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2. Run the wire leads to the passenger front seat and connect the jack from each
wire lead into the control box. Match the color to the number, i.e., the red jack is
plugged into input jack #1, green is plugged into #2, and so forth.
3. Using the Location Identifier Note Pad, make notes of the location and
corresponding color for each microphone/clamp. This will enable you to properly
assign the problem noise to the proper malfunctioning part while conducting the
road test.
4. Using the nylon and velcro ties that are provided (more can be purchased from
your distributor when needed), secure the leads under the car so that they do not
drag on the pavement. Be careful to avoid running the leads against the exhaust
pipe or any other location which would cause heat damage.
5. CAUTION! It is highly recommended that the technician wearing the
headphones sits on the passenger side and use a second person to drive
the car. It is against many state motor vehicle laws to operate a vehicle
while wearing headphones.
6. Lower the vehicle and conduct the road test. During test, turn on the "on/off
volume control" switch. On the #1 setting, (Red color), adjust volume control to
desired level. Various levels may reveal additional sounds and problems. Initially,
make a mental note of the sounds that you hear. Now rotate selection switch to
the next channel that indicates a wheel bearing. You may make instant cross-
comparisons between the two channels by rotating the selection switch back and
forth between #1 and #2 channel. Now test the third channel. Then test the fourth,
fifth, and sixth. After making the cross-comparisons between all four wheel
bearings, make a note of the color / channel number where the problem exists.
7. Next listen to the other two channels to assure that there is not a problem sound
located in these areas.
Important! Make notes while driving as to what is heard (rattles, squeaks, grinds,
whines, etc.) at each channel. When you return to your shop, then zero in on the
exact location of the problem.
8. Fuel injectors – it is quick and simple to hook up the ChassisEAR clamps on the
fuel injectors. The "tapping" solenoids are heard. If a clear metal-to-metal "ringing"
sound is heard then the injector is clean. If the "needle" inside the solenoid is
making a dull "thud" then a deposit buildup exists inside the injector, where the
needle is hitting the buildup instead of metal.
A cleaning is needed.
It is important to listen to the injectors before and after cleaning in case one is still
dirty after cleaning.
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