P2645

DTC P2645 OCV FOR VVTL CIRCUIT (BANK 1)

CIRCUIT DESCRIPTION

DTC Detecting Condition:

In order to improve the engine performance at both high and low engine speeds, the VVTL-i system varies valve lift using the standard cam and high lift cam. This provides the high power engine performance as well as an emission reduction and good fuel economy.

When the engine speed reaches 6,000 rpm, the ECM signals the OCV for VVTL-i to switch the effective cam from standard one to high lift one hydraulically.

The ECM controls the OCV to apply hydraulic pressure to the piston in the rocker arm and switches the rocker arm by locking the slipper for high speed.

MONITOR DESCRIPTION

Monitor Strategy:

Typical Enabling Conditions:

Typical Malfunction Thresholds:

When the engine RPM is high, the VVTL-i actuator advances shims under the high-lift cam followers using engine oil pressure. Switching to the high-lift cam increases the valve lift as well as the intake air volume and exhaust capacity. These changes increase the engine's power output.

When the engine RPM is 6,000 rpm or more, the ECM increases the OCV control signal duty-ratio and it opens the oil passage to the VVTL-i actuator. The engine oil pressure powered actuator advances the cam follower shims and valves begin using the high-lift cam.

The ECM senses the current flow to the OCV to determine the "actual" duty-ratio of the control signal. If the duty-ratio is out of the normal range, the ECM interprets this as malfunction in the OCV. The ECM will illuminate the MIL and a DTC is set.

Wiring Diagram:

INSPECTION PROCEDURE

HINT: Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, as well as other data from the time when a malfunction occurred.

Step 1:

Step 2 - 4:

Hand-held tester:

Step 1 - 3:

OBD II scan tool (excluding hand held tester)

CHECK FOR INTERMITTENT PROBLEMS

Hand-held tester only:
Inspect the vehicle's ECM using check mode. Intermittent problems are easier to detect when the ECM is in check mode with hand-held tester. In check mode, the ECM uses 1 trip detection logic, which has a higher sensitivity to malfunctions than normal mode (default), which uses 2 trip detection logic.
a. Clear the DTCs (See step 2).
b. Set the check mode (See step 3).
c. Perform a simulation test.
d. Check the connector and terminal.
e. Wiggle the harness and connector.