P0012

DTC P0012






GENERAL DESCRIPTION
Different from the existing fixed cam phase angle type, CVVT (Continuously Variable Valve Timing) is the device which varies cam phase angle continuously to be optimum. And with engine oil pressure, it operates. CVVT consists of OCV (Oil Control Valve) and cam phaser. OCV, mounted on cylinder head, controls the amount and direction of oil delivered to cam phaser by oil valve which is connected to a solenoid. Cam phaser, rotating cam phaser rotor with pressure and amount of oil produced by OCV, rotates cam shaft forcefully for or against the rotating direction and finally, cam shaft phase changes. With the appliance of CVVT, engine power,fuel efficiency and the quality of exhaust gas are improved.

DTC DESCRIPTION
If "Counter of (original target - actual angle) 3 Deg" is over 10 times under enable conditions, ECM/PCM sets DTC P0012.

DTC Detecting Condition:

SPECIFICATION
ITEM SPECIFICATION
Coil Resistance (ohm) 6.9 - 7.9 ohms at 20 °C (68 °F)

Schematic Diagram - A/T:

Schematic Diagram - M/T:

Signal Waveform And Data:

MONITOR SCANTOOL DATA
1. Connect scantool to Data Link Connector(DLC).
2. Warm up the engine to normal operating temperature.




3. Monitor the "OCV" parameters on the scantool.
4. Are the parameters displayed correctly ?

YES - Fault is intermittent caused by poor contact in the sensor's and/or ECM's connector or was repaired and ECM/PCM memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of vehicle Repair" procedure.

NO - Go to ""Terminal and Connector Inspection"" procedure.

TERMINAL AND CONNECTOR INSPECTION
1. Many malfunctions in the electrical system are caused by poor harness and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found?

YES - Repair as necessary and go to "Verification of vehicle Repair" procedure.


NO - Go to "System inspection" procedure.

SYSTEM INSPECTION
1. Visual check.
a. Check engine oil gauge.
b. Check contamination of engine oil.
c. Check contamination of OCV filter.
d. Check clog of oil path.
e. Is there any problem?

YES - Repair as necessary and go to "Verification of vehicle Repair" procedure.

NO - Go to "Component inspection" procedure.

COMPONENT INSPECTION
1. Check OCV
a. Connect scantool to Data Link Connector(DLC).
b. Key "ON".




c. Perform "Actuation Test" for OCV.
d. Does the OCV work normally (Check Clicking Sound)?

YES - Substitute with a known - good CVVT and check for proper operation. If the problem is corrected, replace CVVT and then go to "Verification of Vehicle Repair" procedure.

NO - Substitute with a known - good OCV and check for proper operation. If the problem is corrected, replace OCV and then go to "Verification of Vehicle Repair" procedure.

VERIFICATION OF VEHICLE REPAIR
After a repair, it is essential to verify that the fault has been corrected.
1. Connect scan tool and select "Diagnostic Trouble Codes(DTCs)" mode.
2. Clear the DTCs and Operate the vehicle within DTC Enable conditions in General information.
3. Are any DTCs present ?

YES - Go to the applicable troubleshooting procedure.

NO - System is performing to specification at this time.