Equus 3150 - ABS/SRS + OBD2 Diagnostic Tool - Manual (Page 37)

Using the Code Reader
CODE RETRIEVAL PROCEDURE
OBD2 35
„ 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 Code Reader’s POWER/LINK
button.
„ The Code Reader will automatically
start a check of the vehicle’s
computer to determine which type of
communication protocol it is using.
When the Code Reader 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 Code Reader
automatically identifies the protocol type and establishes a
communication link with the vehicle’s computer.
7.
After approximately 4~5 seconds, the Code Reader will retrieve and
display any Diagnostic Trouble Codes, Monitor Status and Freeze
Frame Data retrieved from the vehicle’s computer memory.
„ If the Code Reader fails to link to the
vehicle’s computer a “Linking Failed”
message shows on the Code
Reader’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.