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Home >> Volvo >> 2008 >> S40 T-5, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 40 (Ignition And Control Systems - Design And Function (644 Body)) >> Diagnostic Functions (B4204T2 CVVT; 2000) >> Reading off the Volvo on-board diagnostic (OBD) system >> Reading and erasing diagnostic trouble codes (DTCs)

Reading and erasing diagnostic trouble codes (DTCs)

WARNING: This page is about a different car, the 2004 Volvo S40, 2003 Volvo S40, 2002 Volvo S40, 2001 Volvo S40, and 2000 Volvo S40. However, it is still accessible from the selected car via links, so may be relevant.

Stored diagnostic trouble codes (DTCs) can be read off and erased using this function. The on-board diagnostic (OBD) system can identify 17 different faults in the form of diagnostic trouble codes (DTCs).

NOTE: Diagnostic trouble codes (DTCs) DSA-112, DSA-223, DSA-224 and DSA-233 are only stored in the DSA control module while the ignition is on/the engine is running. When the ignition is switched off, these diagnostic trouble codes (DTCs) are erased. Therefore the engine must be started before diagnostic trouble codes (DTCs) are read off from the control module. This is so that the control module is able to re-check and store diagnostic trouble codes (DTCs).

Diagnostic trouble codes (DTCs) can only be erased when all diagnostic trouble codes (DTCs) have been read at least once.

NOTE: After the diagnostic trouble codes (DTCs) are erased the DSA function is disengaged. The DSA function is re-engaged using the DSA switch. If no diagnostic trouble codes (DTCs) have been stored, the DSA warning lamp goes out after engagement.
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