ASE L1

60 Questions | By Mike239 | Last updated: Feb 15, 2013 | Total Attempts: 1410

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Questions and Answers

1.

All of the cylinders in a overhead cam engine have low compression. What is the MOST LIKELY cause of this condition?
- A.
  
  Burned valves
- B.
  
  Leaking head gasket
- C.
  
  Worn piston rings
- D.
  
  Broken timing belt
2.

A cylinder leakage test is being performed on an overhead valve v8 engine. When air is applied to the No. 5 cylinder, a hissing noise is heard from the tailpipe. Technician A says that the cam lobe for the No. 5 exaust valve could be worn down. Technician B says that the No 5 exaust valve could be burnt. Who is right?
- A.
  
  Technician A Only
- B.
  
  Technician B Only
- C.
  
  Both A and B
- D.
  
  Neither A or B
3.

A customer complains that their vehicle lacks power. What would be the the first step in determining the cause of the problem?
- A.
  
  Analyze scan data
- B.
  
  Measure fuel pressure
- C.
  
  Road test the vehicle
- D.
  
  Check exaust backpressure
4.

A engine pings excessively under load. All of the following conditions could cause this condition EXCEPT:
- A.
  
  Missing thermostat
- B.
  
  Improper antifreeze concentration
- C.
  
  EGR valve stuck closed
- D.
  
  Missing catalytic converter
5.

A vehicle with multiport fuel injection stalls on deceleration. Technician A says the problem could be the result of a faulty TCC solenoid. Technician B says that a contaminated throttle body may be the cause. Who is right?
- A.
  
  Technician A only
- B.
  
  Technician B only
- C.
  
  Both A and B
- D.
  
  Neither A or B
6.

The ISC motor toggles back and forth at closed throttle on an overhead valve V8 with DI ignition. A permanent magnet sensor inside the distributor is used to generate the rpm signal. Technician A says that a loose timing change may be causing the problem technician B says that the problem may be the result of a worn distributor shaft gear. Who is right?
- A.
  
  Tecnician A
- B.
  
  Technician B
- C.
  
  Both A and B
- D.
  
  Neither A or B
7.

The fuel control system on the composite vehicle remains in open loop at all times. Technician A says that this could be the result of poor connection at ECM terminal 60. Technician B says that a faulty IAT sensor could be the problem. Who is right?
- A.
  
  Tehnican A
- B.
  
  Technican B
- C.
  
  Both A and B
- D.
  
  Neither A or B
8.

Once a zirconia oxygen sensor reaches operating temperature, how quickly should it respond to changes in the air/fuel ratio?
- A.
  
  50 microseconds
- B.
  
  100 milliseconds
- C.
  
  One second
- D.
  
  1000 milliseconds
9.

The composite vehicle will not start. Cranking speed is above 250 rpm. The following PIDs were observed by two technicians under KOEO conditions at closed throttle. ECT 68° F IAT 67° F MAF 0.2V APP 1 0.5V MAP/BARO 101 kPa LOOP OPEN TAC 35% BAT 11.9V APP 2 1.5V RPM 0 HO2S 1/1 0.00 HO2S 2/1 0.00 HO2S ½ 0.00 TP 1 4.50V TP C 0.5V FUEL PUMP OFF Tank LEV 0% TR P/N LOAD 0% Technician A says that the system is stuck in the clear flood mode. Technician B says that a fault MAP sensor may be the cause of the no-start. Who is right?
- A.
  
  Technician A only
- B.
  
  Technician B only
- C.
  
  Both A and B
- D.
  
  Neither A or B
10.

The wave form shown above was captured in closed loop at 1500 rpm from the Bank 1 O2 sensor on the composite vehicle. What can be determined by an analysis of the waveform?
- A.
  
  The engine is running lean
- B.
  
  Sensor switching frequency is too slow
- C.
  
  Sensor response time is below normal
- D.
  
  The sensor is functioning properly
11.

The composite vehicle has an unstable idle, the MIL is on, and DTC P0300 is stored for a Random Misfire. According to the scan data, which of the following could be the root cause of the problem? ECT 198° F IAT 86° F MAF 0.2V APP 1 0.5V MAP/BARO 2.3V LOOP CLOSED TAC 15% BAT 13.2V APP 2 1.5V RPM 513 HO2S 1/1 0.86 HO2S 2/1 0.78 HO2S ½ 0.51 TP 1 4.50V TP 2 0.5V Bank 1 STFT Bank 2 STFT Bank 1 LTFT Bank 2 LTFT -12% -9% -8% -5%
- A.
  
  EGR valve not seating
- B.
  
  Faulty ignition coil
- C.
  
  Clogged injector
- D.
  
  Vacuum lean
12.

All of the following statements regarding the schematic shown above are true EXCEPT:
- A.
  
  The solenoid coil receives battery power at KOEO and KOER
- B.
  
  A blown 20A fuse would result in 0 volts at ECM terminal 23
- C.
  
  The EGR valve is shown in the de-energized state
- D.
  
  The pintle position sensor is shown at approximately the 2.5V position
13.

