Electrical/Electronic Systems study Guide 2023/2024

The fault shown in the above circuit is: (pg. 81) A. an open B. a short to ground C. too much capacitance D. too much resistanceanswers - B An air bag system is being serviced, Technician A says to disconnect the yellow SRS connectors at the front of the vehicle. Technician B says to disconnect and isolate the negative battery cable. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or Banswers - .B Which of these should be used when soldering electrician wiring connections? A. rosin core flux B. acid core flux C. sulfur core flux D. none of the aboveanswers - .a When testing computer-controlled systems, a digital multimeter should be used with an input impedance of at least: A. lOk ohms B. lOOk ohms C. 1 megohm D. 10 megohmsanswers - .d When troubleshooting a slow drain on the battery, which if these diagnostic tools should be used? A. Ohmmeter B. Ammeter C. Voltmeter D. Test fightanswers - .b The condition of a lead-acid battery is being checked. Technician A says to use a galvanometer. Technician B says to use a capacitive battery tester. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or Banswers - .b While testing a starting circuit on a 5.7L V8 engine, the technician finds that the engine cranks slowly. The starter current draw is 90 amps, and the battery voltage while cranking is 11 volts. What should the technician do next? A. Check for voltage drop of the starter motor circuit. B. Test the battery capacity. C. Replace the starter motor, as a short Is indicated. D. Determine the condition of the rs - .a Technician A says that a noisy alternator could be caused by a bad diode. Technician B says that a noisy alternator could be caused by a worn bearing. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or Banswers - .c The analog ohmmeter needle does not move when connected as shown above. (pg 82) This indicates that the rotor winding is: A. shorted B. grounded C. complete D. openanswers - .d A vehicle's tum signals flash too slowly. Technician A claims that the condition could be caused by a faulty flasher. Technician B says that a bulb may be the wrong type. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or Banswers - .c Technician A says a short circuit to ground in a circuit will decrease resistance. Technician B says a short circuit will Increase current flow. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or Banswers - .c The voltmeter meter in the circuit shown above reads 3.5 volts. (pg 82) Technician A says that a bad ground for the light could be the cause. Technician B says that high resistance in the circuit from the battery to the light could be the cause. Who is right?? A. Technician A only B. Technician B only C. Both A and B D. Neither A or Banswers - .b When using a voltmeter to check for voltage in a circuit, the voltmeter should first be connected to check for: A. source voltage. B. excessive resistance C. excessive amperage. D. a good rs - .a When checking the green eye of a sealed maintenance-free battery, no color seen indicates that the battery is: A. undercharged. B. charged properly. C. overcharged. D. rs - .a Both headlights on a vehicle are dim on high beam but are normal on low beam. Technician A says that a poor headlight ground could be the cause. Technician B says that a shorted headlight switch could be the cause. Who Is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or Banswers - .d The oil pressure light on a vehlole dashboard stays on whenever the engine is running. The oil pressure has been checked with a mechanical gauge and it is within specifications. Technician A says that the circuit between the indicator light and the pressure switch could be grounded. Technician B says that an open in the pressure switch Itself could be the cause. Who Is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or Banswers - .a Nothing happens when the ignition key Is turned to the START posltion In a vehicle with a good battery. Teohnician A says that If a clicking sound is heard when a jumper wire is 'connected between the battery and the solenoid 'S' terminal, a problem exists in the starter control circuit. Technician B says that if a jumper wire is connected between the battery and the soienold 'S' terminal and there Is no sound, the starter Is defective. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or Banswers - D. If a jumper wire is connected between the battery and the solenoid 'S' terminal and the engine cranks, there is a problem in the starter control circuit. If the solenoid makes a clicking sound, it Is operating properly and the problem may be with the starter. If no sound is heard, the solenoid is defective and should be replaced. A vehicle continues to trip the windshield wiper circuit breaker. Technician A says the cause could be a short circuit Technician B says that the cause could be binding wiper linkage. Who is right? A. Technician A only B. Teohnician B only C. Both A and B D. Neither A or Banswers - C. A circuit breaker will disconnect the circuit if the circuit has higher than normal current flow, which can be caused by a short in the circuit or a binding of the wiper linkage. Technician A says that a battery with an open circuit voltage of 12.1 volts Is fully charged. Technician B says that if the Indlcator on a sealed maintenance-free battery Is yellow, the battery shouid be charged. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or Banswers - D. A battery with a 12.1 volt reading is undercharged. Technician B is wrong because if the indicator is yellow on a sealed maintenance-free battery, it means that the fluid level is below the level of the hydrometer. The battery should not be charged and should be replaced. When performing a current draw test using an ammeter, a reading greater than that which was specified would indicate: A. excessive circuit resistance B. a decrease in olrcult resistance C. an open circuit D. a decrease in circuit voltageanswers - B. When performing a current draw test using an ammeter, a decrease in circuit resistance will cause a reading greater than what was specified. Technician A says that using a 20,000 ohm/volt analog meter ts a good choice for ECM clroult testing. Technician B says that oarefui use of a test light can determine the condition of a Throttle Position (TP) sensor. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or Banswers - D. An analog meter with a low input resistance should only be usedfor non-computer type circuits; a test light should never be used to diagnose sensor circuitry. Technician A says that an in-vehicle high-rate discharge battery load test shouid always be performed if a 12-volt battery if its condition is in questlon. Technician B says that the battery should be discharged (loaded) at twice its ampere hour rating. Who Is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or Banswers - D. The high-rate discharge (load) test of a battery. Is frowned upon by OEMs because of the likely hood of over stressing the alternator. If done with the battery removed (or disconnected) from the vehicle, the load applied should be three times the battery's ampere-hour rating or half of its CCA rating. All of the following are indications of an under-charged battery condition EXCEPT: A. slow cranking B. dim headlights C. short light bulb fife D. low ammeter indicationanswers - C. Short light bulb life and a battery that continually needs water ar indications of over charging. In the charging system shown above, the reading will show: (pg 84) A. charging output voltage B. indicator lamp operating voltage C. charging circuit voltage drop D. ignition switch voltageanswers - C. In the circuit shown in the illustration, the meter will show the charging circuit voltage drop from the alternator BAT terminal to the wire terminal or bus, to the positive battery post. The horns in the circuit shown above (pg 84) only blow when a jumper wire is connected between terminals 1 and 2 of the horn relay. Technician A says that a bad horn relay could be the cause. Technician B says that a ground in the circuit between the horn relay and the horn button could be the cause. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or Banswers - A. Connecting a jump