Data Link Connector: Description and Operation

Fig. 2 Data Link (Diagnostic) Connector:

DATA LINK CIRCUITS
The Powertrain Control Module (PCM) communicates with the DRB Scan Tool through the data link receive and transmit circuits. Technicians can connect the DRB Scan Tool to the data link connector. The data link connector contains 16 terminals. Terminal 6 is the Data Link Engine Receive circuit. Terminal 7 is the Data Link Engine Transmit (K-Line) circuit.

DATA LINK CONNECTOR
The data link connector (diagnostic connector) links the DRB scan tool with the Powertrain Control Module (PCM). Refer to On-Board Diagnostics in Emission Control Systems. The data link connector is located inside the vehicle, under the instrument panel, at the driver's kick panel Fig. 2.

CIRCUIT OPERATION
Circuit M1 supplies battery voltage to the data link connector. This circuit is protected by a 10 amp fuse located in cavity 5 of the junction block. Circuit M1 is the Ignition-Off Draw circuit and supplies power to the Body Control Module (BCM), radio memory, interior lamps and the power antenna.

A twisted pair of wires, circuits D1 and D2, connect to the data link connector. These wires are connected to the CCD Bus. The CCD Bus is used for diagnosing vehicle components and modules.

Circuits D20 and D21 from the Powertrain Control Module (PCM) connect to the data link connector. Circuit D20 connects to cavity 75 of the PCM and is the SCI receive circuit. Circuit D21 connects to cavity 65 of the PCM and is the SCI transmit.