Manual
Using the Diagnostic Tool
CODE RETRIEVAL PROCEDURE
38 OBD2
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.
The Diagnostic Tool will automatically start a check of the vehicle’s
computer to determine which type of communication protocol it is
using. When the Diagnostic Tool identifies the computer’s
communication 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
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 Diagnostic Tool
automatically identifies the protocol type and establishes a
communication link with the vehicle’s computer.
6. After approximately 10~60 seconds, the Diagnostic Tool will
retrieve and display any Diagnostic Trouble Codes, Monitor Status
and Freeze Frame Data retrieved from the vehicle’s computer
memory.
If the Diagnostic Tool fails to link to
the vehicle’s computer a “Linking
Failed” message shows on the
Diagnostic Tool’s LCD 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
5 for vehicle compliance verification
information.
The Diagnostic Tool will automati-
cally re-link to the vehicle’s com-
puter every 30 seconds to refresh
the data being retrieved. When data
is being refreshed, the message
“One moment Auto – link in
progress” is shown on the LCD
display. This action repeats as long
as the Diagnostic Tool is communicating with the vehicle’s
computer.