P1656

CIRCUIT DESCRIPTION

DTC Detection Condition:

VVT system controls the intake valve timing properly 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.

Wiring Diagram:

INSPECTION PROCEDURE

HINT: Read freeze frame data using TOYOTA hand-held tester or OBD II scan tool, as freeze frame data records the engine conditions when a 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.

Steps 1 - 2:

Steps 3 - 4:

TOYOTA hand-held tester:

Steps 1 - 2:

Step 3:

OBD II scan tool (excluding TOYOTA hand-held tester):