Generic Scan Tool (GST) Function: Description
WARNING: This page is about a different car, the 2005 Nissan Xterra. However, it is still accessible from the selected car via links, so may be relevant.
Generic Scan Tool (OBD II scan tool) complying with SAE J1978 has 8 different functions explained below.
ISO9141 is used as the protocol.
The name GST or Generic Scan Tool is used in this information.
Courtesy of NISSAN MOTOR CO., U.S.A.