Diagnostic trouble code (DTC) information ECM-433B

Condition 

Fig 1: Identifying Leak Diagnostic Pump

Courtesy of VOLVO CARS OF NORTH AMERICA.

The diagnostic trouble code (DTC) is stored if the engine control module (ECM) detects that there is no signal from the leak diagnostic pump.

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

Substitute Value 

• The leak diagnostic is disabled.

Possible Source 

• Contact resistance in the terminals
• Open-circuit in the signal cable
• Open-circuit in the power cable
• Damaged pump.

Fault symptom[s] 

• Malfunction indicator lamp (MIL) lit.