Diagnostic Trouble Code (DTC) Information ECM-436B

Condition 

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

Courtesy of VOLVO CARS CORPORATION

The engine control module (ECM) monitors the power consumption of the pump for the leak diagnostic unit when the leak diagnostic is run.

The diagnostic trouble code (DTC) is stored if the power consumption of the pump fluctuates too much during the reference stage.

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
• Damaged heater element
• Incorrect control of heater element
• Damaged leak diagnostic unit.

Fault symptom[s] 

• Malfunction indicator lamp (MIL) lit.