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ASE L1

60 Questions  I  By Mike239
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1.  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.
2.  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.
3.  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.
4.  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.
5.  On the comp;osite vehiclle all of the folowing are required to engage the Torque Converter Clutch EXCEPT:
A.
B.
C.
D.
6.  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.
7.  The composite vehicle is misfiring on cylinder number 4.  All of the following could be the cause EXCEPT:
A.
B.
C.
D.
8.  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.
9.  All of the following statements regarding the composite vehicle's OBD II monitors are true EXCEPT:
A.
B.
C.
D.
10.  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.
11.  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.
12.  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.
13.  All of the following could cause an engine with waste spark ignition to misfire EXCEPT:
A.
B.
C.
D.
14.  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.
B.
C.
D.
15.  All of the following conditions must be met for the composite vehicle to enter closed loop EXCEPT:
A.
B.
C.
D.
16.  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.
17.  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.
18.  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.
19.  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.
20.  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.
B.
C.
D.
21.  A engine pings excessively under load.  All of the following conditions could cause this condition EXCEPT:
A.
B.
C.
D.
22.  All of the following information is typically entered into the computer prior to performing an I/M test EXCEPT:
A.
B.
C.
D.
23.  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.
24.  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.
25.  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.
26.  On the composite vehicle, the Immobilizer Module will do all of the following EXCEPT:
A.
B.
C.
D.
27.  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.
28.  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.
29.  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.
30.  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.
31.  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.
B.
C.
D.
32.  Two technician are discussing catalytic converters and their effect on emissions and performance.  Technician A says a defective converter will always cause reduced performance.  Technician B says a defective catalytic converter can cause high emissions without reducing performance.  Who is right?
A.
B.
C.
D.
33.  Oxides of Nitrogen begins to form when combustion temperatures exceed:
A.
B.
C.
D.
34.  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.
35.  Oxides of Nitrogen emissions are controlled by the catalytic converter and the:
A.
B.
C.
D.
36.  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.
B.
C.
D.
37.  A customer complains that their vehicle lacks power. What would be the the first step in determining the cause of the problem?
A.
B.
C.
D.
38.  The accelerator is disabled on the composite vehicle.  Technician A says a broken connection at ECM terminal 49 could be the cause.  Technician B says that broken connections at terminals 18 and 19 will create this condition.  Who is right?
A.
B.
C.
D.
39.  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.
40.  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.
41.  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.
B.
C.
D.
42.  The default throttle position on the composite vehicle is:
A.
B.
C.
D.
43.  The Common Area Network (CAN) on a vehicle is disables.  Technician A says an open terminating resistor could be the cause.  Technician B says a shorted CAN harness could be the problem. Who is right?
A.
B.
C.
D.
44.  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.
45.  The usual number of terminating resistors on a CAN harness is:
A.
B.
C.
D.
46.  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.
47.  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.
48.  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.
49.  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.
50.  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.
51.  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.
52.  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.
53.  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.
54.  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.
55.  What is the most effective way to test the PCV system?
A.
B.
C.
D.
56.  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.
57.  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.
58.  The composite vehicle will not shift past second gear. The resistance of both shift solenoids is 24 Ohms.  Technician A says that the shift solenoids are defective,  Technician B says there could be an open circuit to pin 74 of the TCM.  Who is right?
A.
B.
C.
D.
59.  When performing a drive cycle on the composite vehicle, which of the following is required?
A.
B.
C.
D.
60.  On the composite vehicle the CAN terminating resistors are located
A.
B.
C.
D.
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