Equus 3130 - Scan Tool – OBD2 - Manual (Page 25)

OBD2 23
E
Using the Scan Tool
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 Scan Tool’s POWER/LINK button.
■ The Scan Tool will automatically start
a check of the vehicle’s computer to
determine which type of communica-
tion protocol it is using. When the
Scan Tool identifies the computer’s
communication protocol, a communi-
cation link is established. The proto-
col type used by the vehicle’s com-
puter is shown on the 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 Scan Tool automatically identifies the
protocol type and establishes a communication link with
the vehicle’s computer.
7. After approximately 10~60 seconds, the Scan Tool will retrieve and
display any Diagnostic Trouble Codes, Monitor Status and Freeze
Frame Data retrieved from the vehicle’s computer memory.
■ If the Scan Tool fails to link to the vehi-
cle’s computer a “Linking Failed” mes-
sage shows on the Scan Tool’s dis-
play.
- 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 5 for vehicle compliance verification infor-
mation.