Toyota Celica 2005 Repair Manual page 557

DI−358
DTC P0016
CIRCUIT DESCRIPTION
Refer to P0335 on page DI−477.
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 is idling. The ECM closes the OCV to retard the cam. The ECM stores this value as 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) VVT learning value is less than 19°CA (crankshaft angle), or more than 41°CA.
(b) 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 RPM
TYPICAL MALFUNCTION THRESHOLDS
Detection Criteria
Duration that either of the following conditions 1 or 2 is met:
1. VVT angle when camshaft is retarded maximum
2. VVT angle when camshaft is retarded maximum
WIRING DIAGRAM
2005 CELICA (RM1131U)
DIAGNOSTICS
Crankshaft Position − Camshaft Position
Correlation (Bank 1 Sensor A)
DTC Detecting Condition
P0016
Crankshaft position sensor, Camshaft position sensor
Once per driving cycle
60 sec.
2 driving cycles
None
Minimum
600 rpm
− ENGINE (2ZZ−GE)
S Mechanical system (Timing chain has a jumped tooth, chain
is stretched)
S ECM
Deviation in crankshaft position sensor signal
and camshaft position sensor signal (Bank 1)
Specification
See page DI−295
Threshold
18 sec. or more
Less than 19_CA
More than 41_CA
556
Trouble Area
Maximum
1,400 rpm
DIC76−02