Innova 31603, Owner'S Manual, Page: 36 / 104

Using the Scan Tool
CODE RETRIEVAL PROCEDURE
34 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.
6. The Scan Tool will automatically start a
check of the vehicle’s computer to
determine which type of communication
protocol it is using. When the Scan 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
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
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
vehicle’s computer a “Linking Failed”
message shows on the Scan Tool’s
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.