All of the following could cause a failure in an air ABS system except:
The warning light on a truck with anti-lock brakes comes on when the truck key is turned on, the truck started and stays on when the truck is moving. Which of the following could be the cause?
What happens if an ABS system component ceases to function?
Some ABS systems may use two micro processors. In these systems, both must agree on diagnosis and commands or the system will go into "failsafe" mode.
Technician A says some ABS systems use a series of light emitting diodes (LED''s) on a panel to indicate faults. Technician B says that the signal from the wheel sensors produce an A/C signal that is proportional to wheel speed. Who is correct?
Technician A says that wheel sensors are electromagnetic pulse generators used to obtain wheel speed information. Technician B says that the signal from the wheel sensors produce an A/C signal that is proportional to wheel speed. Who is correct?
If an ABS system has one modulator valve on a single avle, and one wheel is on ice and starts to look up, while the other is on dry pavement with good traction, the ABS system will:
ABS systems will help to correct for misadjusted and unbalanced brakes.
Some ABS systems may incorporate traction control with the addition of the correct ECU and solenoids.
ABS trouble codes may be caused by:
When applied on steering axles, functioning ABS systems provide for better steering control, preventing lock-up on slippery surfaces.
Technician A says that some ABS ECU uses a series of light emitting diodes (LED''s) in a diagnostic window to indicate fault codes in the ECU. Technician B says that the number of LEDs in the diagnostic window vary depending on the system. Who is right?
Technician A says that wheel and axle sensors are electromagnetic devices used to obtain vehicle speed information. Technician B says that when an ABS system is disabled, the vehicle goes into its standard braking mode. Who is right?
On anti-skid brake systems, "Fail Safe" refers to a vehicle''s ability:
Diagnosis of some anti-skid brake systems may be made with an on-board diagnostic system.
Anti-skid brake systems aid with foundation brake balance and timing.
The ECU and/or module used to control an ABS system may be mounted directly to the relay valve on some systems.
What happens when a failure is detected in an ABS system?
Once a failure is sensed by the ECU, the information is stored in memory until the
Technician A says that a broken wheel speed sensor wire can be fixed with a simple butt connector splice or equivalent. Technician B says that the proper repair is to replace the entire wheel speed sensor to fix the vehicle. Who is right?
An ABS system on a truck is being inspected. Technician A says that in many systems, there is one module per axle, which means that each axle brakes as one unit. Technician B says that in many truck ABS systems, there are two modules per axle, are designed to handle any differential in road friction situations when they occur. Who is right?
The modulation process of braking and the resulting actions of anti-lock brake systems involves three main sections. There are speed sensing, decision making, and brake ___________?
The National Transportation Safety Board (NTSB) requires:
A wheel sensor from an ABS system is being inspected. Technician A says that as the toothed wheel rotates, the sensor generates a simple DC signal. Technician B says that the waveform signal generated is AC and the signal is proportional to wheel speed. Who is right?
What happens if the ABS system ceases to function?
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