onboard
Diagnostics came to be known as OBD I.
• OBD I is a set of self-testing or self-diagnosing instructions that
are programmed into the vehicle's on-board computer.
• The program is specifically designed to detect failures in the sen-
sors, actuators, switches and wiring of the various vehicle emis-
sions-related systems (fuel injection system, ignition system,
EGR system, catalytic converter, etc.). If the computer detects a
failure in any one of these components or systems, it alerts the
driver by illuminating the "Check Engine" light on the dash.
• The computer also assigns a numeric code (OBD I systems uti-
lized a 2 or 3 digit code) for each specific problem that it detects,
and stores these codes in it's memory for later retrieval. The
codes can be retrieved from the computer's memory with the use
of a device called a "Tool" or a "Scan Tool".
With the exception of some 1994 and 1995 vehicles, most
vehicles from about 1982 to 1995 are equipped with OBD I
systems.
VEHICLES COVERED
The following tables identify the Toyota and Lexus OBD 1 vehicles that
are covered by the OBD 2 & 1 Tool.
DLC 1 Cars
Eng. Eng. DOHC/ DLC
Year Model Size Code SOHC Other Type
1995 Camry Coupe 2.2L 5S-FE DOHC 1
1992 Camry Sedan 2.2L 5S-FE DOHC 1
1992 Camry Sedan 3.0L 2VZ-FE DOHC 1
1993 Camry Sedan 3.0L 3VZ-FE DOHC 1
1993 Camry Sedan 2.2L 5S-FE DOHC 1
1994 Camry Sedan 2.2L 5S-FE DOHC 1
1993 Celica 2.0L 3S-GTE DOHC Turbo 1
1993 Celica 2.2L 5S-FE DOHC 1
1994 Celica 1.8L 7A-FE DOHC 1
1994 Celica 2.2L 5S-FE DOHC 1