Test Joe
A technician connects one lead of a DMM (digital multimeter) to the positive (+) terminal of a battery and the other meter lead to the "B" terminal of the starter solenoid and then cranks the engine. During cranking, the voltmeter displays a reading of 878 mV. Technician A says this reading indicates the positive battery cable has very high resistance. Technician B says this reading indicates that the starter armature is defective. Who is right?
A only
Technician A says a solution of solution of baking soda and water is used as a neutralizing agent on the surface of the battery. Technician B says the soda solution will not harm the battery electrolyte. Who is right?
A only
Technician A says a voltage-drop test of the charging circuit should be performed when current is flowing through the circuit. Technician B says to connect the leads of a voltmeter to the positive and negative terminals of the battery to measure the voltage drop of the charging system. Who is right?
A only
Technician A says an aiming screen will work on any headlight design to aim the headlights. Technician B says mechanical aimers are used on HID (High Intensity Discharge) headlights. Who is right?
A only
Technician A says not to trust built-In hydrometer (Delco Eye) color as an indicator of battery state of charge. Technician B says the battery is charged when the built-in hydrometer dot is green. Who is right?
A only
Technician A says the CANDi (Controller Area Network Device Interface) module used on GM vehicles will flash an LED rapidly if communication is detected. Technician B says the Chrysler Programmable Controller Interface (PCI) is a three-wire communication protocol that connects at the OBD-II DLC terminal 2. Who is right?
A only
Technician A says to check a fusible link, you pull on each end to see if it stretches. Technician B says when a fusible link melts, it's always visible. Who is right?
A only
Technician A says to test for maximum current output, the battery must be loaded to force the generator to produce its maximum output. Technician B says after disassembly, all AC generator internal components should be tested using an ammeter. Who is right?
A only
The owner of a vehicle equipped with adaptive cruise control complains that the cruise control often stops working when driving over a bumpy road. Technician A says the brake switch may be out of adjustment. Technician B says a defective control module is the cause. Who is right?
A only
Two technicians are describing battery charging. Technician A says to remove the surface charge from a recently charged battery and apply a 300-ampere load across the adapters for 15 seconds. Technician B says to remove the surface charge from batteries, which have been in storage. Who is right?
A only
Two technicians are discussing OEM (original equipment manufacturer) Navigation systems; such as GM OnStar. Technician A says metal-type tinting can affect the navigation system operation. Technician B says most navigation systems are offered at no cost. Who is right?
A only
Two technicians are discussing a battery's state of charge. Technician A says a specific gravity of 1.225 at 80°F indicates that a battery's state of charge is approximately 75%. Technician B says you can use a hydrometer to check battery state of charge on a maintenance free battery. Who is right?
A only
Two technicians are explaining how to service an audio entertainment system. Technician A says that braided ground wire is best for repair and installation to help reduce interference. Technician B says to use a larger ground wire to reduce interference. Who is right?
A only
A technician is checking the continuity of a 30-amp circuit breaker in a power convenience system with a DMM (Digital Multimeter). Technician A says the current from the ohmmeter will close the circuit breaker. Technician B says the ohmmeter should read infinity if the circuit breaker is good. Who is right?
Neither A nor B
Technician A says when checking a non-working component, one should check downstream from the component for an open circuit. Technician B says you should use an ammeter to check for an opening in a circuit. Who is right?
Neither A nor B
Two technicians are discussing a typical non-electronic fuel gauge. Technician A says if the ground wire connection to the fuel tank sending unit becomes rusty or corroded, the fuel gauge will read full or near full. Technician B says if the power lead to the fuel tank sending-unit gets grounded, the fuel gauge should go to empty. Who is right?
Neither A nor B
Two technicians are explaining how to adjust the drive belt when replacing an alternator. Technician A says on a serpentine belt, the tension is adjusted by moving the tensioner up or down. Technician B says to recheck tension run the engine for one hour to see if the belt is in the specified range for a used drive belt. Who is right?
Neither A nor B
Why should you never touch the tip of a halogen bulb?
