Sensors auto.pdf

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Automotive Technology: Principles, Diagnosis, and Service, 3rd Edition
By James D. Halderman
©
© 2009 Pearson Education, Inc.
2008 Pearson Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
Pearson Prentice Hall - Upper Saddle River, NJ 07458
OBJECTIVES:
After studying Chapter 55, the reader should
be able to:
•
•
•
•
Prepare for ASE Engine Performance (A8)
certification test content area “E”
(Computerized Engine Controls Diagnosis and
Repair).
Explain the purpose and function of the ECT
and IAT temperature sensors.
Describe how to test temperature sensors.
Discuss how MAP sensors work.
Continued
2
Automotive Technology: Principles, Diagnosis, and Service, 3rd Edition
By James D. Halderman
©
© 2009 Pearson Education, Inc.
2008 Pearson Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
Pearson Prentice Hall - Upper Saddle River, NJ 07458
OBJECTIVES:
After studying Chapter 55, the reader should
be able to:
•
•
•
•
•
List the methods that can be used to test MAP
sensors.
List how the operation of the MAP sensor
affects vehicle operation.
Discuss MAP sensor rationality tests.
Discuss how MAF sensors work.
List the methods that can be used to test MAF
sensors.
Continued
3
Automotive Technology: Principles, Diagnosis, and Service, 3rd Edition
By James D. Halderman
©
© 2009 Pearson Education, Inc.
2008 Pearson Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
Pearson Prentice Hall - Upper Saddle River, NJ 07458
OBJECTIVES:
After studying Chapter 55, the reader should
be able to:
•
•
•
•
List how the operation of the MAF sensor
affects vehicle operation.
Discuss MAF sensor rationality tests.
Discuss how oxygen sensors (O
2
S) work.
Describe the symptoms of a failed oxygen
sensor.
4
Automotive Technology: Principles, Diagnosis, and Service, 3rd Edition
By James D. Halderman
©
© 2009 Pearson Education, Inc.
2008 Pearson Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
Pearson Prentice Hall - Upper Saddle River, NJ 07458
KEY TERMS:
barometric manifold absolute pressure (BMAP) •
barometric pressure (BARO) sensor • bias voltage
cylinder head temperature (CHT) • closed-loop operation
• cross counts
engine coolant temperature (ECT)
false air • false lean indication • false rich indication • fuel
trim
hot film sensor • hot wire sensor • intake air temperature
(IAT)
Continued
Automotive Technology: Principles, Diagnosis, and Service, 3rd Edition
By James D. Halderman
5
©
© 2009 Pearson Education, Inc.
2008 Pearson Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
Pearson Prentice Hall - Upper Saddle River, NJ 07458

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