Diagnostic Trouble Code (DTC) Information ECM-92B0

Condition 

Fig 1: Identifying Throttle Unit & Potentiometer

Courtesy of VOLVO CARS CORPORATION

The diagnostic trouble code (DTC) is stored if the engine control module (ECM) fails to carry out its first adaptation of the electronic throttle unit. This is because the programmed parameter for the stop position in the throttle position (TP) sensor has been exceeded. This adaptation is normally run during manufacture of the vehicle. However the electronic throttle unit must be adapted again if the software, the engine control module (ECM) or the throttle unit is replaced. If other diagnostic trouble codes (DTCs) are stored, these must be remedied first. These may have caused the adaptation to fail.

Substitute Value 

• The engine control module (ECM) uses nominal values for the throttle unit parameters
• The engine control module (ECM) shuts down the supply to the damper motor for the electronic throttle unit. The throttle will set itself to the return position.

Possible Source 

• The throttle is sticking or is blocked (e. g. oil film, dust)
• Contact resistance or oxidation in the terminals between the engine control module (ECM) and the electronic throttle unit
• Damaged throttle unit.

Fault symptom[s] 

• Malfunction indicator lamp (MIL) lit
• Poor performance.