D439E Service Manual 5. Service Tool
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Self Test Adapter
The self-test functions are used to check the Main DLC cable (P/No: 150109 - 00050) and specific related
circuits. Not all G-scan circuits are checked through the self-test functions.
Purpose and Scope of Self Test (Semi-Test)
Basic operation of the self-test function is the loop-back theory.
Loop-back theory is verification between sent data from 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.
• Step A :
Performs test functions by automatically changing circuit configurations at the inner end of DLC connector of
G-scan module.
• Step B :
Performs test functions on the Main DLC cable using the self-test adapter which will short all the terminals
(except power and ground functions) at the end of Main DLC cable.
This self-test function cannot determine open or short circuits in other adapter cables except Cable-DLC
(P/No: 150109 - 00050).
Connecting the Self-Test Adapter
Before performing the self-test function, connect the Main DLC cable (P/No: 150109 - 00050) between G-scan
module and Self-test adapter. Then, connect the other side of Self-test Adapter to the OBD-∥ Connector on
the vehicle as shown in [Figure1].
<Figure 1: Installation of the Self-test adapter>
After installing the adapter, follow the instructions as indicated on the Self-Test screen located on the
configuration menu.
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