Diagnostic Functions (B4204T3; 2004): Overview: Other

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.

Every diagnostic trouble code (DTC) has a counter. The counter records the number of fault-free cycles since the diagnostic trouble code (DTC) was stored (intermittent fault). A cycle is defined as the first time the engine speed exceeds 600 RPM in the same interval in which the ignition is switched on (the engine starts) and then switched off. If diagnostic trouble code (DTC) DSA-221 Load signal is stored permanently, the cycle is defined as the first time the average wheel speed exceeds 50 km/h in the same interval in which the ignition is switched on (the engine starts) and then switched off. When a counter is at 0, the control module interprets the fault as permanent. If the counter value is greater than 0, the control module interprets it as no fault (intermittent fault). If the fault recurs, the counter is reset to zero. When the counter reaches 254 (i e. 254 fault-free cycles), the counter is no longer updated.