Heavy Duty Truck Systems – Chapter 30 – Lecture Summary & Practice Questions
When does an ATC light illuminate? - correct answer ✔✔whenever a spinout condition occurs
What type of tractor ABS is required to support most antirollover and directional stability
control electronics? - correct answer ✔✔6S/6M
Which of the following provides the most critical input signal to the ABS module? - correct
answer ✔✔wheel speed sensor
Which of the following is the control component in an ABS modulator valve? - correct answer
✔✔solenoid or motor
Which of the following ABS channel configurations is required in a truck equipped with stability
control electronics (SCE)? - correct answer ✔✔6S/6M
What is the maximum modulation speed of a typical air brake ABS? - correct answer ✔✔7 times
per second
Technician A says that in a true EBS, the brake pedal does no more than produce an electrical
signal to the EBS control module. Technician B says that current FMVSS 121 legislation requires
that when EBS is used on North American highways, it is in addition to pneumatic controls. Who
is correct? - correct answer ✔✔both A and B
Which of the following is the main output device on a truck ABS? - correct answer
✔✔modulator assembly
Which of the following is true of the ABS tractor warning light? - correct answer ✔✔It
illuminates when the ignition key is turned on.
When does an ATC light illuminate? - correct answer ✔✔whenever a spinout condition occurs
What type of tractor ABS is required to support most antirollover and directional stability
control electronics? - correct answer ✔✔6S/6M
Which of the following provides the most critical input signal to the ABS module? - correct
answer ✔✔wheel speed sensor
Which of the following is the control component in an ABS modulator valve? - correct answer
✔✔solenoid or motor
Which of the following ABS channel configurations is required in a truck equipped with stability
control electronics (SCE)? - correct answer ✔✔6S/6M
What is the maximum modulation speed of a typical air brake ABS? - correct answer ✔✔7 times
per second
Technician A says that in a true EBS, the brake pedal does no more than produce an electrical
signal to the EBS control module. Technician B says that current FMVSS 121 legislation requires
that when EBS is used on North American highways, it is in addition to pneumatic controls. Who
is correct? - correct answer ✔✔both A and B
Which of the following is the main output device on a truck ABS? - correct answer
✔✔modulator assembly
Which of the following is true of the ABS tractor warning light? - correct answer ✔✔It
illuminates when the ignition key is turned on.
