The CVVT (Continuously Variable Valve Timing) system is installed to the chain sprocket of the intake camshaft. This system controls the intake camshaft to provide the optimal valve timing for every driving condition. The PCM controls the Oil Control Valve(OCV), based on the signals output from mass air flow, throttle position and engine coolant temperature. The CVVT controller regulates the intake camshaft angle using oil pressure through the OCV. As result, the relative position between the camshaft and the crankshaft becomes optimal, and the engine torque improves, fuel economy improves, exhaust emissions decrease under overall driving conditions.
When PCM detects open in the OCV(Bank 1-IN) control circuit, PCM sets DTC P0075.
Item
Detecting Condition
Possible Cause
DTC Strategy
Circuit continuity check, open
Poor connection
Open or Short to ground in power circuit
Open in control circuit
OCV
Enable Conditions
-
Threshold value
Open
Diagnosis Time
Continuous
MIL On Condition
2 Driving Cycles
ITEM
Specification
Resistance (?)
9.4 ~10.4 at 20?(68?)
Fig.1) Normal waveform of OCV at idle.
Fig.2) Normal waveform of OCV at acceleration.