Full Product Manual

42
N/A – the monitor is not supported on the vehicle.
The green, yellow and red LEDs provide a quick way to help you determine
if a vehicle is ready for an Emission Test.
The LED and audio tone are interpreted as below:
LED Interpretation
GREEN LED – indicates that engine systems are “OK” and operating
normally (the number of Monitors supported by the vehicle that have run
and performed their self-diagnostic testing is in the allowed limit. MIL is
off. ).There are neither stored nor pending DTCs. The vehicle is ready for
an Emissions Test, and there is a good possibility that it can be certified.
YELLOW LED – with MIL off, there may be three possible conditions to
cause the yellow LED to light.
 If a “Stored” Diagnostic Trouble Code is causing the Yellow LED to
light, it is still possible that the vehicle will be allowed to be tested for
emissions and certified.
 If a “Pending” Diagnostic Trouble Code is causing the Yellow LED to
light, it is still possible that the vehicle will be allowed to be tested for
emissions and certified.
 The Yellow LED will also light if the monitors do not complete their tests.
Each state’s emissions standards differ on the number of tested
monitors needed to meet vehicle emissions compliance.
NOTE
Confer with your automotive technician about the status results of each
monitor to determine if the vehicle is ready for your state’s emissions test.
RED LED – indicates there is a problem with one or more of the vehicle’s
system. The test of a vehicle resulting in a lit red LED lighting is not ready
for an Emissions Test. The red LED is also an indication that there are
DTCs present. The MIL lamp on the vehicle’s instrument panel will light
steady. The problem that is causing the red LED to light must be repaired
before an Emissions Test can be performed. It is also suggested that the
vehicle be inspected/repaired before driving the vehicle further.