P1656

DTC P1656 OCV Circuit Malfunction (bank 1)

CIRCUIT DESCRIPTION
VVT system controls the intake valve timing to proper timing in response to driving condition. ECM controls OCV (Oil Control Valve) to make the intake valve timing properly, and, oil pressure controlled with OCV is supplied to the VVT controller, and then, VVT controller changes relative position between the camshaft and the crankshaft.





DETECTING CONDITIONS





WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:
- If DTC P1656 displayed, check left bank OCV circuit.
- If DTC P1663 displayed, check right bank OCV circuit.
- Read freeze frame data using LEXUS hand-held tester or OBD II scan tool. Because freeze frame records the engine conditions when the malfunction is detected, when troubleshooting it is useful for determining whether the vehicle was running or stopped, the engine warmed up or not, the air-fuel ratio lean or rich, etc. at the time of the malfunction.

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LEXUS hand-held tester

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