Diagnostic trouble code (DTC) information

Condition

Fig 1: Identifying ABS And DSA Control Modules

Courtesy of VOLVO CARS OF NORTH AMERICA.

The DSA control module receives wheel speed signals from the ABS control module. The ABS control module converts the wheel sensor AC signal into a pulsed signal for the DSA control module. The signal is pulsed between approximately 0 V and battery voltage. It has a fixed pulse ratio (%duty ≈ 50 %) where the frequency changes with the wheel speed.

Depending on the current wheel speed signal, DTCs DSA-311, DSA-312, DSA-313 or DSA-314 are stored if the vehicle speed exceeds 8 km/h and the DSA control module registers that:

Wheel speed increase or reduction is too great.
The speed of a wheel is less or the same as half the speed of one of the rear wheels.
The speed signal varies considerably.

Substitute Value

The DSA function is disengaged.

Possible Source

Open-circuit in the signal cable.
Short-circuit to supply voltage or ground in the signal cable.
Interference in the wheel sensor circuit.
Contact resistance in the terminals.

NOTE:

Diagnostic trouble code(s) (DTC(s)) may be stored if the car is driven with one or more wheels locked. Fault causes of this type are not included in the fault-tracing procedure.

NOTE:

Diagnostic trouble code(s) (DTC(s)) may be stored if the power supply and / or the ground terminal for the ABS control module is defective. Fault causes of this type are not included in the fault-tracing procedure.

Fault symptom[s]

The DSA warning lamp lights.
The anti-spin function is not operative while the DSA function is disengaged.