Unit 2150: Automotive Electrical Systems

1. Introduction to Automotive Electrical Systems

• Overview of automotive electrical systems
• Key components:
  • Battery
  • Alternator
  • Starter motor
  • Wiring harness
  • Fuses and circuit protection
• Functions and interrelation of components

2. Understanding Ohm's Law in Automotive Electrical Systems

• Fundamentals of voltage (V), current (I), and resistance (R)
• Ohm's Law formula: V = I × R
• Application of Ohm's Law in automotive circuits
• Calculating electrical parameters in series and parallel circuits

3. Automotive Batteries and Charging Systems

• Types of automotive batteries:
  • Lead-acid
  • AGM (Absorbent Glass Mat)
  • Gel cell
• Battery construction and operation
• Charging systems:
  • Alternator function and components
  • Voltage regulators
• Battery maintenance and care
• Common battery and charging system issues and their symptoms

4. Electrical Circuit Components in Vehicles

• Relays: purpose, types, and operation
• Switches: various types and their automotive applications
• Sensors: temperature, oxygen, speed, and others
• Actuators: solenoids, motors, and valves
• Integration of components in automotive electrical circuits

5. Troubleshooting Techniques for Automotive Electrical Systems

• Systematic diagnostic approach
• Tools and equipment:
  • Multimeter usage (voltage, current, resistance testing)
  • Circuit testers and scan tools
• Identifying common electrical faults:
  • Open circuits
  • Short circuits
  • Ground faults
• Testing and replacing faulty components

6. Vehicle Lighting Systems

• Types of vehicle lighting:
  • Headlights (halogen, HID, LED)
  • Taillights
  • Turn signals and hazard lights
  • Interior lighting
• Wiring and control circuits for lighting
• Proper alignment and maintenance of lighting systems
• Legal requirements and standards for vehicle lighting

7. Ignition Systems and Engine Control Modules

• Components of ignition systems:
  • Spark plugs
  • Ignition coils
  • Distributor (if applicable)
• Function and operation of ignition systems
• Engine Control Modules (ECM): role and functions
• Interaction between ignition system and ECM

8. Electronic Fuel Injection Systems

• Overview of fuel delivery systems
• Fuel pumps and fuel injectors: operation and control
• Sensors involved in EFI:
  • Throttle position sensor
  • Mass airflow sensor
  • Oxygen sensor
• ECU (Engine Control Unit) role in fuel management
• Benefits of EFI over carburetors

9. Wiring Diagrams and Schematics in Automotive Electrical Systems

• Understanding symbols and notations
• Types of diagrams: wiring diagrams vs schematics
• Reading and interpreting diagrams for troubleshooting
• Tracing circuits and identifying connections

10. Vehicle Safety and Electrical System Regulations

• Electrical safety procedures and precautions
• Personal protective equipment (PPE) in electrical work
• Regulatory standards and compliance (e.g., SAE, ISO)
• Impact of electrical systems on overall vehicle safety and performance
• Environmental considerations and disposal of electrical components