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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
automatically start a check of the
vehicle's computer to determine
which
protocol it is using. When the
CanOBD2&1 Scan Tool identifies
the
protocol, a communication link is es-
tablished. The protocol type used by
the vehicle's computer is shown on
the display.
A PROTOCOL is a set of rules and procedures for
regulating 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
communication 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
memory.
If the CanOBD2&1 Scan Tool fails
to link to the vehicle's computer a
"Linking Failed" message shows on
the
CanOBD2&1
display.
- Verify the connection at the DLC
and verify the ignition is ON.
- Turn the ignition OFF, wait 5 seconds, 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.
CanOBD2&1
type
of
communication
computer's
communication
Scan
OBD2 Systems
CODE RETRIEVAL PROCEDURE
Tool's
25
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