Toyota Celica 2005 Repair Manual page 262

DTC P0016
CIRCUIT DESCRIPTION
Refer to DTC P0335 on page DI−178.
DTC No.
Deviation in crankshaft position sensor signal and camshaft
P0016
position sensor signal (2 trip detection logic)
MONITOR DESCRIPTION
The ECM optimizes the valve timing using the VVT (Variable Valve Timing) system to control the intake valve
camshaft. The VVT system includes the ECM, the OCV (Oil Control Valve) and the VVT controller. The ECM
sends a target duty−cycle control signal to the OCV. This control signal, sent to the OCV, regulates the oil
pressure applied to the VVT controller. The VVT controller can advance or retard the intake valve camshaft.
The ECM calibrates the valve timing of the VVT system by setting the camshaft to the maximum retard angle
when the engine speed is idling. The ECM closes the OCV to retard the cam. The ECM stores this value
as a VVT learning value (When the difference between the target valve timing and the actual valve timing
is 5 degrees or less, the ECM stores this in its memory).
If the learning value meets both of the following conditions ((a) and (b)), the ECM interprets this as a defect
in the VVT system and sets a DTC.
(a) The VVT learning value is less than 24°CA (crankshaft angle) or more than 46°CA.
(b) The above condition continues for more than 18 sec.
MONITOR STRATEGY
Related DTCs
Required sensors/components
Frequency of operation
Duration
MIL operation
Sequence of operation
TYPICAL ENABLING CONDITIONS
Item
The monitor will run whenever this DTC is
not present
Engine speed
TYPICAL MALFUNCTION THRESHOLDS
2005 CELICA (RM1131U)
DIAGNOSTICS
Crankshaft Position − Camshaft Position
Correlation (Bank 1 Sensor A)
DTC Detecting Condition
Crankshaft position sensor, Camshaft position sensor
Once per drive cycle
60 sec.
2 drive cycles
None
Minimum
600 rpm
− ENGINE (1ZZ−FE)
S Mechanical system
(Timing chain has jumped a tooth, chain is stretched)
S ECM
P0016
Specification
See page DI−3
261
Trouble Area
Deviation in crankshaft position sensor signal
and camshaft position sensor signal (Bank 1)
Maximum
1,400 rpm
DI−63
DIC6J−02