Safety With Emissions/Computerized Control Systems
Keep these 8 safety precautions in mind when working with emissions/computerized control systems.
1. After the engine has been running, the EGR valve
may be very hot. If it needs to be replaced, let the
engine cool down to avoid burning your hands.
2. The catalytic converter normally operates at a
higher temperature than the exhaust. Always be
extra careful when working around a catalytic
converter to eliminate the possibility of severe
3. Always use compressed air and an air hose to blow
out valves, tubes, or other clogged passageways on
emission control devices.
4. At times when diagnosing the emission control
system, the engine must be running. Be careful not
to drop anything into the spinning parts or in the
fan blades. Also, remember to stay clear of the
electric fan, as it may go on unexpectedly.
Back to Safety
5. Whenever working with sensors and actuators, be
sure to wear OSHA-approved safety glasses.
6. Often a digital meter is needed to check
resistances and/or voltage drops on input
sensors and output actuators. Always be careful
not to get the meter wires tangled in moving parts.
7. When recommended, use a grounding strap to
make sure your body is grounded to the frame of
8. Always follow the manufacturer’s recommended
removal and replacement procedures when
working with input sensors and output actuators.