GMC Tech2 - Page 60

General Motors Tech2 User Guide
60
VCI MODULE DIAGNOSTIC CHART (continued)
Test
Results
Solution
VCI J1708
Internal transceiver – pass/fail
Differential – pass/fail
Differential – pass/fail (results
from selectable VCI test)
For any failure, cycle
Tech2 and retest.
If problem persists,
contact Customer
Support.
VCI TPU
(Time Processor
Unit)
TPU0 - pass/fail
TPU1 - pass/fail
TPU5 - pass/fail
TPU12 & TPU15 - pass/fail (or
not tested if
no loopback)
TPU13 & TPU14 - pass/fail (or
not tested if
no loopback)
For any failure, cycle
Tech2 and retest.
If problem persists,
contact Customer
Support.
VCI level shifters
MUX A 2.5 V Hi - pass/fail
MUX A 2.5 V Lo - pass/fail
MUX A 5.0 V Hi - pass/fail
MUX A 5.0 V Lo - pass/fail
(results from
selectable VCI test)
For any failure, cycle
Tech2 and retest.
If problem persists,
contact Customer
Support.
Diagnostic chart for Tech2 Vehicle Communications Interface (VCI) module