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VCT or Variable Cam Timing allows the intake camshaft to rotate relative to the camshaft sprocket. The VCT system must be in positive dead stop for the engine to be 100% in time.

Failure to ensure the VCT system is in positive dead stop will result in poor engine performance and DTCs P1381 or P1383

With the intake sprocket torqued, and the timing bar removed, attempt to rotate the intake camshaft with a proper open end wrench counterclockwise while holding the VCT housing with a strap wrench. The intake camshaft should not move. If so, you are at positive dead stop.

Rotate the camshaft clockwise no more than 1/4 of a rotation. You will hear oil sputter and drain from the VCT system. Rotating more than 1/4 of a rotation could result in permanent engine damage.

Attempt this counterclockwise rotation again. When you reach the limit of motion, you are at positive dead stop.

If your VCT gear is at positive dead stop and your intake camshaft is at TDC (the bar slides in) then torque the cap to 37 Nm

See this forum post for more information on clocking the VCT gear

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