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Ase L1

60 Questions  I  By Mike239
ASE L1

  
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1.  The composite vehicle fails on I/M 240 test due to high carbon monoxide emissions.  HC is barely within limits, while NOx is well below the maximum cutpoint.  Once the cause of the high CO has been corrected, the vechile is retested and fails again, only this time for excessive NOx.  What is the MOST likely reason for the subsequent failure?
A.
B.
C.
D.
2.  Two technicians are discussing the injector waveform shown above.  Technician A says that the waveform is typical of a peak and hold injector.  Technician B says that the rise in control circuit voltage is normal.  Who is right?
A.
B.
C.
D.
3.  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.
B.
C.
D.
4.  The composite vehicle is running poorly.  The technician has recorded the following data: Engine Idle Speed               700 RPM Mass Air Flow sensor          0.7 volts MAP sensor                           2.1 volts Technician A says a faulty MAO sensor is the cause.  Technician B says the Mass Air Flow sensor is defective.  Who is right?
A.
B.
C.
D.
5.  The composite vehicle has high mileage and a low power complaint.  The MAP sensor reads 1.76 volts at idle and at a steady 2000 rpm.  Technician A says a compression test should be done to check engine condition.  Technician B says the engine should be checked for a vacuum leak.  Who is right?
A.
B.
C.
D.
6.  Fuel pressure on a continuous return injection system is within specifications, but leaks down to zero immediately after the pump stops running.  What is the most likely cause of this condition?
A.
B.
C.
D.
7.  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.
B.
C.
D.
8.  Technician A says that ohmmeter testing will be required to diagnose the composite vehicle in the previous question.  Technician B says a scanner may provide adequate diagnostic capability in this case.  Who is right?
A.
B.
C.
D.
9.  The CAN harness resistance on the composite vehicle is measured at 120 Ohms.  Technician A says that a terminating resistor is open.  Technician B says this is a normal resistance value.  Who is right?
A.
B.
C.
D.
10.  The composite vehicle has no fuel pressure.  Technician A says that the problem could be the result of a blown No. 3 fuse.  Technician B says that the problem could be a poor connection at ECM terminal 5.  Who is right?
A.
B.
C.
D.
11.  The composite vehicle is misfiring on cylinder number 4.  All of the following could be the cause EXCEPT:
A.
B.
C.
D.
12.  All of the cylinders in a overhead cam engine have low compression.  What is the MOST LIKELY cause of this condition?
A.
B.
C.
D.
13.  All of the following statements regarding the schematic shown above are true EXCEPT:
A.
B.
C.
D.
14.  A vehicle with throttle body injection failed the ASMK5015 test based on the following Vehicle Inspection Report (VIR). Mode   CO%     HC ppm   Loaded Limit Reading Result Limit Reading Result ASN5015 0.44 1.32 FAIL 7.8 23.6 FAIL                  NOx PPM   RPM Dilution     Limit  Reading Result Reading Reading     62.5 37.9 PASS 152.8 12.10%     Technician A says that the gas readings could be the result of a bad catalytic converter.  Technician B says that the engine may have a leaking throttle body gasket.  Who is right?
A.
B.
C.
D.
15.  The composite vehicle uses two Throttle Position Sensors.  Technician A says this is a failsafe in case one sensor fails.  Technician B says that the use of two sensors allows for a more accurate measurement of throttle position.  Who is right?
A.
B.
C.
D.
16.  The composite vehicle is overheating.  The radiator fan is not turning on and turning on the air conditioner won't turn on the fan.  Technician A says a blown fuse number 4 could be the cause.  Technician B says that an open circuit to pin 6 of the ECM could be the cause.  Who is right?
A.
B.
C.
D.
17.  All the following condition could cause an increase in hydrocarbon emissions EXCEPT:
A.
B.
C.
D.
18.  The default throttle position on the composite vehicle is:
A.
B.
C.
D.
19.  All of the following statements regarding the composite vehicle's OBD II monitors are true EXCEPT:
A.
B.
C.
D.
20.  When performing a drive cycle on the composite vehicle, which of the following is required?
A.
B.
C.
D.
21.  On the comp;osite vehiclle all of the folowing are required to engage the Torque Converter Clutch EXCEPT:
A.
B.
C.
D.
22.  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.
B.
C.
D.
23.  On the composite vehicle the CAN terminating resistors are located
A.
B.
C.
D.
24.  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.
B.
C.
D.
25.  A vehicle with multi-port fuel injection only starts with the throttle held open.  A review of the vehicle history indicates that all though the vehicle has 75,000 miles, on it, the engine has never been serviced except for an occasional oil change.  The MFI system uses an idle Air Control Valve to regulate closed throttle rpm.  Technician A says that IAC valve may be stuck in the fully extended position.  Technician B says that the problem may be the result of a clogged fuel filter.  Who is right?
A.
B.
C.
D.
26.  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.
B.
C.
D.
27.  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.
B.
C.
D.
28.  Two technicians are discussing emission controls and related failure symptoms.  Technician A says that if the hot air hose is missing on an engine with a thermostatic air cleaner.  NOx emissions will be higher than normal.  Technician B says that a faulty secondary air system can cause backfiring.  Who is right?
A.
B.
C.
D.
29.  A Vehicle fails an I/M 240 test for excessive NOx emissions.  Technician A says that a restricted air filter may be causing the  problem.  Technician B says that the engine may have excessive intake valve deposits.  Who is right?
A.
B.
C.
D.
30.  The composite vehicle is running poorly and has a flashing MIL.  Technician A says a broken circuit to ECM pin 9 could be the cause.  Technician B says the condition could be due to and open fuse number 4.  Who is right?
A.
B.
C.
