P0076

Component Location






General Description

The CVVT (Continuously Variable Valve Timing) system built on the camshaft helps the engine decrease the exhaust gas and increase engine power and fuel economy by changing the valve open/close timing of the camshaft continuously. The valve control solenoid, the main control part of the CVVT, changes the direction of the oil path through the CVVT by the duty control of the ECM and changes the open and close timing of the intake and exhaust valves.

DTC Description

ECM sets DTC P0076 if the ECM detects that the intake valve control solenoid control circuit is short to ground.

DTC Detecting Condition






Specification










Diagnostic Circuit Diagram






Signal Waveform & Data

1. Connect GDS and select Data Analysis.
2. After warming-up, check following items.






3. Data analysis
> A Sector : CVVT works
> B Sector : Limp Home Mode (CVVT doesn't work.)
> CVVT Control Flow (A Sector)
: Acceleration pedal(1) shift -> Engine RPM change -> Camshaft Position Set point (2) change -> CVVT Valve Duty(3) change -> Inlet CAM Position(4) change

Monitor DTC Status

1. Connect GDS and select "DTC Analysis" mode
2. Click "DTC Status" on the menu bar to see DTC's information.
3. Confirm that "DTC Readiness Flag" indicates "COMPLETED". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions.
4. Read "DTC Status" parameter.






5. Is parameter displayed "History(Not Present) fault"?

NOTE:
- History (Not Present) fault : DTC occurred but has been cleared.
- Present fault : DTC is occurring at present time.






Component Inspection

1. Ignition "OFF"
2. Disconnect oil control valve connector
3. Measure resistance between power terminal and control terminal of the solenoid connector(Component side).
Specification






4. Is resistance within specification?






Power Circuit Inspection

1. Ignition "ON" & Engine "OFF"
2. Measure voltage between power terminal of the oil control valve harness connector and chassis ground.

Specification :Approx. B+

3. Is voltage within specification?






Control circuit inspection

1. Measure voltage between control terminal of the oil control valve harness connector and chassis ground.

Specification :Approx. 3 - 4V






NOTE:
Signal waveform in control circuit with ignition ON & Engine OFF

2. Is voltage within specification?






Terminal and Connector Inspection

1. Many malfunctions in the electrical system are caused by poor harness(es) 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?






Verification of Vehicle Repair

After a repair, it is essential to verify that the fault has been corrected.
1. Connect GDS and select "DTC Analysis" mode.
2. Click "DTC Status" and confirm that "DTC Readiness Flag" indicates "Complete". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions.
3. Read "DTC Status" parameter.
4. Is parameter displayed "History(Not Present) fault"?