Toyota Sequoia (2005). Manual - part 70

A02852

A23658

–

DIAGNOSTICS

ENGINE

DI–83

277

5

Check VVT controller assembly.

PREPARATION:
(a)

Remove the timing belt (See page 

EM–16

).

(b)

Remove the cylinder head cover.

(c)

Remove the OCV (See page 

SF–46

).

(d)

Drain the oil in the VVT controller assembly 
(See page 

EM–36

).

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 

DI–43

).

(b)

Perform simulation test.

CHECK:
Check whether or not DTC P0011, P0012, P0021 or P0022 is stored (See page 

DI–43

).

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.

–

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

–

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

i d

/

t

C

k h ft

iti

C

h ft

iti

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 

DI–18

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