Diagnostic Trouble Code (DTC) Information

Condition

Fig 1: Identifying Camshaft Position Angle

Courtesy of VOLVO CARS OF NORTH AMERICA.

The engine control module (ECM) checks that angle position of the camshafts (valve opening and closing angles) as compared to the crankshaft angle position, that is to say the camshaft position relative to the crankshaft position. If the camshaft angle position deviates from the expected angle position when the camshaft is totally returned to is original position, the engine control module (ECM) adapts the deviation. The diagnostic trouble code is generated if the deviation value becomes too high (high signal), too low (low signal) or is changed more than is permitted (faulty signal). The diagnostic trouble code is diagnosed by the engine control module (ECM) when the engine is warm and idling.

Substitute Value

None.

Possible Source

Signal too high

Poor engine oil quality
Incorrectly adjusted camshafts
The timing gear belt has jumped off the cogs
Damaged camshaft reset valve
Mechanical fault in the variable valve timing (VVT) unit.

Signal too low

Poor engine oil quality
Incorrectly adjusted camshafts
The timing gear belt has jumped off the cogs

Faulty signal

Poor engine oil quality
The timing gear belt has jumped off the cogs
Damaged camshaft reset valve
Mechanical fault in the variable valve timing (VVT) unit.

Fault symptom[s]

Malfunction indicator lamp (MIL) lit.