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60 Questions  I  By Mike239

  
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1.  Oxides of Nitrogen emissions are controlled by the catalytic converter and the:
A.
B.
C.
D.
2.  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.
3.  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.
4.  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.
5.  All of the following will disable the air conditioner compressor clutch on the composite vehicle EXCEPT:
A.
B.
C.
D.
6.  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.
7.  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.
8.  All of the following statements regarding the composite vehicle's OBD II monitors are true EXCEPT:
A.
B.
C.
D.
9.  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.
10.  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.
11.  All of the following could cause an engine with waste spark ignition to misfire EXCEPT:
A.
B.
C.
D.
12.  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.
13.  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.
14.  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.
15.  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.
16.  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.
17.  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.
18.  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.
19.  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.
20.  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.
21.  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.
22.  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.
23.  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.
24.  All of the following statements regarding the schematic shown above are true EXCEPT:
A.
B.
C.
D.
25.  The composite vehicle is misfiring on cylinder number 4.  All of the following could be the cause EXCEPT:
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.  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.
28.  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.
29.  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.
30.  Once a zirconia oxygen sensor reaches operating temperature, how quickly should it  respond to changes in the air/fuel ratio?
A.
B.
C.
D.
31.  What conclusion can be drawn from the I/M 240 inspection report shown below?
A.
B.
C.
D.
32.  All of the following conditions must be met for the composite vehicle to enter closed loop EXCEPT:
A.
B.
C.
D.
33.  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.
34.  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.
35.  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.
36.  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.
37.  All the following condition could cause an increase in hydrocarbon emissions EXCEPT:
A.
B.
C.
D.
38.  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.
39.  On the composite vehicle the CAN terminating resistors are located
A.
B.
C.
D.
40.  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.
41.  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.
42.  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.
43.  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.
44.  The torque converter clutch on the composite vehicle will not engage.  Technician A says a short to ground at pin 72 of the TCM may be the cause.  Technician B says that a voltage short to pin 64 of the ECM may be the cause.  Who is right?
A.
B.
C.
D.
45.  All of the following statements concerning the composite vehicle's fuel system are false EXCEPT:
A.
B.
C.
D.
46.  A kinked vacuum line to hte fuel pressure regulator could cause:
A.
B.
C.
D.
47.  The default throttle position on the composite vehicle is:
A.
B.
C.
D.
48.  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.
49.  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.
50.  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.
51.  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.
52.  All of the following information is typically entered into the computer prior to performing an I/M test EXCEPT:
A.
B.
C.
D.
53.  The usual number of terminating resistors on a CAN harness is:
A.
B.
C.
D.
54.  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.
55.  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.
56.  What is the most effective way to test the PCV system?
A.
B.
C.
D.
57.  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.
58.  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.
59.  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.
60.  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.
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