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NT530 Plus User’s Manual_English_V1.03
● Active test
● Advance ID
● Readiness test
NOTE
Not all function options listed above are applicable to all vehicles. Available options may vary by the year,
model, and make of the test vehicle. A “The selected mode is not supported!” message displays if the option is
not applicable to the vehicle under test.
4.1.3.1 Read Codes
Read Codes menu lets you read trouble codes found in the control unit.
Present/Permanent/Current 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 also 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.
History codes are also referred to as past codes that indicate intermittent DTCs that are not currently active.
Code history is number of engine starts since the DTC(s) were first detected (to see if they are current or
intermittent).
Self-diagnostic lets you manually activate system tests that check for DTCs. Usually it includes a KOEO (Key-on,
engine-off) test and a KOER (key-on, engine-running) test.
To read codes from a vehicle:
1. Scroll with the arrow keys to highlight Read Codes from Function Menu and press the ENTER key. A code list
including code number and its description displays.
Figure 4-9 Sample Function Menu Screen
2. Use the up and down arrow keys to scroll through data to select lines, and left and right arrow keys to scroll
back and forth through different screens of data.
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