Standard Corporate Protocol

The SCP is a communication language used by Mazda for exchanging bi-directional messages (signals) between electronic modules. Two or more signals can be sent over one SCP network circuit.

Included in these messages is diagnostic data that is output over the BUS+ and BUS- lines to the DLC. PCM connection to the DLC is typically done with a two wire, twisted pair cable used for network interconnection. The diagnostic data such as self-test or PIDs can be accessed with WDS or equivalent tester.