P2647

DTC P2647 OCV FOR VVTL CLOSE MALFUNCTION (BANK 1)

CIRCUIT DESCRIPTION

DTC Detection Conditions:

In order to improve engine performance at low and high engine speeds, the VVTL-i (Variable Valve Timing and Lift-intelligent) system varies the lift of the intake and exhaust valves using the standard (low and mid speeds) cam and high lift (high speed) cam. This delivers high engine performance without affecting fuel economy or emission performance. When the engine speed reaches 6,000 rpm, the ECM signals the OCV for VVTL-i to switch from the standard cam to the high lift cam, using hydraulic (engine oil) pressure. At high engine speeds, the ECM stimulates the OCV (Oil Control Valve) to apply hydraulic pressure to the piston located in the rocker arm, and switches the rocker arm by locking the slipper.

MONITOR DESCRIPTION

Monitor Strategy:

Typical Enabling Conditions:

Typical Malfunction Thresholds:

Component Operating Range:

At high engine speeds, the VVTL-i actuator regulates the hydraulic (engine oil) pressure applied to the shims on the high lift (high speed) cam side. Switching from the standard (low and mid speeds) to high lift cam allows the lift of the intake and exhaust valves to be increased. The engine exhaust capacity is also enhanced. As a result, the engine power is boosted. When the engine speed is 6,500 rpm or more, the ECM increases the OCV control signal duty ratio, and opens the oil passage to the VVTL-i actuator. The actuator activates the shims and the intake and exhaust valves on the high lift cam side. The VVTL-i oil pressure switch is turned ON and OFF to control the hydraulic pressure to the VVTL-i system. The ECM uses a signal transmitted by the switch to determine whether the standard cam or the high lift cam is being used.

If either of the following conditions occurs, the ECM determines that there is a malfunction in the OCV for VVTL-i, and illuminates the MIL and sets a DTC:
- The hydraulic pressure applied to the VVTL-i system is high despite the ECM signaling for the standard cam.
- The hydraulic pressure applied to the VVTL-i system is low despite the ECM signaling for the high lift cam.

Wiring Diagram:

INSPECTION PROCEDURE

HINT: Read freeze frame data using a hand-held tester or OBD II scan tool. Freeze frame data record the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data, from the time the malfunction occurred.

Step 1 - 2:

Step 3 - 4:

Step 5:

Hand-held tester

Step 1 - 2:

Step 3 - 4:

OBD II scan tool (excluding the hand-held tester)

CHECK FOR INTERMITTENT PROBLEMS

HINT:
Hand-held tester only:
Inspect the vehicle's ECM using check mode. Intermittent problems are easier to detect with a hand-held tester when the ECM is in check mode. In check mode, the ECM uses 1trip detection logic, which is more sensitive to malfunctions than normal mode (default), which uses 2trip detection logic.

a. Clear DTCs.
b. Switch the ECM from normal mode to check mode using a hand-held tester.
c. Perform a simulation test.
d. Check and wiggle the harness(es), connector(s) and terminal(s).