L1 Advanced Engine Performance Tests

ASE L1 Test Preparation

Main Wiring Diagram Links:

Diagram 1 of 3 (large post view)
Diagram 2 of 3 (large post view)
Diagram 3 of 3 (large post view)
Diagram 1 of 3 (quick view)
Diagram 2 of 3 (quick view)
Diagram 3 of 3 (quick view)

Composite Vehicle Reference Images:

Vehicle Engine Diagram #1 (large post view)
Vehicle Engine Diagram #2 (large post view)
Composite Vehicle Engine Diagram #1 (quick view)
Composite Vehicle Engine Diagram #2 (quick view)

Composite Vehicle Reference Content

L1 Advanced Engine Performance Part 3

Progress:

1. On the composite vehicle the CAN terminating resistors are located

2. A kinked vacuum line at the fuel pressure regulator could cause:

3. An engine pings excessively under acceleration. All of the following conditions could cause this EXCEPT:

Fuel Injector Waveform Example 4. Two technicians are discussing the fuel injector waveform shown here. Technician A says that the rise in control circuit voltage is normal. Technician B says that the waveform is typical of a peak and hold injector. Who is correct?

5. All of the following conditions could cause an increase in HC (hydrocarbon) emissions EXCEPT:

6. The downstream oxygen sensor signal is switching consistently with the upstream oxygen sensors. The Malfunction Indicator Light (MIL) is on and the composite vehicle has high emissions.Technician A says the downstream oxygen sensor could be defective. Technician A says a faulty catalytic converter could be the problem. Who is correct?

Emissions Test Example 7. A vehicle with TBI (Throttle Body Injection) failed the ASM5015 test based on the following Vehicle Inspection Report (VIR). Technician A says that the engine may have a leaking throttle body gasket. Technician B says that the gas readings could be the result of a bad catalytic converter. Who is correct?

8. The radiator fan is not turning on causing the composite vehicle to overheat. Turning on the air conditioner won't turn on the fan. Technician A says that an open circuit to pin 6 of the ECM could be the cause. Technician B says a blown fuse number 4 could be the cause. Who is correct?

9. The composite vehicle will not start. Cranking speed is above 250 rpm. The PID's shown above were observed by two technicians under KOEO conditions at closed throttle.Technician A says that a failed MAP sensor may be the cause of the no start. Technician B says that the system is stuck in clear flood mode. Who is correct?

10. When shifted into a drive range the composite vehicle stalls but restarts immediately. Technician A says an open fuse 72 could be the cause. Technician B says the wire to pin 72 of the TCM is shorted to ground. Who is correct?

11. Two technicians are discussing a snap-throttle test for evaluating ignition system performance. Technician A says that using a spark tester is a more efficient way of to test the ignition system. Technician B says that this test is more useful on port fuel injection than it is for throttle body injection. Who is correct?

12. The composite vehicle is running poorly and has a flashing MIL. Technician A says the condition could be due to an open fuse No. 4. Technician B says a broken circuit to ECM terminal 9 could be the cause. Who is correct?

13. A multiport fuel injection vehicle only starts with the throttle held open. The vehicle history indicates that the engine has never been serviced except for an occasional oil change and it has about 80,000 miles on it. The MFI system uses an Idle Air Control Valve to regulate closed throt­tle rpm. Technician A says that the problem may be the result of a clogged fuel filter. Technician B says that the IAC valve may be stuck in the fully extended position. Who is correct?

14. The composite vehicle lacks power. The engine has been recently tuned-up and the results from the power balance test were good. The above snap-shot of scan data was taken at 2500rpm no load. Which analysis of this information is correct? Technician A says that the problem could be the result of low fuel pressure. Technician B says that root cause of the problem may caused by a plugged catalytic converter. Who is correct?

15. Two technicians are discussing the effect air injection has on the CO2 (carbon dioxide) and O2 (oxygen) readings from a properly functioning vehicle. Technician A says that disabling the air injection system will cause an increase in the 02 reading. Technician B says that C02 reaches its highest point with the air injection system enabled. Who is correct?

16. A customer complains that their vehicle lacks power. What should be the first step in determining the cause of the problem?

17. 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 correct?

18. All of the following could cause an engine with an waste spark ignition to misfire EXCEPT:

19. Idle speed is too high on an engine with a speed density fuel injection system. Technician A states that a leaking throttle body gasket may be causing the problem. Technician B says that someone may have replaced the PCV valve with the wrong type. Who is correct?

20. All of the following statements regarding the wiring diagram shown above are true EXCEPT:

21. The default throttle position on the composite vehicle is:

22. 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 correct?

23. The composite vehicle has an inoperable A/C clutch. Technician A says this condition could be due to a refrigerant leak. Technician B says an open circuit to ECM pin 27 could be the problem. Who is correct?

24. There is poor engine performance on the composite vehicle. Technician A says a faulty exhaust cam position solenoid could be the cause. Technician B says a faulty intake cam position solenoid could be the problem. Who is correct?

25. Technician A says the MAF sensor is located on the intake manifold, and informs the ECM of intake manifold pressure. Technician B says the MAF sensor senses air volume in the air tube. It's signal indicates engine load to the ECM. Who is correct?

Click submit and your anwsers and results will be emailed to you, Good Luck!!!

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