Control Area Network (CAN) System
CONTROL SYSTEMCONTROL AREA NETWORK (CAN) SYSTEM OUTLINE
The vehicle communication network utilizes CAN communications. CAN is used for many modules to communicate with each other on a common network. CAN in-vehicle networking is a method for transferring data among distributed electronic modules via a serial data bus.
The vehicle has 2 module communication networks: Medium speed (MS) CAN and High speed (HS) CAN. Both networks are connected to the Data Link Connector (DLC). This makes diagnosis and testing of these systems easier by allowing one scan tool to be able to diagnose and control any module on the networks from one connector.
CAN SYSTEM STRUCTURAL VIEW
CAN System Structural View:
SMART JUNCTION BOX
The Smart Junction Box uses a protective circuit strategy for many outputs. Output loads (current level) are monitored for excessive current (typically short circuits) and are shut down when a fault is detected.
POWERTRAIN CONTROL MODULE
The center of the electronic engine control (EEC) system is a microprocessor called the PCM. The PCM receives input from sensors and other electronic components. Based on information received and programmed into its memory, the PCM generates output signals to control various relays, solenoids, and actuators. The hybrid vehicle uses a 150-pin PCM which has 3 separate electrical harness connectors.
The PCM is located behind the instrument panel (cowl), center to both driver and passenger sides (access from the engine compartment).
CAN SYSTEM WIRING DIAGRAM
CAN System Wiring Diagram:
INSTRUMENT CLUSTER
The instrument cluster is the gateway module, translating HS-CAN to MS-CAN and vice versa. It receives and sends information to other modules over both the high speed CAN and the medium speed CAN that may not necessarily be used for instrument cluster gauge or indicator outputs. This enables network communication between modules that do not communicate using the same network. The instrument cluster is the only module with this ability.