Diagnostic trouble code (DTC) information

Condition

Fig 1: Identifying Engine Control Module (ECM) And DSA Control Module

Courtesy of VOLVO CARS OF NORTH AMERICA.

The throttle position (TP) sensor signal from the engine control module (ECM) is a pulsed signal (between approximately 0 V and battery voltage) with a fixed frequency (approximately 50 Hz). The pulse ratio (% duty) changes as the throttle opens. If the engine control module (ECM) registers a fault in the signal from the throttle position (TP) sensor, the engine control module (ECM) transmits a special throttle position (TP) sensor signal to the DSA control module. This informs the DSA control module that the throttle position (TP) sensor signal to the engine control module (ECM) is faulty. Diagnostic trouble code (DTC) DSA-233 is stored when the DSA control module has received this signal.

NOTE: The diagnostic trouble code (DTC) is only stored as long as the ignition is on / the engine is running and the fault is permanent. If the fault in the engine management system disappears (the fault becomes intermittent) the diagnostic trouble code (DTC) in the DSA control module will no longer be stored.

Substitute Value

The DSA function is disengaged.

Possible Source

A diagnostic trouble code (DTC) for the throttle position (TP) sensor has been stored in the engine control module (ECM).

Fault symptom[s]

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