Diagnostic Trouble Code (DTC) Information

Condition 

Fig 1: Identifying Throttle Unit & Potentiometer

Courtesy of VOLVO CARS OF NORTH AMERICA.

This diagnostic trouble code (DTC) is never stored on its own.

Diagnostic trouble code (DTC) ECM-903C will also be stored if the engine control module (ECM) registers, when the ignition is switched on, that diagnostic trouble code (DTC) ECM-9150 and/or ECM-9160 is stored (fault in the throttle position (TP) sensor for the throttle unit).

Substitute Value 

None.

Possible Source 

Faulty signal: 

• Fault in the throttle position (TP) sensor circuit for the throttle unit.

Fault symptom[s] 

• Malfunction indicator lamp (MIL) lit.