Equus 3140 - Scan Tool CanOBD2&1 Kit - Manual (Page 27)

CanOBD2&1 25
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 CanOBD2&1 Scan Tool’s POWER/LINK
button.
■ The CanOBD2&1 Scan Tool will auto-
matically start a check of the vehicle’s
computer to determine which type of
communication protocol it is using.
When the CanOBD2&1 Scan 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 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 CanOBD2&1 Scan Tool automatically
identifies the protocol type and establishes a communica-
tion link with the vehicle’s computer.
7. After approximately 10~60 seconds, the CanOBD2&1 Scan Tool will
retrieve and display any Diagnostic Trouble Codes, Monitor Status
and Freeze Frame Data retrieved from the vehicle’s computer mem-
ory.
■ If the CanOBD2&1 Scan Tool fails to
link to the vehicle’s computer a
“Linking Failed” message shows on
the CanOBD2&1 Scan Tool’s 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 21 for vehicle compliance verification information.