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 MANUALSSUBARU2007FORESTER F4-2.5L DOHC TURBOREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSINFORMATION BUSDESCRIPTION AND OPERATIONLAN CONFIGURATIONLAN CONNECTED UNITS
2007 Subaru Forester F4-2.5L DOHC Turbo
LAN Connected Units
2007 Subaru Forester F4-2.5L DOHC TurboSECTION LAN Connected Units
LAN CONNECTED UNITS
UNITS CONNECTED VIA HIGH SPEED LAN
NOTE:
- Terminal resistors built into the ECM and VDCCM &H/U stabilize traffic on the bus, and enables signals distinction from the voltage difference between the two bus lines (CAN_High and CAN_Low). These bus lines are called the main lines. Other units are connected in parallel to the main lines. These wires are called branch lines.
- If one bus line of the main lines becomes open, this is detected as an error and communication becomes no longer possible.
- If one bus line of a pair of branch lines becomes open, communication with the unit connected to the branch line becomes no longer possible, however, communication with other units remain intact. (The error will be displayed.)
UNITS CONNECTED VIA LOW SPEED LAN
NOTE:
- In low-speed CAN, the system still allows communication even if one of the twisted-pair cable wires becomes open. (Errors will be detected.)
- The high-speed and low-speed LANs described, and the IE_Bus, dedicated communication lines, and select monitor communication, etc. comprise the vehicle's data communication system.
Units Connected Via High-Speed Lan:
UNITS CONNECTED VIA HIGH SPEED LAN
NOTE:
- Terminal resistors built into the ECM and VDCCM &H/U stabilize traffic on the bus, and enables signals distinction from the voltage difference between the two bus lines (CAN_High and CAN_Low). These bus lines are called the main lines. Other units are connected in parallel to the main lines. These wires are called branch lines.
- If one bus line of the main lines becomes open, this is detected as an error and communication becomes no longer possible.
- If one bus line of a pair of branch lines becomes open, communication with the unit connected to the branch line becomes no longer possible, however, communication with other units remain intact. (The error will be displayed.)
Units Connected Via Low-Speed LAN:
UNITS CONNECTED VIA LOW SPEED LAN
NOTE:
- In low-speed CAN, the system still allows communication even if one of the twisted-pair cable wires becomes open. (Errors will be detected.)
- The high-speed and low-speed LANs described, and the IE_Bus, dedicated communication lines, and select monitor communication, etc. comprise the vehicle's data communication system.
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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.