Diagnostic trouble code (DTC) information

Condition

Fig 1: Identifying Circuit Between ECM And DSA Control Module

Courtesy of VOLVO CARS OF NORTH AMERICA.

During anti-spin control, the DSA control module transmits a signal to the engine control module (ECM) which requests torque limiting.

Diagnostic trouble code (DTC) EFI-91 is stored if: The signal cable for the DSA control module is short-circuited to ground, short-circuited to supply voltage or there is an open-circuit in the circuit (signal missing). The signal from the DSA control module exists but is faulty (faulty signal). There are diagnostic trouble codes (DTCs) in the DSA control module (DTCs in the DSA). The initiating signal from the DSA control module is missing or is faulty (initiating fault).

Substitute Value

DSA deactivated.

Possible Source

Signal missing:

Open-circuit in the signal cable.
Short-circuit to ground in the signal cable.
Short-circuit to supply voltage in the signal cable.
Faulty DSA.

Faulty signal:

Contact resistance in the terminals.
Loose connections.
Faulty DSA.

Diagnostic trouble code (DTC) in the DSA:

Diagnostic trouble code (DTC) in the DSA.

Initiating fault:

Contact resistance in the terminals.
Loose connections.
Faulty DSA.

Fault symptom[s]

None.