Generic Scan Tool (GST) Function: Description
WARNING: This page is about a different car, the 2006 Infiniti G35. 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 service manual.
Courtesy of NISSAN MOTOR CO., U.S.A.