LAUNCH
3001
User’s Manual
24
5. Diagnose
After the tool is properly connected to the vehicle’s DLC, select [Diagnose] in Main
Menu and press [OK]. The tool will automatically start a check of the vehicle’s
computer to determine which type of communication protocol it is using. When the
tool identifies the computer’s communication protocol, a communication link is
established and then the screen will display the Monitor Status.
*Note: A PROTOCOL is a set of rules and procedures for regulating data transmission
between computers, and between testing equipment and computers. Now five different
types of protocols (ISO 9141, Keyword 2000, J1850 PWM, J1850 VPW and CAN) are in
use by vehicle manufacturers.
On the Monitor Status screen, press [OK], a screen similar to the following figure
will appear:
It mainly includes the following functions:
1. Read Codes
This option is used to identify which section of the emission control system has
malfunctioned.
*
Note: Never replace a part based only on the DTC definition. Each DTC has a set of
testing procedures, instructions and flow charts that must be followed to confirm the
location of the problem. This information is found in the vehicle’s service manual.
Always refer to the vehicle’s service manual for detailed testing instructions.
2. Erase Codes
After reading the retrieved codes from the vehicle and certain repairs have been
carried out, you can use this function to erase the codes from the vehicle. Before
performing this function, please be sure the vehicle’s ignition key is in the ON
position with the engine off.
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