Full Product Manual

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.

If the red LED lights, there is a definite problem present in the system(s). In

this case, you have the following options:

 Repair the vehicle yourself. If you are going to perform the repairs

yourself, proceed by reading the vehicle service manual and following

all its procedures and recommendations.

 Take the vehicle to a professional to have it serviced. The problem(s)

causing the red LED to light must be repaired before the vehicle

undergoes Emissions Testing.

Audio Tone Interpretation

The audio tone is configured according to the I/M Readiness Status.

Table 3-1

LED Light

Audio Tone

Beep Interval

Green LED

Two long beeps

5 seconds