Diagnostic Trouble Code (DTC) Information ECM-611B

Condition 

Fig 1: Identifying Variable Valve Timing (VVT) Unit

Courtesy of VOLVO CARS CORPORATION

The engine control module (ECM) checks that the position of the intake camshaft (actual value) corresponds to the requested position (desired value).

The diagnostic trouble code (DTC) is stored if the requested position is not reached.

The diagnostic trouble code (DTC) can be diagnosed while the engine is running and while camshaft control is active.

Substitute Value 

None.

Possible Source 

• Low oil pressure
• Poor oil quality
• Damaged reset valve
• Mechanical fault in the variable valve timing (VVT) unit.

Fault symptom[s] 

• Malfunction indicator lamp (MIL) lit.