Craftsman 161.210400 Owner's Manual

Page 5BWith 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 mechanicalmovement. Hence they can be used to move valves or repositlon thethrottle. Since they are electrlcally operated, your CraftsmanVoltmeter and Ohmmeter can be used in conjunction with your vehlcle servicemanual to confirm their proper operation. The service manual will tellwhen voltage should be present at the solenoid and thevalue to activateit. The Ohmmeter can check whether or not the coil in the solenoid is openor 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 thelamp from the socket or otherwise disconnect from the circuit to preventpossible 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 lampshave 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 filamentresistance will read very low--typically less than 10 OHMS.5. If the meter reads oo , (extreme right hand side of the scale) thefilament is open-clrculted and the lamp must be replaced.Test Number 34F--Motor WindingsThe OHMS scale can be used to test the windings of many of the motorsused in today's vehicles such as the blower, wiper, headlamp doors, andpower window motors. Always make certain when testing the suspect motorthat it is completely disconnected from the vehicle. This will preventfalse readings as well as possible damage to the Analyzer.With the guidance of your vehicle service manual you will be able to' hdiagnose an open winding, a shorted windlng, or a winding shorted to t emotor frame. Your vehicle service manual will specify what resistance inohms should be present across the various motor leads. These values willtypically be low in value, hence the X i position of the Craftsman AnalyzerRange Selector should be used,