Toyota Tacoma manuals

Toyota Corolla Repair Manual: 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):
  1.  valve timing does not change from current valve timing
  2.  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):
  1.  valve timing does not change from current valve timing
  2.  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 dutycycle 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 ...

Other materials:

Do-it-yourself service precautions
If you perform maintenance by yourself, be sure to follow the correct procedure as given in these sections. CAUTION The engine compartment contains many mechanisms and fluids that may move suddenly, become hot, or become electrically energized. To avoid death or serious injury, observe t ...

Overhaul
1. Remove manual transmission filler plug Remove the manual transmission filler plug and gasket from the manual transmission case. 2. Remove drain (mtm) plug subassy Remove the drain (mtm) plug subassy and gasket from the manual transmission case. 3. Remove speedometer se ...

General information
There are many ecu controlled systems used in the corolla. In general, ecu controlled system are considered to be very intricate and require a high level of technical knowledge and expert skill to troubleshoot. The fact is, however, that if you proceed by inspecting the circuits one by one, ...

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