Helpful Information

NOTE: The following information is intended to be used in conjunction with the electrical diagrams.

CIRCUIT OPERATION
Circuit A21 supplies battery voltage to the data link connector. Circuit A21 originates at the ignition switch. When the ignition switch is in the START or RUN positions, it connects circuit A1 from the Power Distribution Center (PDC) with circuit A21.

- Circuit D20 connects to cavity 45 of the PCM. Circuit D20 is the SCI receive circuit for the PCM.

- Circuit D21 connects to cavity 25 of the PCM. Circuit D21 is the SCI transmit circuit for the PCM.

- Circuit Z12 provides ground for the data link connector.