Diagnostic Trouble Code (DTC) Information ECM-431A

Condition 

Fig 1: Identifying Volvo Leak Detection Pump (Leak Diagnostic Unit)

Courtesy of VOLVO CARS CORPORATION

The engine control module (ECM) checks the function of the leak diagnostic unit by measuring the current through the leak diagnostic pump.

A diagnostic trouble code (DTC) is stored if the engine control module (ECM) registers that the voltage curve is rough the engine control module (ECM) interprets this as an incorrect reference reading.

The diagnostic trouble code (DTC) can be diagnosed when the leak diagnostic system is run.

Substitute Value 

• Leak diagnostics interrupted.

Possible Source 

• Dirt or damp in the pump
• Damaged heater element in the pump
• Damaged leak diagnostic pump.

Fault symptom[s] 

• Malfunction indicator lamp (MIL) lit.