ASE L1
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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
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