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Good Morning!. Automotive Service Technician. Level 3 Multiplexing and Networking Introduction Why is it important for you to learn this skill?

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  1. Good Morning!

  2. Automotive Service Technician Level 3 Multiplexing and Networking Introduction Why is it important for you to learn this skill? The increased use of microprocessors and electronics has led to improvements that help satisfy both the increasing customer demand for advanced electrical options and the manufacture’s need to reduce vehicle weight. These requirements are met, in part, by approaching the entire electrical system as one complete electronic system containing specific multiplexed networks monitored by a central unit. You must be AWARE of networks in vehicles in order to avoid damaging components and the network during service work. Why do we network modules?

  3. Introduction Lawrence Potyondi 604-908-5625 Cellular LawrencePotyondi@Hotmail.com Entered the trades in 1988 2011-1988=23 years experience

  4. Objective • Explain the purpose of networked components. • Explain the operation of a typical data bus system. • Identify possible problems, symptoms and corrective measures. • Automotive Service Technician (Learning Guide) – Multiplexing and Networking • Automotive Electricity and Electronics – Chapter 16 • Advanced Engine Performance Diagnosis – Chapter 2

  5. Pre-Assessment

  6. Presentation • Terminology • Types/Classifications/Protocols • Network Design • Diagnostics and Troubleshooting • CAN (Controller Area Networking)

  7. Terminology Network - An electronic system composed of control modules and wiring that allow electrical signals to be used to send or receive information between modules. Baud Rate – Pg. 29 Advanced Engine Performance Diagnosis Multiplexing – A process of sending multiple signals of information at the same time over a signal wire. Serial Data – Pg. 8 Learning Guide – Multiplexing and Networking Binary - A computer system that uses a series of zeros and ones to represent information. Node – Pg. 217 Automotive Electricity and Electronics Protocol – A set of rules or a standard used between computers or electronic control modules. Protocols include the type of electrical connectors, voltage levels, and frequency of the transmitted messages. Protocols, therefore, include both the hardware and software needed to communicate between modules.

  8. Types/Classifications/Protocols • Pg. 32 to 33 Advanced Engine Performance Diagnosis • Pg. 5 Learning Guide - Multiplexing and Networking • Pg. 221 to 229 Automotive Electricity and Electronics • SAE (Society of Automotive Engineers) • Class A < 10 Kbps (UART, CCD) • Class B 10.4 Kbps to 125 Kbps (GM class 2, PCI) • Class C 125 Kbps to 1 Mbps (Can 2.0) • J1850 (PWM) • ISO (International Standards Organization) • ISO 9141-2 (CAN) • ISO 15765-4 (CAN) • ISO 11898 (CAN C) • ABS (Automotive Service Technician) vs ABS (Plumbing)

  9. Network Design • Pg. 32 to 33 Advanced Engine Performance Diagnosis • Pg. 6 to 7 Learning Guide - Multiplexing and Networking • Pg. 218 to 220 Automotive Electricity and Electronics • Electronic Control Module (Node) to Electronic Control Module (Node) Communication Paths • Simply how it is connected in the vehicle • Star Pg. 33 • Ring Pg. 7 • Hybrid (Star/Ring) Pg. 33 • Bus Pg. 6

  10. Diagnostics and Troubleshooting • How?So what? Now what? • Open? Short to Voltage? Short to Ground? • Technician A and Technician B • Step by Step Process (8 steps) • Parasitic draw (sleep and awake)

  11. CAN • CAN (Controller Area Network) Pg. 226 Automotive Electricity and Electronics Pg. 34 Advanced Engine Performance Diagnosis • CAN C • All 2008 and later vehicles • SAE J2284/ISO 11898 Protocol • 500000 Bps • Bit time 2uS (2 microseconds) • Sample occurs 1.5uS • 2.5 volts idle logic 1 • Can+ (high) 2.6-3.5 volts /logic 0/pin 6 DLC • Can– (low) 1.5-2.4 volts/ logic 0/pin 14 DLC • Difference between CAN+ (high) and CAN- (low) has to be <3.0 volts • Resistance at data link connector (DLC) is 60 ohms pg. 35 Advanced Engine Performance • Sleep 0 volts on both can+ and can- • Gateway (Can C to other networks)

  12. Practice • Practicum (Shop work) • Tools • Scan tool • Multimeter • Oscilloscope • Breakout box • Breakout connectors

  13. Post-Assessment

  14. Summary • Things to think about… • Fibre Optics – MOST (Media Oriented System Transport Bus) • POF (Plastic Optical Fiber) 10 million bps • D2B (Domestic Digital Bus) 5,600,000 bps • LIN (Local Interconnect Network Bus) 19,200 bps – charging systems (alternators) • Wireless (Bluetooth 2.4 GHz radio spectrum) BSIG (Bluetooth Special Interest Group) • Critical Incident Questionaire.

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