ASE Study Guide L2 Medium/Heavy Vehicle Electronic Diesel Engine Practice Test – OLD
ASE Study Guide L2 Medium/Heavy Vehicle Electronic Diesel Engine Practice Test – OLD
The Motor Age Training L2 Practice Test – Medium/Heavy Vehicle Electronic Diesel Engine includes 70 practice questions written by our technical editors familiar with the content for this book and the test taking process.The actual ASE certification tests generally include between 40 and 75 scored, multiple-choice questions measuring your knowledge in various content areas. We have added more questions to our practice tests in order to better prepare you for test taking process. The actual ASE test could contain additional questions that are included for statistical research purposes only. Your answers to those questions will not affect your test score, but since you do not know which ones they are, you should answer all questions in the test. The 5-Year Recertification Test will have fewer questions, but will cover the same content areas as those in the official task list.
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Question 1 of 70
1. Question
All of the following can cause blue smoke EXCEPT:
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Question 2 of 70
2. Question
Technician A says that a dirty air filter should be replaced. Technician B says an air cleaner can only be condemned if it has excessive restriction. Who is right?
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Question 3 of 70
3. Question
The first step in diagnosing a performance defect is to:
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Question 4 of 70
4. Question
The two categories of diagnostic codes displayed on most scanners are:
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Question 5 of 70
5. Question
A scanner value is displayed as N/A. This means:
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Question 6 of 70
6. Question
Technician A says that a sensor with an open circuit usually causes a low sensor voltage code. Technician B says a low sensor voltage code is usually caused by an open sensor ground circuit. Who is right?
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Question 7 of 70
7. Question
An engine has low power, no trouble codes and low turbo boost. The MOST LIKELY cause is:
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Question 8 of 70
8. Question
Technician A says that all temperature sensors on a cold engine should have similar values. Technician B says air temperature will always show the coldest value. Who is right?
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Question 9 of 70
9. Question
While accelerating a diesel engine, the pulse width parameter on the scanner displays the letter "S." This indicates:
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Question 10 of 70
10. Question
A diesel engine cranks but won't start. Technician A says a faulty Synchronous Reference Sensor (SRS) could be the cause. Technician B says that SRS activity can be checked using a scanner. Who is right?
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Question 11 of 70
11. Question
Sensors can be switches, signal generators or:
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Question 12 of 70
12. Question
Technician A says that the wire to the ECM in the above diagram is a low voltage connection. Technician B says that pinching the wire to the ECM to a source of ground can check circuit operation. Who is right?
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Question 13 of 70
13. Question
On many electronically controlled diesel engines, the engine will increase in speed completely in response to the:
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Question 14 of 70
14. Question
A diesel engine will not accelerate and has a code for high TPS voltage. Technician A says a broken reference voltage wire to the TPS could be the cause. Technician B says a grounded reference voltage connection could be the cause. Who is right?
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Question 15 of 70
15. Question
Throttle position sensor data is read on the scanner as a measure of voltage, percentage or:
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Question 16 of 70
16. Question
Once a unit injector is replaced, the ECM will have to be programmed with the new:
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Question 17 of 70
17. Question
The composite vehicle has 60-psi fuel pressure at idle. Technician A says a clogged fuel return could be the cause. Technician B says that a faulty fuel pump could be the cause. Who is right?
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Question 18 of 70
18. Question
An adjustment of injector height will adjust the injection:
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Question 19 of 70
19. Question
The composite vehicle cranks but won't start. Code P190 is stored in memory and the scanner measures 0 rpm while cranking the engine. Technician A says that an open condition on PCM Pin 262 could be the cause. Technician B says that a defective sensor condition could be the cause. Who is right?
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Question 20 of 70
20. Question
The speedometer on the composite vehicle is inoperable. Vehicle speed is correctly measured on a scanner. Technician A says a poor connection at pin 755 of the ECM could be the cause. Technician B says that a broken output wire to the speedometer from the ECM could be the cause. Who is right?
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Question 21 of 70
21. Question
The first step in performing a compression test on most modern diesel engines is to:
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Question 22 of 70
22. Question
Several Communication codes are stored in the PCM. Technician A says that an open in one of the terminating resistors could be the cause. Technician B says that one of the data lines could be shorted to ground could be the cause. Who is right?
