Diagnostic Trouble Code (DTC) Information ECM-433B

Condition 

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

Courtesy of VOLVO CARS CORPORATION

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 the ignition is switched on.

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 in the leak diagnostic unit.

Fault symptom[s] 

• Malfunction indicator lamp (MIL) lit.