CH107 ABS DIAGNOSIS AND SERVICE
EXAM QUESTIONS AND ANSWERS
Tech A says that the test drive is an important diagnostic step to verify customer ABS
concerns. Tech B says that if the red brake warning light is on, the conventional brake
system should be repaired first, before driving. Which Tech is correct? - Answer-Both
How are the anti-lock system valves activated on a Kelsey-Hayes 4WAL system? -
Answer-Pulse Width Modulation
The red brake warning lamp is dimly lit on a RWD pickup with RWAL. Which is most
likely the cause? - Answer-ABS System Fault
A wheel speed sensor is producing lower than expected voltage as the wheel rotates.
Which of these is NOT a possible cause? - Answer-All of these are possible causes
When observing WSS output with an oscilloscope, most sensor should produce -
Answer-An AC sine wave that increases in frequency as wheel speed increases
What reference voltage (supply voltage) is used with digital wheel speed sensors? -
Answer-12 Volts DC
Tech A says no wheel speed sensors are adjustable. Tech B says improper tire size
can cause ABS system faults. Which Tech is correct? - Answer-Tech B
Tech A says interference from cell phone or CB antenna may the disrupt the ABS
control unit. Tech B says many system problems can be located with a thorough visual
inspection. Which Tech is correct? - Answer-Both
A good wheel speed sensor should produce is at least ---- with the wheel turning. -
Answer-.1 Volt DC
1996 and newer vehicles need to use a scan tool to retrieve ABS diagnostic trouble
codes. - Answer-True
The red brake warning lamp is on and the amber ABS lamp is off. Tech A says that a
fault is possible in the base brake system. Tech B says that the red brake warning lamp
can be turned on by a low brake fluid level in the master cylinder. Which Tech is
correct? - Answer-Both
Two Techs are discussing magnetic-type wheel speed sensors. Tech A says that wheel
speed sensors are magnetic. Tech B say that the toothed sensor ring is magnetic.
Which Tech is correct? - Answer-Tech A
EXAM QUESTIONS AND ANSWERS
Tech A says that the test drive is an important diagnostic step to verify customer ABS
concerns. Tech B says that if the red brake warning light is on, the conventional brake
system should be repaired first, before driving. Which Tech is correct? - Answer-Both
How are the anti-lock system valves activated on a Kelsey-Hayes 4WAL system? -
Answer-Pulse Width Modulation
The red brake warning lamp is dimly lit on a RWD pickup with RWAL. Which is most
likely the cause? - Answer-ABS System Fault
A wheel speed sensor is producing lower than expected voltage as the wheel rotates.
Which of these is NOT a possible cause? - Answer-All of these are possible causes
When observing WSS output with an oscilloscope, most sensor should produce -
Answer-An AC sine wave that increases in frequency as wheel speed increases
What reference voltage (supply voltage) is used with digital wheel speed sensors? -
Answer-12 Volts DC
Tech A says no wheel speed sensors are adjustable. Tech B says improper tire size
can cause ABS system faults. Which Tech is correct? - Answer-Tech B
Tech A says interference from cell phone or CB antenna may the disrupt the ABS
control unit. Tech B says many system problems can be located with a thorough visual
inspection. Which Tech is correct? - Answer-Both
A good wheel speed sensor should produce is at least ---- with the wheel turning. -
Answer-.1 Volt DC
1996 and newer vehicles need to use a scan tool to retrieve ABS diagnostic trouble
codes. - Answer-True
The red brake warning lamp is on and the amber ABS lamp is off. Tech A says that a
fault is possible in the base brake system. Tech B says that the red brake warning lamp
can be turned on by a low brake fluid level in the master cylinder. Which Tech is
correct? - Answer-Both
Two Techs are discussing magnetic-type wheel speed sensors. Tech A says that wheel
speed sensors are magnetic. Tech B say that the toothed sensor ring is magnetic.
Which Tech is correct? - Answer-Tech A
