NT204 OBDII/EOBD Code Reader User’s Guide_English Version_V1.00
(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
The built-in beeper works with the colored LED simultaneous, as an assistance to reflect the I/M
● Green - two long beeps.
● Yellow - short, long, short beeps.
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
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.
Figure 4-15 Sample Diagnostic Menu Screen
2.If the vehicle being tested supports both types of monitors, following screen displays.
Figure 4-16 Sample I/M Readiness Screen
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