Oil from your finger can cause shortened bulb life.
When using the ammeter function of a DMM (Digital Multimeter), the red lead should be connected to what area of the connector?
Side closest to positive side of battery
A RKE (remote keyless entry) system does not work. Technician A says the battery in the remote key fob could be dead. Technician B says the key fob transmitter or transponder may have to be programmed. Who is right?
Both A and B
A heated steering wheel is being diagnosed. Technician A says most heated steering wheels do not work if the temperature inside the vehicle is about 90°F (32°C) or higher. Technician B says to check for voltage and ground at the terminals leading to the heating element. Who is right?
Both A and B
A vehicle has a starting problem. Technician A says you can use the scan tool snap shot feature to monitor charging system operation on a test drive. Technician B says using a digital multimeter (DMM) may not capture glitches found with a scan tool or data recorder. Who is right?
Both A and B
A vehicle with a factory Navigation system does not provide voice directions but the audio system works. Technician A says the problem could be a defective speaker. Technician B says the customer turned off the audio control. Who is right?
Both A and B
An XM Satellite radio has poor reception. Technician A says a poor antenna ground could be the cause. Technician B says high trees, mountains or tall buildings can interfere with reception. Who is right?
Both A and B
Technician A says a break-out box (BOB) is used to access the BUS terminals when using a scan tool to test control module circuits. Technician B says a typical 38-cavity diagnostic connector is found in the engine compartment on many luxury model vehicles. Who is right?
Both A and B
Technician A says a power seat motor can be tested using a fused jumper lead. Technician B says a power seat motor can be tested using a clamp-on ammeter. Who is right?
Both A and B
Technician A says high-intensity discharge (HID) headlights are generally brighter and have a blue tint. Technician B says a defective turn signal bulb on one side can cause the turn signal on that side not to blink. Who is right?
Both A and B
Technician A says many late model vehicles with OBD II (On Board Diagnostics version 2) require an interface device to connect the vehicle computers with a scan tool. Technician B says some OEMs (original equipment manufacturers) use a laptop computer for diagnosis. Who is right?
Both A and B
Technician A says the alternator voltage output can be tested using the factory scan tool. Technician B says the DMM is connected across the battery terminals for a voltage output test. Who is right?
Both A and B
Technician A says you aim HID (High Intensity Discharge) headlights on a level floor with an unloaded vehicle. Technician B says when aiming any headlights, you must follow the state inspection specifications. Who is right?
Both A and B
Technician A says, to reduce circuit complexity when diagnosing a security system, break down the system into its sub-circuits, then check only those related to the problem. Technician B says the problem may be in the RKE (remote keyless entry) system. Who is right?
Both A and B
The figure on the right shows a belt tensioner with four lines to indicate belt wear and the need for replacement. Technician A says upon installation of a new belt, the three line marks close to each other should be very close to the ARROW on the base. Technician B says the belt should be replaced if the single line mark lines up with the ARROW on the base. Who is right?
Both A and B
The left front turn signal light does not flash, and the left rear turn signal light flashes faster than normal. Technician A says the left front bulb could be defective. Technician B says there could be an open circuit between the switch and the left front bulb. Who is right?
Both A and B
Two technicians are discussing a charging system low output complaint. Technician A says to check for high resistance in wiring between the alternator and battery using a voltage-drop test. Technician B says if the charging system is not charging properly, you should check the alternator bearings for magnetism. Who is right?
Both A and B
Two technicians are discussing an alternator with zero output. Technician A says the field circuit may have an open circuit. Technician B says the fusible link may be open from the battery to the alternator. Who is right?
Both A and B
Two technicians are explaining the cause of slow cranking and high current draw. Technician A says an engine bearings could be the cause. Technician B says the starter motor could be binding or defective. Who is right?
Both A and B
Two technicians are explaining the process of starting a vehicle with a dead battery using a jump box. Technician A says the last connection made should always be on the engine block or bracket of the dead battery vehicle. Technician B says many vehicles use a special connection far away from the battery. Who is right?
