General Electric/Electronic System Diagnosis
An ohmmeter is connected across a fuse. A reading of infinite resistance indicates: a. A blown fuse b. Normal operation c. Continuity d. The ohmmeter is not configured properly
a. A blown fuse
During a parasitic draw test, the ammeter displays a consistent reading of 270mA. The reading drops to 30mA 30 seconds after the hood switch is disconnected. Technician A says the hood switch is defective and should be tested using an ohmmeter or continuity tester. Technician B says that disconnecting the hood switch simulates a closed hood and allows the electronic control unit to enter sleep mode. Who is right? a. Both b. Technician A c. Technician B d. Neither
a. Both
Circuits connected to an electronic control units should not be tested using a (an): a. Non-powered test light b. A logic probe c. Oscilloscope d. DVOM
a. Non-powered test light
Technician A says a voltmeter is used to check voltage drop. Technician B says a circuit should be powered OFF when checking for voltage drop. Who is right? a. Both b. Technician A c. Technician B d. Neither
b. Technician A
Technician A says that when checking parasitic draw, a reading of 800 milliamperes may indicate excessive key-off battery drain. Technician B says that no wait time is required after the ignition key is turned OFF before parasitic draw is checked. Who is right? a. Neither b. Technician A c. Technician B d. Null e. Both f. Parasitic draw measurements should be checked against manufacturer specifications to determine if a reading is abnormal. Some vehicle computers may require several minutes to enter their "sleep" mode before an accurate parasitic draw measurement may be taken. g. General Electrical/Electronic System Diagnosis
b. Technician A
Technician A says an ohmmeter is best tool to use for checking airbag resistance. Technician B says an ohmmeter's internal power source can cause unexpected airbag deployment If used. Who is right? Neither a. Always check manufacturer service information before performing testing on airbag systems. The internal power source of an ohmmeter may cause an airbag to deploy if the airbag resistance is a checked in this manner. b. Technician B c. Null d. Both e. Technician A f. General Electrical/Electronic System Diagnosis
b. Technician B
All the following statements are correct EXCEPT: a. A ohmmeter has its own internal power source. b. If an ohmmeter is not auto-ranging, the proper range must be selected using the meter's controls. c. An ohmmeter is connected across a component with power applied to the circuit. d. An ohmmeter is connected across a component with power removed from the circuit.
c. An ohmmeter is connected across a component with power applied to the circuit.
When using a test light to check a conventional lighting circuit, the test light lead should be connected to: a. The side of the circuit closest to the fuse b. A non-conductive surface c. Ground d. The positive side of the battery
c. Ground
Technician A says a test light is used to check for presence of voltage in a circuit. Technician B says a test light will display a visual representation of voltage changes over time. Who is right? a. Technician B b. Both c. Technician A d. Neither
c. Technician A
When checking for short circuits to ground, a (an) _________ may be connected in place of the circuit fuse. a. Jumper wire b. Voltmeter c. Test light d. Oscilloscope
c. Test light
An electrical component circuit is inoperative. The technician checks for voltage at the component and measures battery voltage. A known-good component is installed, but the circuit continues to remain inoperative. What is the least likely possible cause? a. The component ground circuit has excessive resistance b. The component ground circuit has an incomplete connection c. The replacement component is malfunctioning d. The component ground circuit has high voltage drop
c. The replacement component is malfunctioning
50 milliamperes is equivalent to: a. 500 amperes b. 5000 amperes c. 5 amperes d. .050 amperes
d. .050 amperes
