P0012 2005 TOYOTA COROLLA - Camshaft Position 'A' Timing Over-Retarded Bank 1 3ZZ-FE Engine
Repair Importance Level:
Repair Difficulty Level:
P0012 2005 Toyota Corolla Possible Causes
- Low or Dirty Engine Oil
- Faulty variable valve timing (VVT)
- Faulty oil control valve (OCV)
- Variable Valve Timing (VVT) harness is open or shorted
- Oil Control Valve (OCV) harness circuit is open or shorted
- Damaged ECM
P0012 2005 Toyota Corolla Tech Notes
Valve timing may have to be adjusted.When is the code detected?
After the ECM sends the target duty cycle signal to the OCV, the ECM monitors the OCV current to establish an actual duty cycle. The ECM determines the existence of a malfunction and sets the DTC when the actual duty cycle ratio varies from the target duty cycle ratio.P0012 2005 Toyota Corolla Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Possible Lack/Loss of power
- Possible Engine rough idle
P0012 2005 Toyota Corolla Meaning
The Engine Control Module (ECM) controls the Oil Control Valve (OCV) to regulate the intake camshaft angle. As a result of the angle change, the engine timing is advance or retard. Optimizing engine timing will help the engine improve torque and fuel economy, and the exhaust emissions decrease under overall driving conditions. The Variable Valve Timing (VVT) system includes the Oil Control Valve (OCV) and VVT controller. The ECM detects the actual intake valve timing using signals from the camshaft and crankshaft position sensors, and performs feedback control.