Light vehicle diesel engines 1st edition halderman test bank

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Light Vehicle Diesel Engines (Halderman/Ward) Chapter 6 Diesel Engine Condition Diagnosis 1) A clicking sound could be due to ________.

A) Worn valve bridges (crossheads) B) Excessive clearance in the rod bearings C) A defective alternator bearing D) Loose accessory mounts Answer: A Diff: 1 Page Ref: 72 Chapter Quiz: Yes Objective: 6-4 Discuss engine noise diagnosis.

ASE: A9A Prepare for the Light Vehicle Diesel Engine (A9) ASE certification test content area "A" (General Diagnosis).

2) A diagnostic trouble code (DTC) P0300 means ________.

A) A random misfire has been detected B) A fault with the glow plug circuit has been detected C) A fault with fuel injector has been detected D) That one cylinder has low compression Answer: A Diff: 1 Page Ref: 74 Chapter Quiz: Yes Objective: 6-1 Discuss the importance of checking for diagnostic trouble codes (DTCs) and technical service bulletins (TSBs).

ASE: A9A Prepare for the Light Vehicle Diesel Engine (A9) ASE certification test content area "A" (General Diagnosis).

3) What test can be performed to find the reason why the batteries are discharged after sitting for a while?

A) Charging voltage test B) Parasitic load test C) Starter draw test D) Battery conductance test Answer: B Diff: 1 Page Ref: 78 Chapter Quiz: Yes Objective: 6-9 Discuss engine starting and charging system tests.

ASE: A9A Prepare for the Light Vehicle Diesel Engine (A9) ASE certification test content area "A" (General Diagnosis).

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4) What test equipment is needed to test crankcase pressure?

A) Compression tester B) Cylinder leakage tester C) A gauge that can measure pressure/vacuum in inches of water D) A digital meter (DVOM) Answer: C Diff: 1 Page Ref: 72 Chapter Quiz: Yes Objective: 6-6 Discuss the crankcase pressure test.

ASE: A9A Prepare for the Light Vehicle Diesel Engine (A9) ASE certification test content area "A" (General Diagnosis).

5) A smoothly operating engine depends on ________.

A) High compression on most cylinders B) Equal compression on all cylinders C) Cylinder compression levels above 200 PSI (700 kPa) and within 70 PSI (500kPa) of each other D) Compression levels below 200 PSI (700 kPa) Answer: B Diff: 1 Page Ref: 75 Chapter Quiz: Yes Objective: 6-7 Explain compression testing, and compare wet and dry compression tests.

ASE: A9A Prepare for the Light Vehicle Diesel Engine (A9) ASE certification test content area "A" (General Diagnosis).

6) Which element represents dirt when reading an oil sample report?

A) Sodium B) Silicon C) Calcium D) Magnesium Answer: B Diff: 1 Page Ref: 70 Chapter Quiz: Yes Objective: 6-2 Discuss typical engine-related complaints and diesel engine smoke diagnosis.

ASE: A9A Prepare for the Light Vehicle Diesel Engine (A9) ASE certification test content area "A" (General Diagnosis).

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7) A cylinder contribution test is performed using a ________.

A) Scan tool B) Digital storage oscilloscope C) Compression or cylinder leak tester D) Both a scan tool and a DSO Answer: A Diff: 1 Page Ref: 75 Chapter Quiz: Yes Objective: 6-8 Describe the cylinder power balance test.

ASE: A9A Prepare for the Light Vehicle Diesel Engine (A9) ASE certification test content area "A" (General Diagnosis).

8) A relative compression test uses a DSO to monitor ________ to determine the relative compression of each cylinder in the engine while it is being cranked.

A) Injector pulse-width B) Fuel pressure drop C) Secondary ignition voltage D) Battery current draw of the starter motor Answer: D Diff: 1 Page Ref: 75 Chapter Quiz: Yes Objective: 6-8 Describe the cylinder power balance test.

ASE: A9A Prepare for the Light Vehicle Diesel Engine (A9) ASE certification test content area "A" (General Diagnosis).

9) When should a wet compression test be performed?

A) Before a dry compression test B) After a cylinder fails a dry compression test C) When the engine is cold D) When a defective head gasket is suspected Answer: B Diff: 1 Page Ref: 76 Chapter Quiz: Yes Objective: 6-7 Explain compression testing, and compare wet and dry compression tests.

ASE: A9A Prepare for the Light Vehicle Diesel Engine (A9) ASE certification test content area "A" (General Diagnosis).

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10) Higher-than-normal crankcase pressure is measured. What is a possible problem?

A) Piston or connecting rod faults B) A clogged crankcase breather C) Leaking intercooler faults D) Excessive exhaust system back pressure Answer: B Diff: 1 Page Ref: 72 Chapter Quiz: Yes Objective: 6-6 Discuss the crankcase pressure test.

ASE: A9A Prepare for the Light Vehicle Diesel Engine (A9) ASE certification test content area "A" (General Diagnosis).

11) A vehicle has the MIL turned ON and a DTC is set. What additional information may help the technician find what caused the DTC to set?

A) Technical service bulletins B) Freeze frame data C) Either A or B D) Neither A nor B Answer: C Diff: 1 Page Ref: 69 Chapter Quiz: No Objective: 6-1 Discuss the importance of checking for diagnostic trouble codes (DTCs) and technical service bulletins (TSBs).

