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Home >> Lexus >> 2006 >> LS 430 >> Repair and Diagnosis >> Engine Performance >> System >> SFI System - Diagnostics >> DTC P0011, P0012, P0021, P0022: Camshaft Position "A" - Timing Over-Advanced Or System Performance (Bank1)/(Bank 2), Camshaft Position "A" - Timing Over Retarded (Bank 1)/(Bank2) >> Monitor Description

Monitor Description

The ECM optimizes the valve timing using the VVT system to control the intake valve camshaft. The VVT system includes the ECM, the OCV and the VVT actuator. The ECM sends a target "duty-cycle" control signal to the OCV. This control signal, applied to the OCV, regulates the oil pressure supplied to the VVT controller. The VVT controller can advance or retard the intake valve camshaft.

Example:

A DTC will set if: 1) the difference between the target and actual valve timing is more than 5 degrees of the Crankshaft Angle (CA) and the condition continues for more than 4.5 seconds; or 2) the OCV is forcibly activated 63 times or more.

Advanced cam DTCs are subject to 1 trip detection logic. Retarded cam DTCs are subject to 2 trip detection logic.

The monitor runs if all the conditions below are met:

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