Candi Module Software Updates - GMC Tech2 User Manual

1. Ensure the connection of the DLC (VCI) loopback adapter (Part Number 3000109) to
the VCI module of the Tech2.
2. Navigate to the self test option: At the Tech2 Main Menu, select F3: Tool Options, and
then choose Self Test.
3. Select the test F2: Automated VCI. Screen 1 (shown below) should appear if the test
passes. (Note: If failures are noticed on the CCD test and the HBCC test, these will not
affect diagnostics on GM vehicles.)
4. Select F4: Selectable VCI and press the More Test soft key. Choose F1: VCI Dual
Uart. Screen 2 appears if the test passes.
5. Select F5: VCI J1708, and Screen 3 will display.
6. Select F6: VCI TPU, and Screen 4 will display.
NOTE: When performing the TPU test, it is critical that TPU12 and TPU15 indicate "Pass."
If these two TPU channels indicate "Fail," or if they are not present in the above list, then
the VCI module for the Tech2 is possibly damaged.
7. Insert the DLC Burndy cable into the Tech2/VCI and the DLC loopback adapter at the
end of the cable and repeat the tests listed above. (Note: When running the VCI TPU
test, TPU12 and TPU15 must show up as pass. If they indicate, "fail," or if they are not
present on the screen, then the cable might be damaged. This is assuming that TPU12
and TPU15 passed with the VCI loopback adapter connected directly into the VCI.
Also, when performing the VCI TPU test, TPU13 and TPU14 will not appear on the
screen when running this test with the DLC Burndy cable inserted into the Tech2/VCI
and the loopback adapter at the end of the cable.)

CANdi Module Software Updates

IMPORTANT: You must update the PCMCIA (32-megabyte) card first before connecting
the CANdi module to the Tech2. Always disconnect the CANdi module from the Tech2
before downloading any software updates to the PCMCIA card.
The CANdi module has the capability to store three different software versions.
Software updates for the CANdi module are stored on the 32-megabyte PCMCIA card. The
CANdi module will be automatically updated when it is connected to the vehicle's DLC and
the Tech2 is powered on. When a CANdi module is updated, a screen will be displayed.
Software update progress will be displayed on the Tech2 screen. If any problems occur
concerning the update, they will be displayed on the Tech2. (Refer to the Troubleshooting.)
After a successful update, the current CANdi software version can be obtained by
selecting:
F9: CANdi Diagnostics - from the Tool Options menu.
F0: POST Results - from the CANdi Diagnostics menu.
The CANdi POST Results screen can also be used to determine if the module had any
problems during the software update or start-up sequence. Customer Support may also
use the information from the CANdi POST Results screen, if you encounter any problems
during an update.
General Motors Tech2 User Guide
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