Skill Training
1)Inspection of Oxygen Sensor
（1）Combined with the maintenance manual and circuit diagram,know well about the definition of oxygen sensor pin,and finish Table 4.4.
Table 4.4 Know Well About the Definition of Oxygen Sensor Pin
（2）Use different methods to finish the single piece inspection of oxygen sensor and answer the questions.
Measure the heating resistance of oxygen sensor under normal temperature.
What is the measured value?Is it normal?
______________________________________________,□Yes/□No;
Simulation Method,use fire to heat the head of oxygen sensor(head is covered in the flame)and use the universal meter to check the voltage between the sensor signal wire and grounding wire.
What is the measured value?Is it normal?
_____________________________________________,□Yes/□No;
（3）Finish the inspection of oxygen sensor in the car and answer the questions.
Use the diagnostic unit to get the malfunction code and do you get it?If yes,what is it?
□Yes/□No_____________________________________________________
Use the universal meter or diagnostic unit to measure the signal voltage of front oxygen sensor under idling condition and the signal voltage of rear oxygen sensor respectively.
What are the signal voltages of the two?Are they normal?
The signal voltage value of front oxygen sensor under idling condition is___________,□Yes/□No;
The signal voltage of rear oxygen sensor is_________,□Yes/□No;
What is the variation law of signal voltage of front oxygen sensor when increasing the rotation speed?Is it normal?(https://www.daowen.com)
________________________________□Yes/□No;
Use oscilloscope to test the signal wave shape of oxygen sensor under idling condition.and draw it in Fig.4.20.
Is the signal wave shape normal?□Yes/□No.
Fig.4.20 Signal Wave Shape of Oxygen Sensor
What is the result of test lamp measuring the heating signal of sensor under idling condition?Is it normal?
____________________________________□Yes/□No;
Judge whether the performance of oxygen sensor and its wire connection are good or not and if not,you also need to write down the diagnosed fault.
□Yes/□No____________________________________________
2.Inspection of Carbon Canister Purge Solenoid
Answer the following questions,judge whether they are normal or not and mark them.
Use the universal meter to measure the resistance of carbon canister purge solenoid coil under normal temperature.
What is the measured value?Is it normal?
______________________________________________,□Yes/□No;
Use the diagnostic unit to finish the action test of carbon canister purge solenoid and what happens after adjusting the scour rate of carbon canister purge solenoid?Is it normal?
_____________________________________________,□Yes/□No;
Use the universal meter to check the voltage of purge solenoid power line.
What is the measured value?Is it normal?
_____________________________________________,□Yes/□No;