Toyota Corolla Quiz
Diagnostics

Circuit description

In this manual: Diagnostics
Introduction — 31Preparation — 32Service specifications — 19Diagnostics — 497Engine control system — 6Fuel — 13Emission control — 28Exhaust — 3Cooling — 13Lubrication — 7Ignition — 3Starting & charging — 13Front suspension — 12Rear suspension — 9Tire & wheel — 1Drive shaft / propeller shaft — 15Brake — 42Automatic transmission / trans — 47Clutch — 19Steering column — 9Power steering — 11Heater & air conditioner — 20Supplemental restraint system — 27Seat belt — 12Lighting — 18Wiper & washer — 9Audio & visual — 12Wiring — 1Communication system — 1Windshield/windowglass/mirror — 31Seat — 10Theft deterrent & door lock — 10Sliding roof/convertible — 8Engine hood/door — 12Exterior/interior trim — 20Vehicle control system — 1Cruise control — 5Maintenance — 8
4steps
~24min
2/5difficulty
Done 0 of 4

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 ”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
Toyota Corolla. Monitor strategy
Typical enabling conditions
Toyota Corolla. Typical enabling conditions
Typical malfunction thresholds
Toyota Corolla. Typical malfunction thresholds
Wiring diagram

Refer to dtc p0010

Test yourself

A quick Toyota Corolla quiz: every answer comes with an explanation and a link to the manual page.