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NT204 OBDII/EOBD Code Reader User’s Guide_English Version_V1.00
11
Figure 4-1 Sample System Status Screen
NOTE
If vehicle is equipped with more than one computer module (for example a powertrain control
module [PCM] and a transmission control module [TCM]), the code reader identifies them by their
identification names (ID) assigned by manufacturer (i.e. Engine or Module $A4).
A screen with prompted information to erase the previously stored data in order to save the data
from this test displays as below.
Figure 4-2 Sample Erase the Previous Stored Data Screen
If previous data is to be erased, select Yes; if data is not to be erased, Use the UP/DOWN key to
pick No. Wait a few seconds to return to Diagnostic Menu.
NOTE
If no data is stored in the code reader, the above screen will not show up.
4.1 Read Codes
Read Codes menu lets you read stored codes and pending codes found in the control unit.
Typical menu options include:
●
Stored Codes
●
Pending Codes
Diagnostic trouble codes stored in a control module are used to help identify the cause of a
trouble or troubles with a vehicle. These codes have occurred a specific number of times and
indicate a problem that requires repair.
Pending codes are referred to as maturing codes that indicate intermittent faults. If the fault does
not occur within a certain number of drive cycles (depending on vehicle), the code clears from
memory. If a fault occurs a specific number of times, the code matures into a DTC and the MIL
illuminates or blinks.
There are two ways to read codes using NT204.
● Press the Read hot key to read codes from home screen.
● Traditional way: select Read Codes from the diagnostic menu.
To read codes from a vehicle:
1. Press the Read hot key to directly read the codes from home screen. Or scroll with the
UP/DOWN key to highlight Read Codes from Diagnostic Menu and press the ENTER key.
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