Automobile Chapter 24

What is this problem (A)

Vacuum tear

What is this problem (C)

Loose Connection

True or False? A hard failure is a problem that is always present in a vehicle computer system and does not come and go with varying conditions.

True

True or False? Datastream values produced by the vehicle's computer give electrical operating values of sensors, actuators, and circuits.

True

True or False? When using troubles codes retrieved with a scan tool to perform a vehicle repair, always correct the cause of the lowest number diagnostic trouble code first

True

Results when the signal reaching the on-board computer has more voltage, more current, or a greater frequency signal than normal. A. High-input failure B. Improper range/ performance failure C. Low-input failureC. Low-input failure

A. High-input failure

On-board diagnostics systems generation one (OBD I) had all of the following capabilities except _____. A. detected weak or partial failures in circuits and components B. monitored emissions-related components and systems C. detected major problems in circuits and components D. provided diagnostic trouble codes to aid technicians in vehicle diagnosis

A. detected weak or partial failures in circuits and components

The failure recorder in OBD II systems records the number of times the _____ since the last time the trouble code was set A. engine reached operating temperature B. crankshaft revolved C. engine valves opened and closed D. vehicle brakes were applied

A. engine reached operating temperature

Loose, dirty, or corroded connections that cause many computer system failures, especially intermittent failures, are located by performing a _____ test. A. wiggle or flex B. compression C. battery load D. emissions

A. wiggle or flex

Normally, diagnostic trouble codes will be automatically erased after _____ engine starts or warm-ups. A. 1-10 B. 30-50 C. 100-250 D. 500-1,000

B. 30-50

A malfunction indicator light (MIL) is flashing continuously in an OBD II equipped vehicle. Technician A says this problem is not critical but should be repaired. Technician B says the flashing MIL means the trouble could damage the catalytic converter and is, therefore, considered critical. Who is right? A. A only. B. B only. C. Both A and B. D. Neither A nor B.

B. B only.

Results when a sensor or actuator is producing values slightly lower or higher than normal. A. High-input failure B. Improper range/ performance failure C. Low-input failure

B. Improper range/ performance failure

In late-model vehicles, where is the data link connector located? A. In the vehicle's trunk. B. Under the dash, where it is accessible from the driver's seat. C. In the engine compartment. D. Under the passenger's seat.

B. Under the dash, where it is accessible from the driver's seat.

If the on-board diagnostics system finds any abnormal values, it will store a(n) _____. A. photograph of the failed component or system B. diagnostic trouble code C. vehicle identification number D. operating parameter

B. diagnostic trouble code

A(n) _____ is an acceptable minimum and maximum value for a circuit. A. duty cycle B. operating parameter C. freeze frame D. fault designation

B. operating parameter

The standardized data link connector used with OBD II systems has _____ pins. A. four B. sixteen C. eighteen D. None of the above.

B. sixteen

A scan tool or laptop running _____ software is necessary to access additional computer information about trouble codes, system tests, and system performance in European vehicles. A. OBD I B. failure record C. European on-board diagnostics (EOBD) D. All of the above.

C. European on-board diagnostics (EOBD)

Results when the signal reaching the on-board computer has a voltage, current, or signal frequency below normal operating parameters. A. High-input failure B. Improper range/ performance failure C. Low-input failure

C. Low-input failure

Which of the following statements regarding on-board diagnostics systems generation two (OBD II) is not true? A. They are designed to keep the vehicle running efficiently for at least 100,000 miles. B. They can detect part deterioration. C. They produce more complex diagnostic trouble codes with 16-20 characters compared to OBD I systems. D. They use computers with greater processing speed, more memory, and more complex programming compared to OBD I systems.

C. They produce more complex diagnostic trouble codes with 16-20 characters compared to OBD I systems.

A basic scan tool is designed to read and erase _____. A. bad sensors signals B. atmospheric measurement values C. diagnostic trouble codes D. vehicle operating parameters

C. diagnostic trouble codes

All of the following statements regarding reading an OBD II diagnostic trouble code are true except _____. A. the last two digits refer to the specific fault designation B. the letter indicates the general function of the affected system: body, chassis, powertrain, or network C. the second number indicates the vehicle's country of manufacture D. the first number indicates whether the code is a standard (SAE) code or a nonuniform code

C. the second number indicates the vehicle's country of manufacture

What is this problem (E)

Computer Failure

What is this problem (F)

Coroded Connector

OBD II systems can produce over _____ engine performance-related trouble codes. A. 50 B. 100 C. 300 D. 500

D. 500

A modern on-board diagnostics system continuously scans its input and output circuits to detect an incorrect _____ A. current B. voltage C. resistance D. All of the above

D. All of the above

A(n) _____ test uses the scan tool to order the vehicle's computer to energize specific output devices with the engine on or off. A. freeze frame B. wiggle or flex C. battery load D. actuator diagnostic

D. actuator diagnostic

With a scan tool connected to the vehicle, a switch diagnostic test involves activating various switches while the scan tool _____. A. measures crankshaft and camshaft speed B. sends a high-voltage signal to the switch's system computer C. measures the emission-related parameters produced by the switch's operation D. monitors the switch's operation and indicates if the switch is working normally

D. monitors the switch's operation and indicates if the switch is working normally

What is this problem (D)

Disconnected connection

What is this problem (G)

Failed Actuator

What is this problem (B)

Failed Sensor

True or False? Eighty percent of all engine performance problems are caused by faults in the on-board computer system or one of its sensors.

False

What is this problem (H)

Short ground