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- 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
- 26.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.
Faulty regulator
- B.
Restricted fuel return line
- C.
Defective pump
- D.
Leaking injector
- 27.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.
Lack of power
- B.
High CO emissions
- C.
Rough idle
- D.
Hard start
- 28.A kinked vacuum line to hte fuel pressure regulator could cause:
- A.
Long engine crank times
- B.
Poor fuel economy
- C.
High NOx emisions
- D.
An off-idle hesitation
- 29.All of the following statements concerning the composite vehicle's fuel system are false EXCEPT:
- A.
The system is a contiuous return design
- B.
Fuel pressure ranges between 45 at idle to 50 at wide-open throttle
- C.
Pressure should be at least 45 psi immediately following engine shutdown
- D.
The injectors are "bank fired"
- 30.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.
Technician A only
- B.
Technician B only
- C.
Both A and B
- D.
Neither A or B
- 31.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.
Technician A only
- B.
Technician B only
- C.
Both A and B
- D.
Neither A or B
- 32.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.
Technician A only
- B.
Technician B only
- C.
Both A and B
- D.
Neither A or B
- 33.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.
Technician A only
- B.
Technician B only
- C.
Both A and B
- D.
Neither A or B
- 34.All the following condition could cause an increase in hydrocarbon emissions EXCEPT:
- A.
Missing air pump drive belt
- B.
EGR valbe Stuck closed
- C.
EVAP system leak
- D.
EGR valve not seating
- 35.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.
Blown fuse No. 4
- B.
Gas cap is too tight
- C.
Canister vent solenoid resistance is 49 ohms
- D.
Poor connection at ECM terminal 36
- 36.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.
Technician A only
- B.
Technician B only
- C.
Both A and B
- D.
Neither A or B
- 37.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.
Poor cold driveability
- B.
Spark knock
- C.
Lack power
- D.
Excessive NOx emissions
- 38.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.
Technician A only
- B.
Technician B only
- C.
Both A and B
- D.
Neither A or B
- 39.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.
Technician A only
- B.
Technician B only
- C.
Both A and B
- D.
Neither A or B
- 40.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.
The converter was damaged as a result of the CO failure
- B.
The tecnician damaged the EGR vacuum line while making the initial repair
- C.
The CO failure masked the NOx problem
- D.
The failed retest was coincidental
- 41.What is the most effective way to test the PCV system?
- A.
Shake th valve to see if it rattles
- B.
Perform a vacuum draw test
- C.
Perform an rpm drop test
- D.
Measure the vacuum signal at the valve
- 42.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.
Technician A only
- B.
Technician B only
- C.
Both A and B
- D.
Neither A or B
- 43.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.
Clogged PCV valve
- B.
Faulty pressure regulator
- C.
Restricted fuel return line
- D.
Egr valve not seating
- 44.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.
Technician A only
- B.
Technician B only
- C.
Both A and B
- D.
Neither A or B
- 45.All of the following information is typically entered into the computer prior to performing an I/M test EXCEPT:
- A.
GCWR
- B.
Emissions equipment (based on underhood emissions label)
- C.
VIN
- D.
Engine size
- 46.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.
Technician A only
- B.
Technician B only
- C.
Both A and B
- D.
Neither A or B
- 47.A vehicle with throttle body injection failed the ASMK5015 test based on the following Vehicle Inspection Report (VIR).
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?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% - A.
Technician A only
- B.
Technician B only
- C.
Both A and B
- D.
Neither A or B
- 48.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.
Technician A only
- B.
Technician B only
- C.
Both A and B
- D.
Neither A or B
- 49.The composite vehicle failed an I/M 240 test for excessive NOx. Which of the following conditions could be causing the problem?
- A.
Weak EGR diagphragm spring
- B.
Stuck open thermostat
- C.
Clogged EGR supply tube
- D.
Leaking injector
- 50.What conclusion can be drawn from the I/M 240 inspection report shown below?
- A.
The vehicle passed
- B.
The vehicle failed for high HC
- C.
The vehicle failed for high NOx
- D.
The vehicle failed for high HC and CO
- 51.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.
Technician A onlyt
- B.
Technician B only
- C.
Both A and B
- D.
Neither A or B
- 52.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.
Technician A only
- B.
Technician B only
- C.
Both A and B
- D.
Neither A or B
- 53.The default throttle position on the composite vehicle is:
- A.
0%
- B.
15%
- C.
20%
- D.
30%
- 54.On the composite vehicle, the Immobilizer Module will do all of the following EXCEPT:
- A.
Stop operation of the starter motor
- B.
Verify the key code
- C.
Disable injectors if the keycode is invaled
- D.
Recognize the ECM ID number
- 55.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.
Technician A only
- B.
Technician B only
- C.
Both A and B
- D.
Neither A or B
- 56.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.
Technician A only
- B.
Technician B only
- C.
Both A and B
- D.
Neither A or B
- 57.All of the following will disable the air conditioner compressor clutch on the composite vehicle EXCEPT:
- A.
A shorted A/C request switch
- B.
An open circuit at pin B of the A/C pressure sensor
- C.
An open circuit at pin A of the A/C pressure sensor
- D.
An open circuit at pin 5 of the ECM
- 58.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.
Technician A only
- B.
Technician B only
- C.
Both A and B
- D.
Neither A or B
- 59.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.
Technician A only
- B.
Technician B only
- C.
Both A and B
- D.
Niether A or B
- 60.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.
Technician A only
- B.
Technician B only
- C.
Both A and B
- D.
Neither A or B
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