1.
ASE L3: Battery System
A hybrid vehicle is brought in with a complaint of reduced acceleration power. The BMS indicates a healthy state-of-charge, but power output is limited. Which component is MOST likely to cause this issue?
1 out of 55
2.
ASE L3: Battery System
A technician is diagnosing an HEV that has reduced electric driving range. After confirming the high voltage battery pack is fully charged, which of the following would be the BEST next diagnostic step?
2 out of 55
3.
ASE L3: Battery System
When diagnosing a battery electric vehicle (BEV) that experiences reduced drive power intermittently, what data parameter would be MOST useful for a technician?
3 out of 55
4.
ASE L3: Battery System
After a high-voltage battery repair, the technician notes that the battery cooling fan runs more frequently than before. What could be the cause?
4 out of 55
5.
ASE L3: Battery System
A technician is troubleshooting a high voltage battery issue where the battery does not seem to hold charge for the expected duration. Besides checking for parasitic drains, what other electrical measurements should be taken?
5 out of 55
6.
ASE L3: Battery System
A technician finds that a NiMH hybrid vehicle battery pack has decreased performance and poor charge acceptance. Which of the following is LEAST likely to cause this condition?
6 out of 55
7.
ASE L3: Battery System
A technician observes that a hybrid vehicle's high-voltage battery discharges more quickly than usual. The vehicle has not shown any error codes, and the driving conditions have remained consistent. Which of the following could be the most likely cause?
7 out of 55
8.
ASE L3: Battery System
During a service inspection on a hybrid vehicle, a technician discovers that the voltage difference between the highest and lowest cell voltages exceeds the manufacturer's specified limit. What does this indicate?
8 out of 55
9.
ASE L3: Battery System
In a hybrid vehicle, what would be an indicator of a deteriorating high-voltage battery aside from reduced capacity?
9 out of 55
10.
ASE L3: Battery System
A technician is evaluating the performance of a hybrid vehicle's battery pack. After a full charge, the capacity test results are significantly lower than the manufacturer's specifications. The most likely cause is:
10 out of 55
11.
ASE L3: Battery System
While analyzing the battery condition of a fully electric vehicle, a technician notices that the state-of-charge SoC fluctuates irregularly under steady-state conditions. What is the most probable reason for this occurrence?
11 out of 55
12.
ASE L3: Battery System
A technician is performing a routine check on a high-voltage battery and observes that the battery's state-of-charge SoC drops significantly when a load is applied, then slowly recovers when the load is removed. This phenomenon is indicative of:
12 out of 55
13.
ASE L3: Battery System
If a hybrid vehicle's high-voltage battery exhibits reduced performance and diagnostic testing reveals no electronic faults, which mechanical component should be inspected first?
13 out of 55
14.
ASE L3: Internal Combustion Engine
On a hybrid vehicle, if a cylinder misfire is detected only during the transition from electric to internal combustion engine operation, what is the MOST likely cause?
14 out of 55
15.
ASE L3: Internal Combustion Engine
When diagnosing an internal combustion engine of a hybrid vehicle that intermittently fails to start, which of the following is the MOST likely cause of the problem?
15 out of 55
16.
ASE L3: Internal Combustion Engine
Which of the following is a potential reason for a decrease in the fuel efficiency of a hybrid vehicle's internal combustion engine that is NOT related to the hybrid drive system?
16 out of 55
17.
ASE L3: Internal Combustion Engine
A hybrid vehicle with an Atkinson-cycle engine is experiencing higher than normal engine temperatures during operation. The least likely cause of this condition would be:
17 out of 55
18.
ASE L3: Internal Combustion Engine
A technician finds oil in the intake manifold of a hybrid vehicle during routine maintenance. What is the most likely cause?
18 out of 55
19.
ASE L3: Internal Combustion Engine
A hybrid vehicle exhibits a rough idle condition only when the internal combustion engine is running. The technician should FIRST check:
19 out of 55
20.
ASE L3: Internal Combustion Engine
During the diagnosis of an internal combustion engine on a hybrid vehicle, a technician notices that the oil pressure light flickers at idle when the engine is warm. The FIRST step in diagnosing this issue should be to:
20 out of 55
21.
ASE L3: Internal Combustion Engine
A customer reports that the internal combustion engine of their hybrid vehicle occasionally stalls when coming to a stop. Which of the following should be investigated FIRST?
21 out of 55
22.
ASE L3: Internal Combustion Engine
If a hybrid vehicle's internal combustion engine shows signs of reduced power and a 'pinging' noise under load, what would be the MOST likely cause?
22 out of 55
23.
ASE L3: Internal Combustion Engine
During an inspection, it is found that the internal combustion engine of a hybrid vehicle is producing a significant amount of blue smoke from the exhaust upon startup. The MOST likely cause is:
23 out of 55
24.
ASE L3: Internal Combustion Engine
During an inspection, it is found that the internal combustion engine of a hybrid vehicle is producing a significant amount of blue smoke from the exhaust upon startup. The MOST likely cause is:
24 out of 55
25.
ASE L3: Drive Systems
What issue can cause a false activation of the traction control system in a hybrid vehicle, leading to unintended changes in drive system behavior?
25 out of 55
26.
ASE L3: Drive Systems
A technician observes that a hybrid vehicle is not entering EV mode at low speeds as designed. What could be the most likely cause?
