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Home >> GMC >> 2002 >> Jimmy 2D Utility, Part Time, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 1705 (Data Link Communication System) >> Diagnostic Information and Procedures >> DTC U1304: PCM To EBCM Communication >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2002 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.

The UART serial data line allows information to be exchanged from module to module as needed. The UART system is a master/slave arrangement with the PCM as the Master. The PCM requests and sends the information that is transmitted on the UART line.

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