Toyota Sequoia (2005). Manual — part 70
A02852
A23658
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DIAGNOSTICS
ENGINE
DI–83
277
5
Check VVT controller assembly.
PREPARATION:
(a)
Remove the timing belt (See page
(b)
Remove the cylinder head cover.
(c)
(d)
Drain the oil in the VVT controller assembly
(See page
CHECK:
Check whether the oil in VVT controller assembly is drained or
not.
OK:
Standard:
The oil in VVT controller assembly is drained.
NG
Replace VVT controller assembly, and then go
to step 6.
OK
6
Check oil control valve filter.
PREPARATION:
(a)
Remove the cylinder head cover.
(b)
Remove the camshaft bearing cap and OCV filter.
CHECK:
Check that the filter is not clogged.
OK:
The filter is not clogged.
NG
Repair or replace.
OK
DI–84
–
DIAGNOSTICS
ENGINE
278
7
Check whether or not DTC P0010, P0012, P0021 or P0022 is stored.
PREPARATION:
(a)
Clear the DTC (See page
).
(b)
Perform simulation test.
CHECK:
Check whether or not DTC P0011, P0012, P0021 or P0022 is stored (See page
OK:
Standard: DTC P0011, P0012, P0021 or P0022 is not stored.
OK
VVT system is OK.*
*: DTC P0011, P0012, P0021 or P0022 is also output when a
foreign object is detected in some parts of the system in the en-
gine oil, and then the system returns to normal in a short time.
As ECM is controlled to eject a foreign object, there is no prob-
lem on the VVT. There is also no problem on the VVT as the oil
filter should catch the foreign object in the engine oil.
NG
Replace ECM.
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DIAGNOSTICS
ENGINE
DI–85
279
DTC
P0016
Crankshaft Position – Camshaft Position
Correlation (Bank 1 Sensor A)
DTC
P0018
Crankshaft Position – Camshaft Position
Correlation (Bank 2 Sensor A)
CIRCUIT DESCRIPTION
VVT sensor (VVL or VVR signal) consist of a signal plate and pickup coil.
The VVL or VVR signal plate has 1 tooth on its outer circumference and is mounted on the intake camshafts.
When the camshafts rotate, the protrusion on the signal plate and the air gap on the pickup coil change,
causing fluctuations in the magnetic field and generating an electromotive force in the pickup coil.
The actual camshaft angle is detected by the VVT sensor and it provides feedback to the ECM to control
the intake valve timing in response to during condition.
DTC No.
DTC Detecting Condition
Trouble Area
No VVT sensor signal to ECM during cranking at 4 sec. or
more
P0016
P0018
No VVT sensor signal to ECM with 5 sec. or more engine
speed 600 rpm or more
Open or short in VVT sensor circuit
VVT sensor
ECM
P0018
While the crankshaft rotates twice, VVT sensor signal will be
input to ECM 5 times
ECM
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, 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 is idle. 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 20
°CA (Crankshaft Angle) or more than 39°CA
.
(b)
Above condition continues for more than 18 sec.
DIAOO–02
DI–86
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DIAGNOSTICS
ENGINE
280
MONITOR STRATEGY
R l t d DTC
P0016
Deviation in crankshaft position sensor signal
and camshaft position sensor signal (Bank 1)
Related DTCs
P0018
Deviation in crankshaft position sensor signal
and camshaft position sensor signal (Bank 2)
R
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C
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iti
C
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Required sensors/components
Crankshaft position sensor, Camshaft position sensor
Frequency of operation
Once per drive cycle
Duration
60 sec.
MIL operation
2 drive cycles
Sequence of operation
None
TYPICAL ENABLING CONDITIONS
It
Specification
Item
Minimum
Maximum
The monitor will run whenever this DTC is
not present
See page
Engine RPM
400 rpm
1,400 rpm
TYPICAL MALFUNCTION THRESHOLDS
Detection Criteria
Threshold
Duration that either of the following conditions 1 or 2 is met
18 sec. or more
1. VVT angle when camshaft is retarded maximum
Less than 20
CA
2. VVT angle when camshaft is retarded maximum
More than 39
CA
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