Skill Training
1)Inspection of Accelerator Pedal Position Sensor
（1）Table 4.1 Combined with the maintenance manual and circuit diagram,know well about the definition of accelerator pedal position sensor pin,and finish Table 4.1.
Table 4.1 Know Well About the Definition of Accelerator Pedal Position Sensor Pin
（2）Use different methods to finish the single piece inspection of accelerator pedal position sensor and judge whether the following are normal or not and answer the questions.
Press the pedal slowly and use the universal meter to measure the resistance of two groups of potentiometer.
What is the variation law of two groups of resistance?Is it normal?
_______________________________________________________________
Use the universal meter to measure the resistance between pin 3#and 5# and the resistance between pin 2#and 6#respectively.
What are the two measured values respectively?Are they in the normal range?
The resistance between pin 3#and 5#is_____________，□Yes/□No;
The resistance between pin 2#and 6#is___________，□Yes/□No.
（3）Finish the inspection of accelerator pedal position sensor in the car
Use the diagnostic unit to read the default code and do you get it?If yes,what is it?
□Yes/□No______________________________________________________________
Turn on the ignition switch,don’t start and don’t press the accelerator pedal.At this moment,use the diagnostic unit or universal meter to measure the signal voltage of sensor pin 1#and sensor pin 4#respectively.
What are the two measured values respectively?Are they in the normal range?
The signal voltage of sensor pin 1#is____________，□Yes/□No;
The signal voltage of sensor pin 4#is____________，□Yes/□No.
Turn on the ignition switch,don’t start but press the accelerator pedal to the bottom.At this moment,use the diagnostic unit or universal meter to the signal voltage of sensor pin 1#and sensor pin 4#respectively.
What are the two measured values respectively?Are they in the normal range?
The signal voltage of sensor pin 1#is____________，□Yes/□No;
The signal voltage of sensor pin 4#is_____________，□Yes/□No.
2.Inspection of Electronic Throttle Body
（1）Combined with the maintenance manual and circuit diagram,know well about the definition of electronic throttle body pin,and finish Table 4.2.
Table 4.2 Know Well About the Definition of Electronic Throttle Body Pin
（2）Use different methods to finish the single piece inspection of electronic throttle body and judge whether the following are normal or not and answer the questions.
Use the universal meter to inspect the resistance of throttle motor under normal temperature.
What is the measured resistance value?Is it in the normal range?
____________________________________________□Yes/□No;
Open the valve plate of throttle slowly and use the universal meter to measure the resistance of two groups of potentiometer.
What is the variation law of two groups of resistance?Is it normal?
______________________________________________□Yes/□No;
Use the universal meter to measure the resistance between throttle body pin 2# and 5#and the resistance between throttle pin 2# and 6#respectively.
What is the sum of the two resistance values?Is it normal?
____________________________________________□Yes/□No;
（3）Finish the inspection and diagnosis of electronic throttle body and wire connection in the car(https://www.daowen.com)
Use the diagnostic unit to read the default code and do you get it?If yes,what is it?
□Yes/□No_______________________________________________
After starting the car,use the universal meter or diagnostic unit to measure the voltage of throttle pin 5#and 6#respectively.
What are the two measured values respectively?What is the sum of the two measured values?Are they in the normal range?
The voltage of throttle pin 5#is____________，□Yes/□No;
The voltage of throttle pin 6#is____________，□Yes/□No.
The sum of the two is____________________，□Yes/□No.
Use oscilloscope to test the signal wave shape of electronic throttle motor and draw it in Fig.4.12.
Is the signal wave shape normal?□Yes/□No.
Fig.4.12 Signal Wave Shape of Electronic Throttle Motor
Judge whether the performance of electronic throttle body and its wire connection are good or not and if not,you also need to write down the diagnosed fault.
□Yes/□No_____________________________________________
3.Inspection of Intake Pressure Temperature Sensor
（1）Table 4.3 Combined with the maintenance manual and circuit diagram,know well about the definition of intake pressure temperature sensor,and finish Table 4.3.
Table 4.3 Know Well About the Definition of Lntake Pressure Temperature Sensor
（2）Use different methods to finish the single piece inspection of intake pressure temperature sensor and answer the questions.
Use the universal meter to measure the resistance between sensor pin 1#and 2#.
What is the measured value?Is it in the normal range?
__________________________________________□Yes/□No;
（3）Finish the inspection and diagnosis of intake pressure temperature sensor and wire connection in the car
Use the diagnostic unit to read the default code and do you it?If yes,what is it?
□Yes/□No_______________________________________________
Fill the measured values in the blanks and judge whether they are normal or not.
When the vehicle is not started,the intake pressure is________________;Under idling condition,the intake pressure is_______________;When pressing the accelerator pedal hard suddenly in neutral position,the changes of intake pressure are________________;Are the above results normal?□Yes/□No.
Answer the following questions.
Use the universal meter or diagnostic unit to measure the signal voltage of pressure under idling condition.
What is the measured value?Is it in the normal range?
______________________________________________□Yes/□No;
What is the signal voltage of pressure when pressing the accelerator pedal slowly under empty-load condition?Is it in the normal range?
_______________________________________________□Yes/□No;
What are the changes of intake pressure when pressing the accelerator pedal hard suddenly?Are they normal?
______________________________________________□Yes/□No;
After starting the car,under the idling and steady condition,suddenly unplug the wire harness plug of intake pressure temperature sensor.What will happen?
_______________________________________________________________
Judge whether the performance of intake pressure temperature sensor and its wire connection are good or not and if not,you also need to write down the diagnosed fault.
□Yes/□No__________________________________________________