26 out of 55
27.
ASE L3: Drive Systems
When diagnosing a hybrid vehicle's drive system that exhibits reduced acceleration, which of the following diagnostic steps should be performed first?
27 out of 55
28.
ASE L3: Drive Systems
In a series-parallel hybrid drive system, what could cause the vehicle to operate on the internal combustion engine alone, without electric assistance?
28 out of 55
29.
ASE L3: Drive Systems
What condition could lead to a permanent magnet synchronous motor (PMSM) in a hybrid drive system to produce less torque than expected?
29 out of 55
30.
ASE L3: Drive Systems
A hybrid vehicle with an electronically controlled continuously variable transmission (eCVT) fails to move when the drive mode is selected. The most appropriate initial diagnostic step is to:
30 out of 55
31.
ASE L3: Drive Systems
A technician working on a hybrid vehicle's drive system notices a grinding noise during vehicle acceleration. What is the MOST likely cause of this noise?
31 out of 55
32.
ASE L3: Drive Systems
During a road test, a hybrid vehicle's drive system operates normally under light load but lacks power under heavy acceleration. The most likely cause of this symptom is:
32 out of 55
33.
ASE L3: Power Electronics
What could cause an unexpected voltage drop in the high voltage output of a power electronics module?
33 out of 55
34.
ASE L3: Power Electronics
What condition could lead to an insulated-gate bipolar transistor (IGBT) failure in a hybrid vehicle's inverter assembly?
34 out of 55
35.
ASE L3: Power Electronics
Which of the following conditions would MOST likely cause an inverter to shut down in a hybrid electric vehicle?
35 out of 55
36.
ASE L3: Power Electronics
In a hybrid vehicle's power electronic system, what component's failure would MOST directly affect the conversion of DC to AC power?
36 out of 55
37.
ASE L3: Power Electronics
A hybrid vehicle exhibits a DTC related to the power electronics cooling system. Which of the following components, if faulty, would MOST likely cause this DTC?
37 out of 55
38.
ASE L3: Power Electronics
When diagnosing a fault in the regenerative braking system of a hybrid vehicle, which component should a technician inspect if the regenerative braking is weaker than expected, but no DTCs are present?
38 out of 55
39.
ASE L3: Power Electronics
A technician is diagnosing a problem where the regenerative braking system is not functioning as expected. Which component should be inspected FIRST?
39 out of 55
40.
ASE L3: Power Electronics
When testing a high-voltage inverter, a technician finds that it is not providing the correct voltage to the electric motor. What could be the cause of this issue?
40 out of 55
41.
ASE L3: Power Electronics
During the inspection of a hybrid vehicle, a technician notices that the power electronics module (PEM) is overheating. What is the MOST likely cause?
41 out of 55
42.
ASE L3: Power Electronics
A technician is troubleshooting a hybrid vehicle where the electric motor operates sporadically. Which of the following is the MOST likely cause of this problem?
42 out of 55
43.
ASE L3: Power Electronics
Which of the following diagnostic procedures is essential when diagnosing a fault in the DC/DC converter of a hybrid vehicle?
43 out of 55
44.
ASE L3: Power Electronics
A high voltage (HV) battery's state of charge is lower than expected after a test drive. The technician should FIRST check for issues in which of the following components?
44 out of 55
45.
ASE L3: Power Electronics
What component failure in the power electronics system of a hybrid vehicle is MOST likely to result in reduced acceleration and power delivery to the wheels?
45 out of 55
46.
ASE L3: Power Electronics
What is a common reason for a power inverter module (PIM) to mismanage power distribution in a hybrid vehicle?
46 out of 55
47.
ASE L3: Power Electronics
In a hybrid vehicle, what condition could cause the DC link capacitor in the inverter to fail prematurely?
47 out of 55
48.
ASE L3: Hybrid Supporting Systems
A hybrid vehicle's state of charge SOC for the high-voltage battery remains lower than expected despite normal driving conditions and proper operation of the charging system. What could be a possible cause?
48 out of 55
49.
ASE L3: Hybrid Supporting Systems
What could cause an intermittent loss of power assist from the electric drive motor in a hybrid vehicle?
49 out of 55
50.
ASE L3: Hybrid Supporting Systems
What is a common symptom indicating a malfunction in the hybrid vehicle's power management control system?
50 out of 55
51.
ASE L3: Hybrid Supporting Systems
During the inspection of a hybrid vehicle's power management system, which condition would necessitate further investigation of the DC/DC converter function?
51 out of 55
52.
ASE L3: Hybrid Supporting Systems
What could cause the electric air conditioning compressor in a hybrid vehicle to operate below expected efficiency levels?
52 out of 55
53.
ASE L3: Hybrid Supporting Systems
What is a likely cause of an intermittent high-voltage system shutdown in a hybrid vehicle when there are no diagnostic trouble codes present?
53 out of 55
54.
ASE L3: Hybrid Supporting Systems
When diagnosing an issue with the electric power steering on a hybrid vehicle, which of the following data parameters should be monitored first?
54 out of 55
55.
ASE L3: Hybrid Supporting Systems
When performing a diagnostic procedure on a hybrid vehicle's thermal management system, which of the following would indicate a problem with the system's ability to maintain the battery at optimal operating temperature?
55 out of 55
