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.
CAN BUS Terminal Resistance, Checking: Function
The Engine Control Module -J623- communicates with other CAN-Bus capable control modules.
The control modules are connected by two data bus wires referred to as CAN High and CAN Low. The CAN bus allows the exchange of information (messages) between the connected modules. Messages that are missing data on the CAN bus are recognized as a malfunction by the control module connected to the CAN bus that received the invalid data.
Trouble-free operation of the CAN Bus requires that it have a Terminal Resistance. This central Terminal Resistance is located in the Engine Control Module -J623-.
NO RELATED
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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.