User's Manual
User’s Manual 
  - 43 -   
Self Test Adapter 
Basic Use of G-scan  Module NO: A-02-006
The  self-test  functions  are  used  to  check  the  Main  DLC  cable  (P/No: 
G1PDDCA001)  and  specific  related  circuits.  Not  all  G-scan  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  G-scan 
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. 
z  Step  A:  Performs  test  functions  by  automatically  changing  circuit 
Configurations  at  the  inner  end  of  DLC  connector  of  the  G-scan 
module. 
Purpose and Scope of Self Test (Semi-Test) 










