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DI-81
DIAGNOSTICS - ENGINE (1GR-FE)
DIDT6-01
DTC P0016 Crankshaft Position - Camshaft Position
Correlation (Bank 1 Sensor A)
DTC P0018 Crankshaft Position - Camshaft Position
Correlation (Bank 2 Sensor A)
CIRCUIT DESCRIPTION
The crankshaft position sensor (CKP) system consists of a crankshaft position sensor plate and a pick-up
coil.
The sensor plate has 34 teeth and is installed on the crankshaft. The pick-up coil is made of an iron core
and magnet. The sensor plate rotates and as each tooth passes through the pick-up coil, a pulse signal is
created. The pick-up coil generates 34 signals for each engine revolution. Based on these signals, the ECM
calculates the crankshaft position and engine RPM. Using these calculations, the fuel injection time and igni-
tion timing are controlled.
DTC No. DTC Detection Condition Trouble Area
Deviation in crankshaft position sensor signal and VVT sensor
P0016 S Mechanical system (Jumped tooth of timing chain, chain
1 signal (2 trip detection logic)
stretched)
t t h d)
Deviation in crankshaft position sensor signal and VVT sensor
P0018 S ECM
2 signal (2 trip detection logic)
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 cam-
shaft. 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
valve as "VVT learned 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 learned 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 22_CA or more than 47_CA.
(b) Above condition continues for more than 18 seconds.
DI-82
DIAGNOSTICS - ENGINE (1GR-FE)
MONITOR STRATEGY
Deviation in crankshaft position sensor signal
P0016
and camshaft position sensor signal (Bank 1)
Related DTCs
R l t d DTC
Deviation in crankshaft position sensor signal
P0018
and camshaft position sensor signal (Bank 2)
Required sensors/components
R i d / t Crankshaft
C k h ft position sensor, Camshaft position sensor
iti C h ft iti
Frequency of operation Once per drive cycle
Duration 60 sec.
MIL operation 2 drive cycles
Sequence of operation None
TYPICAL ENABLING CONDITIONS
Specification
Item
It
Minimum Maximum
The monitor will run whenever this DTC is
See page DI-18
not present
Engine RPM 500 rpm 1,000 rpm
TYPICAL MALFUNCTION THRESHOLDS
Detection Criteria Threshold
One of the following condition is met Condition (a) or (b)
(a) VVT learning value at maximum retarded valve timing Less than 22.5_CA (Crankshaft angle)
(b) VVT learning value at maximum retarded valve timing More than 45.2_CA (Crankshaft angle)
DI-83
DIAGNOSTICS - ENGINE (1GR-FE)
INSPECTION PROCEDURE
HINT:
S If DTC P0016 is displayed, check left bank VVT sensor.
S If DTC P0018 is displayed, check right bank VVT sensor.
S Read freeze frame data using hand-held tester. Because freeze frame records the engine conditions
when the malfunction is detected. When troubleshooting, it is useful for determining whether the ve-
hicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc.
at the time of the malfunction.
1 Check valve timing (Check for loose and jumping teeth of timing chain) (See
page EM-44).
NG Adjust valve timing (Repair or replace timing
chain).
OK
Replace ECM (See page SF-66).
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