Chapter 04 - Chapter 4 Electrical and Electronic Controls...

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Chapter 4 Electrical and Electronic Controls Upon completion and review of this chapter, the student should be able to: 25
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Classroom Manual Objectives Explain basic electrical terms. Discuss the basic theories of electricity. Explain the value of Ohm’s Law. Explain how laws of magnetism are used to control automatic transmissions. Explain what a computer is and how it works. Describe the basic types of sensors used in electronically controlled transmission systems. Explain the advantages of using electronic controls for transmission shifting. Explain an elementary shift logic chart. Briefly describe what determines the shift characteristics of each selector lever position. Explain why adaptive learning is an important advancement for electronic control systems. Identify the input and output devices in a typical automatic transmission electronic control system and briefly describe the function of each. Shop Manual Objectives Diagnose electronic control systems and determine needed repairs. Conduct a road test to determine if the fault is electrical or hydraulic. Use common electrical test instruments to locate problems. Conduct preliminary checks on EAT systems and determine needed repairs or service. Retrieve trouble codes from common electronically controlled automatic transmissions and determine needed repairs or service. Follow the prescribed diagnostic procedures according to DTC and/ or symptom and determine needed repairs or service. Perform converter clutch system tests and determine needed repairs or service. Inspect, test, and replace electrical/electronic switches. Inspect, test, and replace electrical/electronic sensors. Inspect, test, bypass, and replace electrical/electronic solenoids. Inspect, test, adjust, and/or replace transmission related electrical/electronic components. Overview This chapter in both manuals reviews basic electrical and electronic theory and testing. They also cover the ways to test and check electronic transmission control circuits. Because of the computer controls, it is necessary to understand the operation and the tests that need to be made to diagnose problems in them. These chapters also cover the service that 26 Instructor’s Guide to Accompany Today’s Technician: Automatic Transmissions & Transaxles 3E
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can be made. Explain that most of the transmissions talked about in these chapters are late models. Reading Assignments Classroom Manual, pages 83-113 Shop Manual, pages 127-190 Terms to Know Adaptive learning ALDL Ammeter Amplitude Computer Conductor Current Cycle Default mode Digital signal Diode DLC DMM DSO EEPROM Electricity Electromagnet EPC solenoid Flux lines Glitches Impedance Insulator LED Magnetism Multimeter Multiplexing Ohmmeter Ohm's Law Open OSS Parallel circuit Potentiometers Pressure sensors PWM Reference voltage sensors Resistance RFI Scan tool Semiconductor Serial data Series circuit Shift schedule
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Chapter 04 - Chapter 4 Electrical and Electronic Controls...

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