Diagnostic Trouble Code (DTC) Information ECM-674D

Condition

Fig 1: Identifying Camshaft Control (CVVT)

Courtesy of VOLVO CARS CORPORATION

The engine control module (ECM) checks the angle of the camshaft (its position in relation to the crankshaft).

If the intake camshaft's angle position deviates and is too low (the camshaft is "after" the crankshaft) during fuel trim, the Engine control module (ECM) interprets this as a fault and stores a DTC.

The control module's test for the diagnostic trouble code (DTC) starts when:

Engine idling
Hot engine.

Substitute Value

None.

Possible Source

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

Fault symptom[s]

Warning lights and chimes/Malfunction Indicator Light ("Check engine" light) indication/no indication