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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
     burns.

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.


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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
     the vehicle.

8.  Always follow the manufacturer’s recommended
     removal and replacement procedures when
     working with input sensors and output actuators.


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