D.
31.  What conclusion can be drawn from the I/M 240 inspection report shown below?
A.
B.
C.
D.
32.  The composite vehicle stalls when shifted into a drive range, but restarts immediately.  Technician A says the wire to pin 72 of the TCM is shorted to ground.  Technician B says an open fuse 72 could be the cause.  Who is right?
A.
B.
C.
D.
33.  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.
B.
C.
D.
34.  Oxides of Nitrogen emissions are controlled by the catalytic converter and the:
A.
B.
C.
D.
35.  The composite vehicle failed an I/M 240 test for excessive NOx.  Which of the following conditions could be causing the problem?
A.
B.
C.
D.
36.  Idle speed is too high on an engine with a speed density fuel injection system.  Technician A says that someone may have replaced the PCV valve with the wrong type.  Technician B says that a leaking throttle body gasket may be causing the problem.  Who is right?
A.
B.
C.
D.
37.  The composite vehicle stalls at idle but restarts.  Technician A says an open circuit to ECM pin 35 could be the cause.  Technician B says an open circuit at pin A of the EGR solenoid could be the problem.  Who is right?
A.
B.
C.
D.
38.  The composite vehicle has high emissions and an illuminated Malfunction Indicator Light (MIL).  The downstream oxygen sensor voltage is varying consistent with the upstream oxygen sensors.  Technician A says a faulty catalytic converter could be the problem.  Technician B says the downstream oxygen sensor could be defective.  Who is right?
A.
B.
C.
D.
39.  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.
B.
C.
D.
40.  Once a zirconia oxygen sensor reaches operating temperature, how quickly should it  respond to changes in the air/fuel ratio?
A.
B.
C.
D.
41.  The composite vehicle stalls as it comes to a stop.  A road test reveals that the torque converter clutch is not releasing.  Technician A says a broken connection at EC< terminal 64 could be the cause.  Technician B says the problem could be caused by a broken connection at TCM terminal 78.  Who is right?
A.
B.
C.
D.
42.  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.
B.
C.
D.
43.  The usual number of terminating resistors on a CAN harness is:
A.
B.
C.
D.
44.  The composite vehicle loses fuel pressure immediately on shutdown.  Technician A says the pressure regulator on the fuel rail may be defective.  Technician B says the fuel tank will have to be removed to repair this problem.  Who is right?
A.
B.
C.
D.
45.  All of the following will disable the air conditioner compressor clutch on the composite vehicle EXCEPT:
A.
B.
C.
D.
46.  The EFE heater stays energized all the time on an engine with TBI.  Which of the following symptoms would not be associated with this condition?
A.
B.
C.
D.
47.  A vehicle with continuous return injection fails the low-speed portion of a two-speed idle test.  According to the test results, which of the following conditions caused the vehicle to fail? Idle Test Results                                       Measured                     Limit HC (ppm)                    855                              220 CO (%)                        0.14                             1.2 CO2 (%)                      7.98 O2 (%)                         4.85                 Engine RPM               648     
A.
B.
C.
D.
48.  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.
B.
C.
D.
49.  A TSI test is automatically aborted after 10 seconds in the high speed mode.  Refer to the test results to determine the validity of the technicians statements.                                         2500 RPM Test Results                                       Measured                     Limit HC (ppm)                    4                                  220 CO (%)                        0.00                             1.2 CO2 (%)                      0.00 O2 (%)                       20.85               Engine RPM              2558    Technician A says that thee exhaust system may be leaking.  Technician B says that the engine could be running too lean.  Who is right?
A.
B.
C.
D.
50.  The composite vheicle has poor performance.  Technician A says a faulty intake cam position solenoid could be the problem.  Technician B says a faulty exhaust cam position solenoid could be the cause.  Who is right?
A.
B.
C.
D.
51.  The composite vehicle fails a two-speed idle test due to excessive carbon monoxide.  When the PCV valve is removed from the valve cover, CO emissions drop below the maximum allowable limit.  Technician A says that this test proves the PCV system is working properly.  Technician B says that the engine may have one or more leaking injectors.  Who is right?
A.
B.
C.
D.
52.  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.
B.
C.
D.
53.  The A/C clutch is inoperable on the composite vehicle.  Technician A says an open circuit to ECM pin 27 could be the problem.  Technician B says this condition could be due to a refrigerant leak.  Who is right?
A.
B.
C.
D.
54.  The readings shown below were recorded during an injector balance test.  All of the following symptoms are consistent with the test results EXCEPT: Injector  1 2 3 4 5 6   Initial Pressure 55 55 55 55 55 55   Final Pressure 32 46 33 49 31 34   Pressure Drop 23 9 22 6 24 21 spec (psi) 21-24
A.
B.
C.
D.
55.  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.
B.
C.
D.
56.  The composite vehicle has and illuminated MIL and a stored DTC for and EVAP system failure.  Which of the following could be the cause?
A.
B.
C.
D.
57.  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.
B.
C.
D.
58.  Two technicians are discussing the effect air injection has on the carbon dioxide and oxygen readings from a properly functioning vehicle.  Technician A says that CO2 reaches is highest point with the air injection system enabled.  Technician B says that disabling the air injection system will cause an increase in the O2 reading.  Who is right?
A.
B.
C.
D.
59.  the composite vehicle idles rough and stalls when the transmission is put into gear.  Technician A says that the throttle body may be contaminated.  Technician B says that the circuit to ECM terminal 35 could be shorted to ground.  Who is right?
A.
B.
C.
D.
60.  Technician A says that an engine misfire will result in low CO along with high O2 readings.  Technician B says that low CO and high O2 readings could be the sign of a lean mixture.  Who is right?
A.
B.
C.
D.
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