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Group 28 Troubleshooting
Check of the Subsystem
In this procedure, the VECU is disconnected, a breakout
box is connected between the VECU and wiring harness,
and measurements are made at specific pin locations on
the breakout box. This check is made to measure the
voltage that is present at the VECU with the circuit intact.
Measurements outside “expected values” may indicate
faults in the component, wiring, or VECU.
Tests Using the VCADS Pro Tool
The VCADS Pro tool is a Windows95
®
-based PC tool
that is used to program, test, and read information from
the VECU and EECU.
A number of “real time” tests can be performed by con-
necting the VCADS Pro tool to the vehicle’s diagnostic
connector. If a test in the VCADS Pro tool may be of
benefit when troubleshooting a specific fault code, that
test will be referenced in the section titled, “Appropriate
tests in the VCADS Pro tool.”
Note: Not all tests will apply to all vehicle variants. When
starting VCADS Pro, menu selections for various vehi-
cles and engines are entered. Only those tests that
apply will be available for selection.
For information about the proper operation of the
VCADS Pro tool, please refer to VCADS Pro Service In-
formation in group 0.
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