SECTION VI TROUBLESHOOTING
2005 Tech 2 User’s Guide VI - 15
IMPORTANT
If not properly grounded, the CANdi module will appear to be defective when it is not. The CANdi
module will fail due to improper grounding if you use the 16-pin DLC (J-1962) connector and power the
Tech 2 from an AC/DC power supply. The adapter you use must have a GM part number. Although PVI
adapters are similar to GM adapters, they will not work with the CANdi module.
CANdi Module Troubleshooting Guide
If a CANdi module is not functioning properly, please perform the following tests:
1. Make sure the CANdi module is properly grounded by connecting to a vehicle or by using the 12-pin
ALDL connector, which has the signal and chassis ground shorted.
2. Verify that the Tech 2 passes all stand-alone self-tests. Replace the Tech 2 if it fails. If the Tech 2
passes, proceed to step three. The CANdi module must be disconnected to run self-tests. If the
CANdi module is connected, a message will appear instructing you to disconnect the module.
3. Verify that the VCI passes self-tests. Replace the VCI if it fails. If the VCI passes, proceed to step four.
The CANdi module must be disconnected to run self-tests. If the CANdi module is connected, a
message will appear instructing you to disconnect the module.
When performing this test, you must also perform the Selectable VCI test (option F4 on the self-test
menu—see Figure VI-15). First install the Burndy loopback adapter into the VCI 26-pin connector,
which does not require the cable. Once you select “Selectable VCI,” select the “More Tests” soft key
(Figure VI-16). In the new submenu, select “F6: VCI TPU” (Figure VI-17). If the VCI passes the test, all
the TPU channels will display a Pass indicator as shown in the example at the top of the next page.
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