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Home >> Lexus >> 2008 >> IS 250 RWD, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 177 (Engine Control System (2GR-FSE) - DTC P0010 - P0159) >> DTC P0014 Camshaft Position "B" - Timing Over-Advanced or System Performance (Bank 1); DTC P0015 Camshaft Position "B" - Timing Over-Retarded (Bank 1); DTC P0024 Camshaft Position "B" - Timing Over-Advanced or System Performance (Bank 2); DTC P0025 Camshaft Position "B" - Timing Over-Retarded (Bank 2) >> Monitor Description

Monitor Description

WARNING: This page is about a different car, the 2008 Lexus IS 350. However, it is still accessible from the selected car via links, so may be relevant.
  1. The ECM optimizes the exhaust valve timing using the VVT (Variable Valve Timing) system to control the exhaust camshaft. The VVT system includes the ECM, the Oil Control Valve (OCV) and the VVT controller.
  2. The ECM sends a target duty-cycle control signal to the OCV. This control signal regulates the oil pressure supplied to the VVT controller. The VVT controller can advance or retard the exhaust camshaft.

    If the difference between the target and actual exhaust valve timing is large, and changes in actual exhaust valve timing are small, the ECM interprets this as the VVT controller stuck malfunction and sets a DTC.

    Example:

    A DTC is set when the following conditions A, B and C are met:

    1. The difference between the target and actual exhaust valve timing is more than 5°CA (Crankshaft Angle) and the condition continues for more than 4.5 seconds (Procedure "A").
    2. It takes 5 seconds or more to change the valve timing by 5°CA (Procedure "B").
    3. After above procedures "A" and "B" are met, the OCV is forcibly activated 63 times or more (Procedure "C").
  3. DTCs P0014 and P0024 (Advanced Cam Timing) are subject to 2 trip detection logic.
  4. DTCs P0015 and P0025 (Retarded Cam Timing) are subject to 1 trip detection logic.

    These DTCs indicate that the VVT controller cannot operate properly due to OCV malfunctions or the presence of foreign objects in the OCV.

  5. The monitor will not run unless the following conditions are met:
    1. The engine is warm (the engine coolant temperature is 75°C [167°F] or more).
    2. The vehicle has been driven at more than 40 mph (64 km/h) for 3 minutes.
    3. The engine has idled for 3 minutes (retarded angle side only).
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