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Page 5B
With the increased sophistication of today's emission control systems,
many more solenoids are used than ever before.
Air injection, EGR Action,
and throttle positioning are a few examples of the usage of solenoids.
Basically a solenoid converts an electrical signal into mechanical
movement. Hence they can be used to move valves or repositlon the
throttle. Since they are electrlcally operated, your Craftsman
Voltmeter and Ohmmeter can be used in conjunction with your vehlcle service
manual to confirm their proper operation.
The service manual will tell
when voltage should be present at the solenoid and thevalue to activate
it. The Ohmmeter can check whether or not the coil in the solenoid is open
or shorted.
Follow your vehicle service manual's instructions in all cases.
The OHMS scale is used to test the various lamps in the vehicle (headlamps,
parking lamps, convenience lamps, etc.) To test the lamps, remove the
lamp from the socket or otherwise disconnect from the circuit to prevent
possible
damage to the analyzer.
CONNECTIONS:
i.
Insert the white plug OHMS lead into the corresponding tester socket,
Connect the RED and BLACK clips to the lamp under test.
Some lamps
have two filaments and each must be tested separately.
3.
Set the Function Selector switch to the OHMS position.
4,
Set the Range Selector Switch to the LOW scale.
The cold filament
resistance will read very low--typically less than 10 OHMS.
5.
If the meter reads oo
, (extreme right hand side of the scale) the
filament is open-clrculted and the lamp must be replaced.
Test Number 34F--Motor Windings
The OHMS scale can be used to test the windings of many of the motors
used in today's vehicles such as the blower, wiper, headlamp doors, and
power window motors.
Always make certain when testing the suspect motor
that it is completely disconnected from the vehicle.
This will prevent
false readings as well as possible damage to the Analyzer.
With the guidance of your vehicle service manual you will be able to
'
h
diagnose an open winding, a shorted windlng, or a winding shorted to t e
motor frame.
Your vehicle service manual will specify what resistance in
ohms should be present across the various motor leads. These values will
typically be low in value, hence the X i position of the Craftsman Analyzer
Range Selector should be used,
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