The composite vehicle won't shift into third gear. Technician A says that an open NO. 2 shift solenoid (SS2) could be the problem. Technician B says tat a poor connection at TCM terminal 75 could cause this condition. Who is right?
- A.
  
  Technician A only
- B.
  
  Technician B only
- C.
  
  Both A and B
- D.
  
  Neither A or B
14.

All of the following statements regarding the composite vehicle's OBD II monitors are true EXCEPT:
- A.
  
  The Comprehensive Component Moniotr is a one-trip test
- B.
  
  The Fuel Control, O2 Sensor and Misfire Monitors are run continuously
- C.
  
  The EVAP Monitor will not run if engine timperature is above 94 degree F (34 degree C)
- D.
  
  A LTFT reading of -30% could cause the Fuel Control Monitor to fail
15.

A DTC P0420 (Low Catalyst Efficiency) is stored in memory on a vehicle with an illuminated MIL. Technician A says that the root cause of the problem may be worn valve guide seals. Technician B says that a leaking Exhaust system may have triggered the DTC. Who is right?
- A.
  
  Technician A only
- B.
  
  Technician B only
- C.
  
  Both A and B
- D.
  
  Neither A or B
16.

Refer to the schematic below to answer the following question: Technician A says that to check the voltage drop across the main relay switch contacts, the voltmeter leads should be connected between terminals B and D with there relay energized. Technician B says that to check the voltage drop in the O2 ground circuit, the voltmeter leads should be connected between PCM terminals B15 and G101. Who is right?
- A.
  
  Technician A only
- B.
  
  Technician B only
- C.
  
  Both A and B
- D.
  
  Neither A or B
17.

The composite vehicle lacks power. The engine has been recently tuned up and results from a power balance test were good. The following snapshot of scan data was captured at 2500 rpm under no-load. Which analysis of this information is correct? ECT 209° F IAT 86° F MAF 0.3V APP 1 0.65V MAP/BARO 3.6V LOOP CLOSED TAC 21% DTC NONE APP 2 1.65V RPM 2500 HO2S 1/1 0.89 HO2S 2/1 0.91 HO2S ½ 0.56 TP 1 4.25V TP 2 0.88V Bank 1 STFT Bank 2 STFT Bank 1 LTFT Bank 2 LTFT -13% -15% -10% -12% Technician A says that the root cause of the problem may be clogged catalytic converter. Technician B says that the problem could be the result of low fuel pressure. Who is right?
- A.
  
  Technician A only
- B.
  
  Technician B only
- C.
  
  Both A and B
- D.
  
  Neither A or B
18.

The following waveform was captured in closed loop at 2000 rpm from the HO2S 1/2 sensor on the composite vehicle. Technician A says that the waveform could be the result of a unintentional ground in the purge flow control circuit (Terminal 37 of the ECM). Technician B says that a clogged PCV valve may be generating this pattern. Who is right?
- A.
  
  Technician A only
- B.
  
  Technician B only
- C.
  
  Both A and B
- D.
  
  Neither A or B
19.

An engine with DI ignition becomes harder to start as outside temperature drops. Below freezing, the engine will not start at all. Technician A says that the problem could be a faulty ignition coil. Technician B says that the coil wire may be bad. Who is right?
- A.
  
  Technician A only
- B.
  
  Technician B only
- C.
  
  Both A and B
- D.
  
  Neither A or B
20.

The engine in the composite vehicle will ot start. A preliminary diagnosis indicates thath there is o spark. Technician A says that a defective CMP sensor could be the root cause of the problem. Technician B says that the ignition module should be replaced. Who is right?
- A.
  
  Technician A only
- B.
  
  Technician B only
- C.
  
  Both A and B
- D.
  
  Neither A or B
21.

Refer to the graphic below to answer the following question: The CKP waveform shown above was taken from the composite vehicle during cranking. Which of the following best describes the waveform?
- A.
  
  The CKP sensor is faulty.
- B.
  
  The reluctor has a chipped tooth
- C.
  
  The CKP sensor is misadjusted
- D.
  
  The patter is normal
22.

All of the following could cause an engine with waste spark ignition to misfire EXCEPT:
- A.
  
  Low prmary circuit resistance
- B.
  
  Faulty generator
- C.
  
  Open plug wire
- D.
  
  Defective ignition control module
23.

The composite vehicle fails a loaded mode I/M test for excessive hydrocarbons. Which of the following is the root cause of the problem?
- A.
  
  Shorted CMP signal wire to the ECM
- B.
  
  Open CKP sensor
- C.
  
  Poor connection at ECM terminal 12
- D.
  
  Blown fuse no. 4
24.

Two technicians are discussing the merits of a snap throttle test for evaluating ignition system performance. Technician A says that this test is more useful for port-injected engines than it is on veheicle with throttle body injection. Technician B says that using a spark tester is more effective way to test the ignition system. Who is right?
- A.
  
  Technician A only
- B.
  
  Technician B only
- C.
  
  Both A and B
- D.
  
  Neither A or B
25.

The ignition coils on the composite vehicle are being tested with and ohmmeter. Which of the following readings is within the specifications for the secondary winding?
- A.
  
  7500Ώ
- B.
  
  11MΏ
- C.
  
  1.5Ώ
- D.
  
  8.25kΏ