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NT301PLUS OBDII & Battery Tester User’s Guide_ English Version_V1.00
24
Figure 4-30 Sample Diagnostic Menu Screen
2. Colored LED and build-in beeper provide both visual and audible reminders for emission
check and DTCs. Below is the interpretation of the LED and build-in beeper.
When the LED is :
● Green - Indicates that engine systems are “OK” and working properly (the number of
Monitors equipped with the vehicle which have run and performed their self-diagnostic
testing is in the allowed range. MIL is off. ).No stored and pending DTCs exist. The
vehicle is ready for an Emissions Test.
● Yellow - The tool finds a possible problem. It indicates the following two conditions:
(1) Pending DTCs exist. Please check the I/M Readiness test result screen and use the
Read Codes function to view detailed codes information.
(2) Some of the vehicle’s emission monitors have not working properly. If the I/M
Readiness screen shows no DTC (including pending DTC), but the Yellow LED is
still illuminated, it indicate a “Monitor Has Not Run” status.
●Red- Indicates some problems exist with one or more of the vehicle’s system, and the
vehicle is not ready for an Emissions Test. As well there are DTCs found. The MIL lamp
on the vehicle’s instrument panel will light steady. The problem that is causing the
illumination of Red LED should be fixed before an Emissions Test or driving the vehicle
further.
The built-in beeper works with the colored LED simultaneous, as an assistance to reflect the I/M
Readiness test results:
●Green - two long beeps.
●Yellow - short, long, short beeps.
●
Red - four short beeps.
NOTE
The built-in beeper which makes different tones corresponding to different LED indicators is
invaluable when the test is performed while driving or in bright areas where LED illumination
may not be visible.
To retrieve I/M Readiness Status data by typical way:
1. Scroll with UP/DOWN key to highlight I/M Readiness from Diagnostic Menu and press the
ENTER key. If vehicle supports both types of monitors, a screen for monitor type selection
displays. Select a monitor type and press the ENTER key.
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