Toyota Sequoia (2005). Manual - part 69

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DIAGNOSTICS

ENGINE

DI–79

273

DTC

P0011

Camshaft Position ”A” –Timing Over– 
Actuator or System Performance (Bank 1)

DTC

P0012

Camshaft Position ”A” –Timing Over– 
Retarded (Bank 1)

DTC

P0021

Camshaft Position ”A” –Timing Over– 
Actuator or System Performance (Bank 2)

DTC

P0022

Camshaft Position ”A” –Timing Over– 
Retarded (Bank 2)

CIRCUIT DESCRIPTION

Refer to DTCs P0010 on page 

DI–73

.

DTC No.

DTC Detecting Condition

Trouble Area

P0011

P0021

Advanced cam timing:

After engine is warmed up and engine speed is at 400 to 

4,000 rpm, condition (a) continues. (1 trip detection logic)

(a) Valve timing does not change from current valve timing

Valve timing

OCV

P0012

P0022

Retarded cam timing:

After engine is warmed up and engine speed is at 400 to 

4,000 rpm, condition (a) continues. (2 trip detection logic)

(a) Valve timing does not change from current valve timing

OCV

VVT controller assembly

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.
Example:
A DTC will set if: 1) the difference between the target and actual valve timing is more than 5 degrees of the
crankshaft angle (CA) and the condition continues for more than 4.5 sec.; or 2) the OCV is forcibly activated
63 times or more.
Advanced cam DTCs are subject to ”1 trip” detection logic.
Retarded cam DTCs are subject to ”2 trip” detection logic.

DIAON–02

DI–80

–

DIAGNOSTICS

ENGINE

274

MONITOR STRATEGY

P0011

VVT system advance (Bank 1)

R l t d DTC

P0012

VVT system retard (Bank 1)

Related DTCs

P0021

VVT system advance (Bank 2)

P0022

VVT system retard (Bank 2)

Main sensors/components

Camshaft position sensor

Required sensors/components

Related sensors/components

Engine coolant temperature sensor,
Crankshaft position sensor

Frequency of operation

Once per drive cycle

Duration

10 sec.

MIL operation

P0011, P0021: Immediate
P0012, P0022: 2 driving cycles

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

It

Specification

Item

Minimum

Maximum

The monitor will run whenever these
DTCs are not present

See page 

DI–18

Battery voltage

11 V

–

Throttle position learning

Completed

Engine RPM

400 rpm

4,000 rpm

Engine coolant temperature

75



C (167



F)

100



C (212



F)

TYPICAL MALFUNCTION THRESHOLDS

Detection Criteria

Threshold

Deviation of valve timing

More than 5



CA

OCV activation

63 times or more

Response of valve timing

1 sec./1



CA or more

WIRING DIAGRAM

Refer to DTCs P0010 on page 

DI–73

.

INSPECTION PROCEDURE

HINT:

Bank 1 refers to bank that includes cylinder No. 1.

Bank 2 refers to bank that does not include cylinder No. 1.

If DTC P0011, P0012 is displayed, check the bank 1 VVT system.

If DTC P0021, P0022 is displayed, check the bank 2 VVT system.

Read freeze frame data using the hand–held tester. Freeze frame data records the engine conditions
when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle
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.

–

DIAGNOSTICS

ENGINE

DI–81

275

1

Check operation of OCV.

PREPARATION:
(a)

Connect the hand–held tester to the DLC3.

(b)

Start the engine and warm it up.

(c)

Turn the ignition switch to ON and turn the hand–held tester ON.

CHECK:
(a)

Select the item: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / VVT CTRL B1 or VVT CTRL B2.

(b)

Using the hand–held tester, operate the OCV and check the engine speed.

OK:

Standard:

Tester Operation

Specified Condition

OCV is OFF

Normal engine speed

OCV is ON

Rough idle or engine stall

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

2

Check valve timing (See page 

EM–23

).

NG

Adjust valve timing.

OK

A02397

OCV Signal Waveform

200 msec./Division

5 V/
Division

GND

(A)

(A)

(A)

B17414

ECM Connector

E6

OC1+

OC1–

OC2+

OC2–

E1

B12806

Ohmmeter

DI–82

–

DIAGNOSTICS

ENGINE

276

3

Check voltage between terminals OCV+ and OCV– of ECM connector.

CHECK:
(a)

Inspection using the oscilloscope.

(b)

During idling, check the waveform between the specified
terminals of the E6 ECM connector.

HINT:
The waveform frequency (A) is lengthened as the engine speed
becomes higher.
OK:

Standard:
The correct waveform is as shown.

NG

Check and replace ECM (See page 

IN–35

).

OK

4

Check OCV.

PREPARATION:
(a)

Remove the V–bank cover.

(b)

Remove the air cleaner inlet and intake air connector.

(c)

Disconnect the oil control valve connector.

CHECK:
(a)

Using an Ohmmeter, measure the resistance between
the terminals.
Resistance: 6.9 – 7.9 

Ω

 at 20

°

C (68

°

F)

NG

Replace OCV, and then go to step 6.

OK