Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSTOYOTA2006SEQUOIA 4WD V8-4.7L (2UZ-FE)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSINFORMATION BUSDESCRIPTION AND OPERATIONMULTIPLEX COMMUNICATION SYSTEM
2006 Toyota Sequoia 4WD V8-4.7L (2UZ-FE)
Multiplex Communication System
2006 Toyota Sequoia 4WD V8-4.7L (2UZ-FE)SECTION Multiplex Communication System
SYSTEM DESCRIPTION
1. MULTIPLEX COMMUNICATION SYSTEM BASICS
a. The SEQUOIA multiplex communication system uses serial communication, which converts multiple pieces of information into serial communication data. As a result, they can be transmitted through a single communication wire.
b. Serial communication data consists of bits and frames. A bit is the basic unit that represents the amount of information. A bit is represented by a binary value "0" or "1". A frame is a body of data that is transmitted together. A frame contains a "header" that indicates the beginning of the data and an "end message" that indicates the end of the data.
c. Based on serial communication, various ECUs are connected on a network to exchange various pieces of information. Such a system is called a multiplex communication system.
1. The BEAN (Body Electronics Area Network) uses the ring and bus styles of networks to connect ECUs. This connection style is called a daisy chain. In the daisy chain, communication can be maintained even if there is an area that has an open circuit.
2. DIAGNOSIS SYSTEM
a. If a DTC for an ECU communication stop is indicated, a connector may be disconnected or there may be open circuits on 2 or more communication buses. When there is an open circuit on only 1 communication bus, no DTC will be detected.
b. If 2 communication buses are open at the position shown in the illustration, DTCs for the ECU communication stop between these 2 buses are indicated.
1. MULTIPLEX COMMUNICATION SYSTEM BASICS
a. The SEQUOIA multiplex communication system uses serial communication, which converts multiple pieces of information into serial communication data. As a result, they can be transmitted through a single communication wire.
b. Serial communication data consists of bits and frames. A bit is the basic unit that represents the amount of information. A bit is represented by a binary value "0" or "1". A frame is a body of data that is transmitted together. A frame contains a "header" that indicates the beginning of the data and an "end message" that indicates the end of the data.
c. Based on serial communication, various ECUs are connected on a network to exchange various pieces of information. Such a system is called a multiplex communication system.
1. The BEAN (Body Electronics Area Network) uses the ring and bus styles of networks to connect ECUs. This connection style is called a daisy chain. In the daisy chain, communication can be maintained even if there is an area that has an open circuit.
2. DIAGNOSIS SYSTEM
a. If a DTC for an ECU communication stop is indicated, a connector may be disconnected or there may be open circuits on 2 or more communication buses. When there is an open circuit on only 1 communication bus, no DTC will be detected.
b. If 2 communication buses are open at the position shown in the illustration, DTCs for the ECU communication stop between these 2 buses are indicated.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.