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 MANUALSCHEVROLET1994LUMINA V6-204 3.4L DOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSDATA LINK CONNECTORDESCRIPTION AND OPERATION
1994 Chevrolet Lumina V6-204 3.4L DOHC
Data Link Connector: Description and Operation
1994 Chevrolet Lumina V6-204 3.4L DOHCSECTION Description and Operation
CIRCUIT OPERATION
There is one data line that can be accessed with a scan tool. The 461 and 800 circuit data lines are the Powertrain Control Module (PCM) data line. It allows the PCM and Electronic Brake Control Module (EBCM) (if equipped) to communicate by transmitting data through CKT 461 and CKT 800.
A scan tool can be connected to the DLC; this allows the scan tool to communicate with the PCM Data Line. System operations can then be monitored for diagnostic purposes.
There is one data line that can be accessed with a scan tool. The 461 and 800 circuit data lines are the Powertrain Control Module (PCM) data line. It allows the PCM and Electronic Brake Control Module (EBCM) (if equipped) to communicate by transmitting data through CKT 461 and CKT 800.
A scan tool can be connected to the DLC; this allows the scan tool to communicate with the PCM Data Line. System operations can then be monitored for diagnostic purposes.
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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.