GMC Tech2 - VCI Module Diagnostic Chart

General Motors Tech2 User Guide
58
VCI MODULE DIAGNOSTIC CHART
Test
Results
Solution
MUX
(Multiplexer)
MUX A: S5 & S14
pass/fail
MUX B: S1 & S3
pass/fail
If MUX A or B fails, cycle
Tech2 power and retest. If
problem persists, contact
Customer Support.
VCI adapter ID
(performed only
during selectable
VCI test)
Recognized adapter
Cannot identify adapter
If adapter fails second
test, contact Customer
Support.
VCI ADC
(Analog to digital
converter)
Channel A - pass/fail
Channel B - pass/fail
If channel A or channel B
fail, cycle Tech2 and
retest. If problem persists,
contact Customer
Support.
Cross point
Pull up - pass/fail
TPU5, TPU1, and TPU0 -
pass/fail (results from selectable
VCI test)
If a failure occurs, cycle
Tech2 and retest.
If problem persists,
contact Customer
Support.
SIPO
(Serial In Parallel
Out)
Pass/fail for each area tested
If a failure occurs, cycle
Tech2 and retest. If
problem persists, contact
Customer Support
DLC
(Data Link
Connector)
DLC1 - DLC2
pass/fail count
DLC2 - DLC1
pass/fail count
If a failure occurs, cycle
Tech2 and retest.
If problem persists,
contact Customer
Support.
CCD
(Chrysler
Collision
Detection)
CCD - pass/fail
CCD - loopback not connected
Connect loopback and
retest if loopback not
connected. If test fails,
disregard results. Test is
not for GM vehicles (other
than Saab) at this time.