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Group 28 Troubleshooting
Reading/Clearing Fault Codes
Fault codes can be read and cleared using the VCADS
Pro tool or the Pro-Link tool with Volvo application car-
tridge. See the appropriate service information for details
on reading and clearing fault codes using VCADS Pro or
Pro-Link tools.
On VN-series vehicles, fault codes also can be accessed,
read, and cleared via the instrument cluster graphic dis-
play. Clearing fault codes is password protected. For
information, see “Instrumentation VN, from 3/99 and
VHD,” Volvo Service Publication PV776–TSP139790.”
The Data Link Instrument cluster used WX-series vehi-
cles can access and read a limited number of fault
codes. However, it does not have the ability to clear fault
codes. For more information, see “Data Link Instrumen-
tation,” Volvo Service Publication PV776–381–620SM.
Fault Tracing Strategy
CAUTION
Check that the proper cable and connector location is
observed and used while connecting to the ECU. Fail-
ure to do so may result in permanent damage to the
ECU or the tool.
Generally, the fault tracing strategy employed in this sec-
tion follows a set sequence in which measurements are
taken at specific points in the vehicle wiring. The three
basic elements in this strategy are:
W3003493
1 Vehicle Electronic Control Unit (VECU)
2 The actual component being tested (varies with
each fault code)
3 Wiring between VECU and the component being
tested
The following information describes the three test strate-
gies:
•
“Measurement at the Component’s Connector, to
the VECU” page 90
•
“Check of Component” page 90
•
“Check of the Subsystem” page 91
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