Diagnostic trouble code (DTC) information

Condition 

Fig 1: Identifying Ignition In Off Position

Courtesy of VOLVO CARS OF NORTH AMERICA.

Diagnostic trouble code (DTC) ECM-170F is stored if the boost pressure sensor's registered pressure deviates from the atmospheric pressure sensor's registered pressure. This comparison is made at engine start (at approximately 500 RPM) before the turbocharger (TC) has built up a boost pressure.

Substitute Value 

Possible Source 

Faulty signal 

• contact resistance in terminals
• defective boost pressure sensor
• defective atmospheric pressure sensor

Fault symptom[s] 

• none