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Question 23 of 70
23. Question
All of these are modes used by the ECM for regeneration except:
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Question 24 of 70
24. Question
Cylinder number five on the composite vehicle is misfiring. All of the following could be the cause EXCEPT:
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Question 25 of 70
25. Question
All of the following can cause a crank no start condition EXCEPT:
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Question 26 of 70
26. Question
The MIL is on constantly. Tech A says the BCM may not be communicating with the ECM and/or TCM. Tech A says the ICM may not be communicating with the ECM and/or TCM.
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Question 27 of 70
27. Question
The composite vehicle has a CEL and a code for an accelerator position sensor. Technician A says an open in circuit connection at pin 252 could be the cause. Technician B says an open in the idle switch could be the cause. Who is right?
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Question 28 of 70
28. Question
Technician A says that the defect discussed in question 27 will cause an engine to default to idle speed. Technician B says that the defect discussed in question 27 will cause an engine to default to full rated engine speed. Who is right?
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Question 29 of 70
29. Question
After replacement of an Injector or Injectors what is the additional step that needs to be performed for proper operation? Technician A says that the IQA calibration coding must be programmed in the ECM. Technician B says that the system must be bled to get rid of trapped air. Who is right?
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Question 30 of 70
30. Question
The composite vehicle is being checked for a low power complaint. Under a load, Intake Manifold Pressure Sensor measures 1.35 volts. The scanner indicates that turbocharger position commanded and measured is 100%. Technician A says that the wastegate is defective. Technician B says that the turbocharger actuator is defective. Who is right?
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Question 31 of 70
31. Question
Low fuel volume can be caused by a defective fuel pump or:
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Question 32 of 70
32. Question
The controlled emissions gas that is more LIKELY to form in diesel engines than gasoline engines is:
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Question 33 of 70
33. Question
The composite vehicle reads 0 volts on Scan tool Data display for coolant level sensor. Technician A says an open circuit at pin 3 of the coolant level sensor could be the cause. Technician B says an open circuit at pin 357 of the ECM could be the cause. Who is right?
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Question 34 of 70
34. Question
On a diesel engine, a DPF is usually used to control:
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Question 35 of 70
35. Question
Technician A says the electric fuel pump supplies the mechanical pump. Technician B says it primes the fuel system. Who is right?
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Question 36 of 70
36. Question
During an injector cutout test, cylinder number 2 on a diesel engine tests defective. Technician A says to replace the injector on cylinder number 2. Technician B says to first perform a compression test on cylinder number 2. Who is right?
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Question 37 of 70
37. Question
A diesel engine equipped with an EGR system often uses a delta-p sensor to measure pressure on both sides of the:
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Question 38 of 70
38. Question
The intake air restriction indicator on a diesel engine indicates high restriction. Technician A says to reset the indicator and retest restriction. Technician B says to replace the air cleaner. Who is right?
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Question 39 of 70
39. Question
During a cylinder cutout test, one cylinder tests inoperable. All of the following can cause this condition EXCEPT:
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Question 40 of 70
40. Question
The composite vehicle has a SEL and code for low oil pressure. Oil pressure sensor voltage measures 0.5 volts. Technician A says to take a mechanical oil pressure measurement. Technician B says to replace the oil pressure sensor. Who is right?
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Question 41 of 70
41. Question
The composite vehicle has a SEL, and shuts down in spite of pressing the override switch. Technician A says an open circuit at pin 277 of the ECM could be the cause. Technician B says an open circuit at pin 278 of the ECM could be the cause. Who is right?
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Question 42 of 70
42. Question
Technician A says Passive regeneration typically is done at idle. Technician B says Passive regeneration is typically done at high speeds or heavy loads. Who is right?
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Question 43 of 70
43. Question
While scanning a diesel engine, a parameter for vehicle speed is noticed, but the schematic does not show any speed sensor connected to the ECM. The information MOST LIKELY gets to the ECM through:
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Question 44 of 70
44. Question
On a three-wire sensor, the three connections are usually signal, ground and:
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Question 45 of 70
45. Question
On the composite vehicle, the scanner communicates with the ECM through which serial link?
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Question 46 of 70
46. Question
The three levels of engine protection allowed on the composite vehicle are warning, shutdown and:
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Question 47 of 70
47. Question
The composite vehicle has a CEL and numerous codes for sensors. Technician A says an open circuit at pin 352 could be the cause. Technician B says an open in splice S302 could be the cause. Who is right?
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Question 48 of 70
48. Question
The voltage at PCM pin 251 is 1.0 volts with the throttle released on the composite vehicle. Technician A says the accelerator position sensor is defective. Technician B says that the idle switch is defective. Who is right?