Both A and B
A dash indicator warning lamp does not light when the key is in the ON or START positions. What should you check first?
Bulb
Using a DMM (Digital Multimeter), a fully charged 12 volt battery should indicate how much voltage on the open circuit voltage (OCV) test?
12.6 volts
When checking the rear window defroster electrical grids, what level of amperage draw would you measure?
20 to 30 amperes
A vehicle is equipped with automatic folding mirrors. The owner complains that while driving, one mirror would fold in without the button being depressed. Technician A says the mirrors are out of adjustment. Technician B says that mirror had been manually pushed out and did not lock. Who is right?
B only
All the gauges in the instrument panel are inoperative. Technician A says to check the sending units. Technician B says to check the fuse for the instrument panel. Who is right?
B only
Technician A says a defective HVAC (Heater ventilator air conditioning) high speed blower motor relay could prevent high and low speed blower operation. Technician B says a defective (open) blower motor resistor can prevent low speed blower operation and permit normal high speed operation. Who is right?
B only
Technician A says a loose serpentine alternator drive belt could cause overcharging. Technician B says undersized wiring between the alternator and the battery could cause undercharging. Who is right?
B only
Technician A says it is abnormal for a battery to self-discharge when there is no load such as a computer memory. Technician B says some OEMs (original equipment manufacturers) specify a maximum allowable battery drain (parasitic draw) based on the reserve capacity of the battery. Who is right?
B only
Technician A says proper starter operation depends on the battery being at a 95% charge and battery cables being of the correct size (gauge) and having no more than 0.8-volt drop. Technician B says voltage-drop testing includes cranking the engine, measuring the drop in voltage from the battery to the starter, and measuring the drop in voltage from the negative terminal of the battery to the engine block. Who is right?
B only
Technician A says to crank the engine for no more than 60 seconds at a time when performing a current draw test. Technician B says, before doing a current draw test, the battery must be sufficiently charged to at least 75% charge. Who is right?
B only
Technician A says you do not have to solder a repaired wire. Technician B says wire insulation damage is sometimes found where the wire passes through an opening in a metal part. Who is right?
B only
The fuse controlling the brake and turn-signal lights on a vehicle pulling a trailer constantly fail. Technician A says low voltage at the flasher unit or the wrong flasher could be the cause. Technician B says the fuse is not the right amperage for this combination. Who is right?
B only
The starter motor on a 6-cylinder engine is being tested for current draw. The current draw was measured at between 160-200 amperes during cranking. Technician A says the starter is defective and should be replaced. Technician B says this is normal current draw for a starter motor for a 6-cylinder engine. Who is right?
B only
Two technicians are discussing testing a battery using an electronic conductance or continuity tester. Technician A says some of these testers can load test a battery. Technician B says you need to make sure that the ignition switch and all accessories are off. Who is right?
B only
Two technicians are discussing the reprogramming of a key fob or transmitter used with a RKE (remote keyless entry) system. Technician A says keyless entry system keys do not require programming when replaced. Technician B says that on some system key replacements, a factory scan tool is required. Who is right?
B only
If the battery terminals are corroded, what tool is used to remove the battery cable?
Battery connector puller
The code "BL" on a wiring diagram means what wire color?
Blue
A technician finds a blown fuse in the driver information circuit. What should he do next?
Check affected circuit for a short to ground
When jump starting a vehicle using jumper cables with a dead battery,what is the correct procedure?
Connect (+) positive to (+) positive and (-) negative to (-) negative
Why should the lights be turned on when checking for ripple voltage or AC current from the alternator?
Create electrical load
What is the first and most important step when servicing an air bag?
Disconnect the battery negative cable
A technician is checking the wiring of an instrument cluster using an ohmmeter. The leads should be placed ________ with the circuit or component being tested with the power ____________.
In parallel, OFF
Electrical feedback is usually a result of what condition?
Poor ground
What type of solder is required to repair the instrument panel wiring?
Rosin core
What is the starter control circuit voltage drop test is used to test?
Wiring and connections