Question 1

All of the following statements about a TPMS system are true, EXCEPT:

Accepted Answer

TPMS systems are designed to alert drivers to significant changes in tire pressure, not normal pressure variations due to ambient temperature changes.

Question 2

The National Highway Traffic Safety Administration requires the TPMS to notify the driver when any tire is:

Accepted Answer

The National Highway Traffic Safety Administration (NHTSA) requires the Tire Pressure Monitoring System (TPMS) to alert the driver when any tire is 25% below the recommended pressure on the placard.

Question 3

Which piece of U.S. legislation is responsible for the TPMS?

Accepted Answer

The TREAD Act (Transportation Recall Enhancement, Accountability, and Documentation Act) was enacted in response to safety concerns and requires the implementation of Tire Pressure Monitoring Systems (TPMS) in vehicles to enhance safety.

Question 4

All vehicles must comply with the TREAD Act, except:

Accepted Answer

The TREAD Act requires compliance from all vehicles except motorcycles, which are exempt from certain regulations under this act.

Question 5

Two technicians are describing the operation of the TPMS. Tech A says that the TPMS is a mechanical system used to monitor the air pressure inside a pneumatic tire. Tech B says that the TPMS is also referred to as remote tire pressure monitoring systems (RTPMS) or simply as run-flat
Indicators. Who is right?

Accepted Answer

The answer of Two technicians are describing the operation of...

Question 6

Where do you find the most accurate tire pressure specifications for TPMS operation?

Accepted Answer

The most accurate tire pressure specifications for TPMS operation are found on the placard located on the door jam, as it provides the manufacturer's recommended tire pressure for the specific vehicle.

Question 7

A TPMS monitors the tires for low air pressure and alerts the driver when one or more tires are lower than (or in some cases higher than) required by doing which of these?

Accepted Answer

A TPMS (Tire Pressure Monitoring System) typically turns on the yellow low-pressure indicator light to alert the driver when tire pressure is not within the recommended range.

Question 8

All of the following statements about indirect TPMS are true, EXCEPT:

Accepted Answer

Indirect TPMS is generally less expensive than direct TPMS because it uses the vehicle's existing ABS sensors to monitor wheel speed differences rather than requiring additional pressure sensors in each tire.

Question 9

Tech A says the direct TPMS measures tire pressure, sometimes via a sensor that is installed inside each wheel. Tech B says the indirect TPMS measures the air pressure indirectly by monitoring individual wheel speeds and other signals available in the vehicle using the ABS (antilock brake system) wheel speed sensors. Who is right?

Accepted Answer

Tech A is correct because direct TPMS uses sensors inside each wheel to measure tire pressure. Tech B is correct because indirect TPMS estimates tire pressure by monitoring wheel speeds using ABS sensors.

Question 10

How is the indirect TPMS system reset?

Accepted Answer

The indirect TPMS system is reset by pressing the calibration button, which recalibrates the system to the current tire pressure.

Question 11

The pressure sensors:

Accepted Answer

Pressure sensors can be used to display real-time tire pressures, providing drivers with important information about the condition of their tires.

Question 12

The mode of sensor operation where a very fast change in inflation pressure is detected and inflation pressure is sent to the control module approximately once a second is:

Accepted Answer

Alert mode is the mode of sensor operation where rapid changes in inflation pressure are detected, prompting the sensor to send data to the control module frequently, approximately once a second.

Question 13

The TPMS sensor that sends a signal to the receiver when exposed to a powerful electromagnetic force is the:

Accepted Answer

A magnetically triggered sensor is designed to send a signal when exposed to a powerful electromagnetic force.

Question 14

The valve stem-mounted sensor uses the valve stem as which of these?

Accepted Answer

The valve stem-mounted sensor uses the valve stem as a transmitter to send data from the sensor to the vehicle's monitoring system.

Question 15

Tech A says that the banded sensor is installed in the drop well of the wheel inside the tire and banded or clamped around the drop well of the wheel. Tech B says that the TPMS pressure sensor uses a lithium-ion battery. Who is right?

Accepted Answer

Tech A is correct because banded sensors are indeed installed in the drop well of the wheel inside the tire and are clamped around it. Tech B is also correct because TPMS pressure sensors typically use lithium-ion batteries to power the sensor.

Question 16

A special tool that is used to reset the sensors when rotating the tires is the:

Accepted Answer

The TPMS tester is a special tool that is used to reset the sensors when rotating the tires.

Question 17

The __________ measures the air pressure in a tire by monitoring wheel speeds.

Accepted Answer

The indirect system measures air pressure by monitoring wheel speeds, detecting differences that suggest a tire is under-inflated.

Question 18

Technician A says that there are two different types of direct tire pressure monitor sensors. Technician B says that some direct tire pressure sensors can receive and send signals to the TPMS control unit. Who is correct?

Accepted Answer

Technician A is correct because there are indeed two types of direct TPMS sensors: clamp-in and snap-in. Technician B is also correct because some direct TPMS sensors are capable of both receiving and sending signals to the TPMS control unit.

Question 19

Technician A says that you do not need to be concerned about damaging a TPMS sensor if servicing a tire/wheel assembly. Technician B says that some sensors are attached to the valve stem while others are clamped into position in the wheels drop center. Who is correct?

Accepted Answer

Technician B is correct because TPMS sensors can be attached to the valve stem or clamped into the wheel's drop center, and care must be taken to avoid damaging them during tire service.

Question 20

TPMS sensors can be mounted by which of the following methods?

Accepted Answer

TPMS sensors can be mounted using the valve stem mounted method or the banded method. Glue mounting is not a recognized method for TPMS sensors.

Quiz 6: Tire Pressure Monitoring Systems