Purpose And Scope Of Self Test (Semi-Test) - GDS VCI User Manual

User's Manual
Hardware

Purpose and Scope of Self Test (Semi-Test)

The self-test functions are used to check the DLC Main Cable and specific related circuits. Not all VCI
circuits are checked with the self-test functions.
Basic operation of the self-test function is the loop-back theory.
Loop-back theory is verification between sent data from the VCI module and returned data, which
passed through the pins of all the outside connectors during the self-test.
Some communication circuits such as high speed CAN, low speed CAN and SAE-J1708, cannot be
checked with loop-back tests.
There are 2 self-test steps included in the Self Test function on the Configuration menu.
Step A: Performs test functions by automatically changing circuit configurations at the inner end
of DLC connector of the VCI module.
Step B: Performs test functions on the DLC main cable using the self-test adapter which will short
all the terminals (except power and ground functions) at the end of DLC main cable.
This self-test function cannot determine open or short circuits in other adapter cables except Cable-
DLC (26pin-16pin). Also, Wireless network functions and the VCI internal memory cannot be tested
using this function. If there are any open or shorted USB circuits, this self-test function cannot be
performed.
Self Test Adapter
21
Module: A–01-006 (p.01)