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Diagnostic Trouble Codes

WARNING: This page is about a different car, the 2008 Acura TSX, 2007 Acura TSX, 2006 Acura TSX, 2005 Acura TSX, and 2004 Acura TSX. However, it is still accessible from the selected car via links, so may be relevant.

There are three DTC types used by the CAN networks.

COMBINATION SWITCH CONTROL UNIT

Internal error DTCs The ECUs run internal checks. If one finds that there is an internal ECU problem, it will set an internal error DTC. Confirm that the battery and charging system are OK. If so, this indicates that the ECU needs to be replaced.
Loss of communication DTCs Loss of communication DTCs (and Bus-off DTCs) are set when there is a problem with the communication between ECUs. This could be in the connections, the wiring, or the ECU (as called out in the DTC Troubleshooting).
Signal error DTCs The ECUs can run diagnostics on some input circuits to determine if that circuits is functioning properly (no opens or shorts). If a circuit falls the diagnostic test, a DTC will set (NOTE: Not all input circuits are tested for errors).
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