ASE: A9A Prepare for the Light Vehicle Diesel Engine (A9) ASE certification test content area "A" (General Diagnosis).

12) Technician A says that the addition of aftermarket accessories could affect engine operation.

Technician B says that low coolant level is not a concern when diagnosing engine performance problems. Which technician is correct?

A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B Answer: A Diff: 2 Page Ref: 69-70 Chapter Quiz: No Objective: 6-3 Discuss the importance of visual checks.

ASE: A9A Prepare for the Light Vehicle Diesel Engine (A9) ASE certification test content area "A" (General Diagnosis).

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13) An engine oil lab test shows high levels of aluminum and tin in the oil sample. Which of these could be the cause?

A) Worn engine bearings B) Hole in the air filter C) Antifreeze in the oil D) Wear in the valve train Answer: A Diff: 1 Page Ref: 70 Chapter Quiz: No Objective: 6-2 Discuss typical engine-related complaints and diesel engine smoke diagnosis.

ASE: A9A Prepare for the Light Vehicle Diesel Engine (A9) ASE certification test content area "A" (General Diagnosis).

14) A noise caused by piston slap is most noticeable when the engine is ________.

A) Decelerating B) At high speed C) Cold D) Warmed up Answer: C Diff: 1 Page Ref: 72 Chapter Quiz: No Objective: 6-4 Discuss engine noise diagnosis.

ASE: A9A Prepare for the Light Vehicle Diesel Engine (A9) ASE certification test content area "A" (General Diagnosis).

15) A vehicle with a diesel engine may also be equipped with two 12 volt batteries. What is the advantage of doing this?

A) Allows the vehicle to run on 24 volts B) Doubles the available amperage for starting C) Balances weight distribution under the hood D) Adds traction in 4WD vehicles Answer: B Diff: 1 Page Ref: 77 Chapter Quiz: No Objective: 6-9 Discuss engine starting and charging system tests.

ASE: A9A Prepare for the Light Vehicle Diesel Engine (A9) ASE certification test content area "A" (General Diagnosis).

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16) What is the normal voltage of a fully charged battery?

A) 12.0 volts B) 12.4 volts C) 12.5 volts D) 12.6 volts Answer: D Diff: 1 Page Ref: 78 Chapter Quiz: No Objective: 6-9 Discuss engine starting and charging system tests.

ASE: A9A Prepare for the Light Vehicle Diesel Engine (A9) ASE certification test content area "A" (General Diagnosis).

17) A charging system that is working properly will show a charging voltage of between ________ volts.

A) 12.6 and 13.0 B) 13.5 and 15 C) 12.5 and 13.0 D) 24 and 32 Answer: B Diff: 1 Page Ref: 80 Chapter Quiz: No Objective: 6-9 Discuss engine starting and charging system tests.

ASE: A9A Prepare for the Light Vehicle Diesel Engine (A9) ASE certification test content area "A" (General Diagnosis).

18) Engine misfires are detected using the PCM and the ________ sensor.

A) Knock B) Fuel pressure C) Turbo lag D) Crankshaft position Answer: D Diff: 1 Page Ref: 74 Chapter Quiz: No Objective: 6-8 Describe the cylinder power balance test.

ASE: A9A Prepare for the Light Vehicle Diesel Engine (A9) ASE certification test content area "A" (General Diagnosis).

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19) An engine has a knocking sound when running. Which of these could be the cause?

A) Rod bearings B) Loose valve bridge C) Alternator bearing D) U-joint Answer: A Diff: 1 Page Ref: 72 Chapter Quiz: No Objective: 6-4 Discuss engine noise diagnosis.

ASE: A9A Prepare for the Light Vehicle Diesel Engine (A9) ASE certification test content area "A" (General Diagnosis).

20) During an oil pressure test the gauge shows 30 PSI at 2500 RPM. Technician A says that this is too low. Technician B says that this oil pressure reading is normal. Which technician is correct?

A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B Answer: B Diff: 2 Page Ref: 74 Chapter Quiz: No Objective: 6-5 Explain oil pressure testing and the purpose of oil pressure warning lamps.

ASE: A9A Prepare for the Light Vehicle Diesel Engine (A9) ASE certification test content area "A" (General Diagnosis).

21) To test the compression on a diesel engine the ________ are removed in order to install the compression tester.

A) Spark plugs B) Pressure plugs C) Glow plugs D) Poppet valves Answer: C Diff: 1 Page Ref: 76 Chapter Quiz: No Objective: 6-7 Explain compression testing, and compare wet and dry compression tests.

ASE: A9D Prepare for the Light Vehicle Diesel Engine (A9) ASE certification test content area "D" (Lubrication and Cooling Systems Diagnosis and Repair).

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22) Which of these tools is used to check engine oil pressure?

A) Pressure gauge B) Cylinder pressure gauge C) Magnehelic pressure gauge D) Any of these can be used Answer: A Diff: 1 Page Ref: 73 Chapter Quiz: No Objective: 6-5 Explain oil pressure testing and the purpose of oil pressure warning lamps.

ASE: A9D Prepare for the Light Vehicle Diesel Engine (A9) ASE certification test content area "D" (Lubrication and Cooling Systems Diagnosis and Repair).

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