P1656 LEXUS, TOYOTA: OIL CONTROL VALVE CIRCUIT MALFUNCTION
POST UPDATED IN June, 2023
P1656 LEXUS, TOYOTA: OIL CONTROL VALVE CIRCUIT MALFUNCTION
The VVT (Variable Valve Timing) System controls the timing of the intake valve so that it adapts to driving conditions. The Oil Control Valve is included in these systems (OCV). Its function is to regulate oil supply to a designated VVT bucket to advance or retard timing through changes in the camshaft angle position.
The ECM (Engine Control Module) provides the VVT with various electrical signals that inform it of the oil flow adjustment that is required to be made. Since the VVT hubs depend on a continuous and pressurized oil flow for proper performance, the ECM uses the Oil Control Valve to ensure that the valve timing is right, and the pressure is maintained within the proper levels to change the relative position between the camshaft and crankshaft.
Toyota and Lexus vehicle manufacturers use the P1656 OBDII fault code to indicate that a malfunction has been detected in the Oil Control Valve circuit, and it is caused by a short or open circuit.
The P1656 OBD2 diagnostic code P1656 is set for the following reasons:
To troubleshoot DTC P1656 OBDII, take into account this: