Using the Diagnostic Tool
CODE RETRIEVAL PROCEDURE
34 3150e
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 Diagnostic Tool will automatically
start a check of the vehicle’s computer
to determine which type of communica-
tion protocol it is using. When the
Diagnostic Tool identifies the compu-
ter’s communication protocol, a com-
munication link is established.
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.
If the Diagnostic Tool fails to link to
the vehicle’s computer, a “Communi-
cation Error” message shows on the
Diagnostic Tool’s display.
- Ensure your vehicle is OBD2 com-
pliant. See VEHICLES COVERED
on page 5 for vehicle compliance
verification information.
- Verify the connection at the DLC, and verify the ignition is ON.
- Turn the ignition OFF, wait 5 seconds, then back ON to reset
the computer.
- Press the ENTER
button to continue.
If the Diagnostic Tool cannot link to
the vehicle’s computer after three
attempts, the message “Contact
Technical Support” displays.
- Press the SYSTEM MENU
button to return to the System Menu.
- Turn the ignition off, and dis-
connect the Diagnostic Tool.
- Contact Technical Support for
assistance.
The Diagnostic Tool will display a
code only if codes are present in the
vehicle’s computer memory. If no
codes are present, the message “No
Powertrain DTCs or Freeze Frame
Data presently stored in the
vehicle’s computer.”
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