Emissions Shut Down Operation (If Equipped):
The Onyx Emissions Shut-down System is a safety feature that serves multiple purposes. The
system is designed to shut the engine down when the emissions readings at the exhaust are too
high to safely operate the machine in an indoor environment. Secondly, the System is designed to
shut the engine down in the event that the O2 sensor has failed or the emissions sensor is lacking
communication with the O2 sensor (Pic. 6).
These two functions are indicated by:
1. Emissions too high: DANGER! The red LED indicator light on the emissions box will light
up (Solid/Constant) for about one minute before shutting the engine down. The reason for
the time delay is to allow the engine to begin running within the expectable emissions range
if the condition that triggered it was only temporary allowing the engine to continue running.
See the Trouble Shooting section in the EnviroGard manual for causes (pic. 6).
2. Communication failure with O2 sensor: DANGER! The red LED indicator light on the
emissions box will light up (Blinking/pulsing) for about a minute before shutting the engine
down. This indicates to the operator that either the O2 sensor has failed or the emissions
box is not receiving a signal from the O2 sensor which could be a loose connection or
damaged wiring between the two (Pic. 6).
SECTION (5) MAINTANENCE AND ADJUSTMENTS: (See EnviroGard manual for engine maintenance)
**SEE maintenance log near end of this manual (Advised to make copies)**
Emission Control Information
To protect the environment in which we will live, the manufacturer has incorporated (1)
crankcase emission and (2) exhaust emission control systems (EM) in compliance with
applicable regulations of the United States Environmental Protection Agency and
California Air Resources Board.
1. Crankcase Emission Control System. A sealed-type crankcase emission control system is
used to eliminate blow-by gases. The blow-by gases are led to the breather chamber
through the crankcase. Then, it is led to the air cleaner. Oil is separated from the gases
while passing through the inside of the breather chamber from the crankcase, and then
returned back to the bottom of crankcase.
2. Exhaust Emission Control System. The exhaust emission control system applied to this
engine consists of a carburetor and an ignition system having optimum ignition timing
characteristics. The carburetor has been calibrated to provide lean air/fuel mixture
characteristics and optimum fuel economy with a suitable air cleaner and exhaust system.
WARNING! Tampering with Emission Control System Prohibited: Federal law and
California State law prohibits the following acts or the causing thereof: (1) the removal or
rendering inoperative by any person other than for purposes of maintenance, repair, or
replacement, of any device or element at design incorporated into any new engine for the
purpose of emission control prior to its sale or delivery to the ultimate purchaser or while it
is in use, or (2) the use of the engine after such device or element of design has been
removed or rendered inoperative by any person.
