Toyota Corolla (E120) 2002–2008 Repair Manual / Diagnostics / Sfi system / Camshaft position ”a” –timing over / Circuit description

Toyota Corolla (E120): Circuit description

Refer to dtc p0010

Dtc no.	Dtc detection condition	Trouble area
P0011	Condition (a) or (b) continues after engine is warmed up and engine speed at 550 to 4,000 rpm (problem of the advanced ocv):  valve timing does not change from current valve timing  current valve timing is fixed	Valve timing oil control valve Camshaft timing gear assy ecm
P0012	Condition (a) or (b) continues after engine is warmed up and engine speed at 550 to 4,000 rpm (problem of the retarded ocv):  valve timing does not change from current valve timing  current valve timing is fixed

Monitor description

The ecm optimizes the valve timing using the variable valve timing (vvt) system to control the intake valve camshaft. The vvt system includes the ecm, the oil control valve (ocv) and the vvt controller. The ecm sends a target ”duty–cycle” control signal to the ocv. This control signal, applied to the ocv, regulates the oil pressure supplied to the vvt controller. The vvt controller can advance or retard the intake valve camshaft.

Example: when a difference between the targeted and actual valve timing is more than 5 camshaft angle ”ca” and this condition continues for more than 4.5 Sec, and if the ocv is forcibly activated 63 times or more.

Advanced cam dtcs are subject to ”1 trip” detection logic.

Retarded cam dtcs are subject to ”2 trip” detection logic.

Monitor strategy

Typical enabling conditions

Typical malfunction thresholds

Wiring diagram

Refer to dtc p0010