P1656

P1656 - OCV Circuit Malfunction

CIRCUIT DESCRIPTION

DTC Detecting Condition:

VVT system controls the intake valve timing properly according to the 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 the VVT controller changes relative position between the camshaft and the crankshaft.

Wiring Diagram:

INSPECTION PROCEDURE

HINT: Read freeze frame data using the TOYOTA hand-held tester or OBDII scan tool, as freeze frame data 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 was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction.

Step 1 - 3:

Step 4:

TOYOTA hand-held tester:

Step 1:

Step 2 - 3:

OBDII scan tool (excluding TOYOTA hand-held tester):