Equus 3120 - OBD 2&1 Tool Kit - Manual (Page 26)

24 OBD2 & 1
E
OBD2 Systems
CODE RETRIEVAL PROCEDURE
■ If the unit does not power on automatically when connected to
the vehicle’s DLC connector, it usually indicates there is no
power present at the vehicle’s DLC connector. Check your fuse
panel and replace any burned-out fuses.
■ If replacing the fuse(s) does not correct the problem, consult your
vehicle’s repair manual to identify the proper computer (PCM) fuse/
circuit, and perform any necessary repairs before proceeding.
5. Turn the ignition on. DO NOT start the engine.
6. Press and release the Tool’s POWER/LINK button.
■ The Tool will automatically start a
check of the vehicle’s computer to
determine which type of communica-
tion protocol it is using. When the Tool
identifies the computer’s communica-
tion protocol, a communication link is
established. The protocol type used
by the vehicle’s computer is shown on
the LCD display.
A PROTOCOL is a set of rules and procedures for regu-
lating data transmission between computers, and between
testing equipment and computers. As of this writing, five
different types of protocols (ISO 9141, Keyword 2000,
J1850 PWM, J1850 VPW and CAN) are in use by vehicle
manufacturers. The Tool automatically identifies the proto-
col type and establishes a communication link with the
vehicle’s computer.
7. After approximately 10~60 seconds, the Tool will retrieve and dis-
play any Diagnostic Trouble Codes, Monitor Status and Freeze
Frame Data retrieved from the vehicle’s computer memory.
■ If the Tool fails to link to the vehicle’s
computer a “Linking Failed” message
shows on the Tool’s LCD display.
- Verify the connection at the DLC
and verify the ignition is ON.
- Turn the ignition OFF, wait 5 sec-
onds, then turn back ON to reset
the computer.
- Ensure your vehicle is OBD2 compliant. See Vehicles
Covered on page 20 for vehicle compliance verification infor-
mation.