Diagnostic trouble code (DTC) information ECM-431D

Condition 

Fig 1: Identifying Leak Diagnostic Pump

Courtesy of VOLVO CARS OF NORTH AMERICA.

The engine control module (ECM) checks the control signal to the heater element in the leak diagnostic unit.

The diagnostic trouble code (DTC) is stored if the engine control module (ECM) detects that the signal is too low.

The diagnostic trouble code (DTC) can be diagnosed when the engine is running.

Substitute Value 

• None.

Possible Source 

• Short-circuit to ground in the signal cable.
• Damaged leak diagnostic pump.

Fault symptom[s] 

• None.