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Troubleshooting the System
Troubleshooting D Codes
This section describes the 800 system diagnostic codes (D codes) and messages,
the conditions that cause them, and possible solutions. D codes identify changes in
the system operation that require corrective action. Some D codes also contain a
qualifier after the message.
The qualifier indicates a specific condition related to the D code. For example, D2
indicates excessive drift for a sensor. The qualifier identifies the sensor that has
excessive drift. The D code, D2 Excessive Drift pO
2
, indicates that the pO
2
sensor
has excessive drift. A qualifier that is a number, such as the number 6 in D35
Electronics Error (6), is important information for the Service Representative.
The system displays D codes in the status area. When the system displays a D
code, the View Status F-key appears on the screen. The Not Ready screen appears
if the D code prevents the system from being ready. Press
View Status to display
the View Status screen.
The View Status screen lists D codes and messages on the left side. The right side
of the screen displays possible solutions associated with the D code that is
highlighted on the left side.
Press
Troubleshooting to access the list of system diagnostic tests. Use these tests
to troubleshoot D code problems as required.
The section that follows identifies each D code and message, describes the
problems that cause the D code, and provides a list of solutions arranged in the
appropriate sequence for the problem.
Perform the procedures in sequence until you resolve the problem. If you cannot
resolve the problem, contact your Bayer Diagnostics Service Representative.