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.
High Speed Controller Area Network (CAN)
The high speed CAN is based on SAE J2284, ISO-11898 and is a serial communication language protocol used to transfer messages (signals) between electronic modules or nodes. Two or more signals can be sent over one CAN circuit allowing two or more electronic modules or nodes to communicate with each other. This communication network operates at 500 kilobytes per second (kb/sec) and allows the electronic modules to share their information messages.
Included in these messages is diagnostic data that is output over the CAN high (+) and CAN low (-) lines to the data link connector (DLC). The diagnostic data such as self-test DTCs or parameter identifiers (PIDs) can be accessed with the scan tool. Information on scan tool equipment is described in DIAGNOSTIC METHODS .
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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.