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.
Data Link Communications Description and Operation: Notes
Regulations and agreements among the automobile manufacturers have resulted in the data link connector (DLC). This connector must be used for the scan tool and programming access to all communications systems used for those purposes on the vehicle. The connector must have the following:
- A 16-pin connector configuration to which all scan tools connect
- Scan tool battery power always available at pin 16
- Scan tool ground always available at pin 4
- A clean signal ground always available at pin 5
The rest of the pins are available for serial data communications to the vehicle system.
The serial data circuits are the means by which the microprocessor controlled modules in the vehicle communicate with each other and the scan tool. There are 3 different types of protocols on this vehicle.
- Class 2
- Controller area network (CAN)
- Keyword 2000
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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.