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Question 49 of 70
49. Question
The PTO on the composite vehicle can't change engine speeds. Technician A says an open circuit at PCM Pin 870 could be the cause. Technician B says that a defective Cruise Control Set/Resume switch could be the cause. Who is right?
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Question 50 of 70
50. Question
Which of the following will cause a white smoke condition on a diesel engine?
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Question 51 of 70
51. Question
Which of the following emissions is controlled by the EGR system?
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Question 52 of 70
52. Question
All of the following will cause high HC emissions EXCEPT:
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Question 53 of 70
53. Question
On a diesel engine with Clean Gas Induction (CGI), the exhaust sample is drawn from the:
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Question 54 of 70
54. Question
The process by which engine heat burns off the soot in the Diesel Particulate Filter (DPF) is called:
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Question 55 of 70
55. Question
The engine in the composite vehicle is not developing power on cylinders 5 and 6. Replacing the injectors has not corrected the problem. Technician A says an open at pin 222 of the ECM could be the cause. Technician B says that compression should be checked to make sure the head gasket has not failed. Who is right?
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Question 56 of 70
56. Question
The composite vehicle will not start. When the ignition is turned on, the Check Engine Light (CEL) and Stop Engine Light (SEL) are not illuminated. Technician A says an open fuse number 14 could be the cause. Technician B says a defective ECM Power Relay could be the cause. Who is right?
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Question 57 of 70
57. Question
Spillback is being measured on a common rail injection system and the following values are measured when each injector is individually blocked off:
Technician A says cylinder number 4 could have a bad injector. Technician B says that cylinder number 4 could have a damaged fuel connector. Who is right?
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Question 58 of 70
58. Question
Once a vehicle defect is verified, which of the following should be done next?
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Question 59 of 70
59. Question
The composite vehicle has an illuminated Stop Engine Light (SEL) and a coolant level sensor code. Coolant level has been checked, and pins 1 and 2 at the sensor both measure 5.0 volts. Technician A says an open to the ECM in splice S307 could be the cause. Technician B says an open to the ECM in splice S308 could be the cause. Who is right?
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Question 60 of 70
60. Question
Two technicians are discussing Diesel Particulate Filters (DPF). Technician A says that a small amount of soot on the outlet of the DPF is to be expected. Technician B says that a small number of burned out cells on the DPF are acceptable. Who is right?
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Question 61 of 70
61. Question
The engine has white smoke on startup and is hard to start. Technician A say that Fuse 65 could be open. Technician B say the circuit at G604 could have high resistance. Who is correct?
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Question 62 of 70
62. Question
Diesel emission fluid is a solution of ionized water and:
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Question 63 of 70
63. Question
The Soot Load is at Level 3 the MIL is on and the DPF status light is flashing. Technician A says an Active Regeneration must be done. Technician B says a Parked Regeneration must be done. Who is correct?
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Question 64 of 70
64. Question
To burn the soot during a regeneration. Technician A says Fuel can be injected ahead of the DOC. Technician B says the Intake Heater system is also turned on to increase the air temperature. Who is correct?
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Question 65 of 70
65. Question
Technician A says the minimum fuel rail pressure to start the engine is 4500 psi. Technician B says the maximum fuel rail pressure is 35,000 psi. Who is correct?
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Question 66 of 70
66. Question
The Idle Shutdown timer is disabled. Technician A says the Coolant Temperature sensor may be reading less than 140°F (4°C). Technician B say a vehicle speed sensor code may be stored. Who is correct?
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Question 67 of 70
67. Question
The transmission is stuck in the current gear. Technician A says the power to the Transmission could have been lost. Technician B says the communication with the J1939 network to the Transmission could have been lost. Who is correct?
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Question 68 of 70
68. Question
The transmission range section is operated by clean supplied by the Transmission mounted regulator. Technician A says the air is supplied by an engine mounted air pump. Technician B says the air is supplied by the secondary tank. Who is correct?
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Question 69 of 70
69. Question
The engine is at a derate of 80%. Technician A says that will happen when the Soot Level is at Level 3. Technician B says that can happen if the DEF fluid is 2% +/- from the 32.5 urea concentration in the tank. Who is correct?
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Question 70 of 70
70. Question
The Private Buss Network communicates how to the scan tool. Technician A says it communicates thru the 9-pin Data link connector. Technician B says it communicates thru the 3-pin connector. Who is correct?
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