Toyota Corolla Repair Manual: Circuit description

Toyota Corolla Repair Manual / Diagnostics / Sfi system / Camshaft position ”a” –timing over / 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 enabling conditions

Typical malfunction thresholds

Typical malfunction thresholds

Wiring diagram

Wiring diagram

Refer to dtc p0010

Camshaft position ”a” –timing over

Dtc p0011 camshaft position ”a” –timing over– advanced or system performance (bank 1) Dtc p0012 camshaft position ”a” –timing over– retarded (bank 1) ...

Inspection procedure

Hint Advanced timing over (valve timing is out of specified range) P0011 Retarded timing over (valve timing is out of specified range) P0012 If dtc p0011 or p0012 ...

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