Toyota Tundra. Manual — part 1330

The VVT system includes the ECM, Oil Control Valve (OCV) and VVT controller. The ECM sends a target
duty-cycle control signal to the OCV. This control signal regulates the oil pressure supplied to the VVT
controller. Camshaft timing control is performed according to engine operating conditions such as the intake air
volume, throttle valve position and engine coolant temperature. The ECM controls the OCV, based on the
signals transmitted by several sensors. The VVT controller regulates the intake camshaft angle using oil
pressure through the OCV. As a result, the relative positions of the camshaft and crankshaft are optimized, the
engine torque and fuel economy improve, and the exhaust emissions decrease under overall driving conditions.
The ECM detects the actual intake valve timing using signals from the camshaft and crankshaft position
sensors, and performs feedback control. This is how the target intake valve timing is verified by the ECM.

Fig. 38: DTC P0011 Camshaft Position "A" - Timing Over-Advanced Or System Performance (Bank 1) -
Communication Diagram

DTC DETECTION CONDITION AND TROUBLE AREA

DTC

Code

DTC Detection Condition

Trouble Area

P0011
P0021

Valve timing is not adjusted in valve timing advance range
(1 trip detection logic)



Valve timing



OCV for intake camshaft



OCV filter



Intake camshaft timing gear
assembly

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra

MONITOR DESCRIPTION

The ECM optimizes the intake valve timing using the VVT (Variable Valve Timing) system to control the
intake 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 regulates the oil pressure
supplied to the VVT controller. The VVT controller can advance or retard the intake camshaft. If the difference
between the target and actual intake valve timings is large, and changes in the actual intake valve timing are
small, the ECM interprets this as the VVT controller stuck malfunction and sets a DTC.

Example:

A DTC is set when the following conditions 1, 2 and 3 are met:

1. The difference between the target and actual intake valve timing is more than 5°CA (Crankshaft Angle)

and the condition continues for more than 4.5 seconds.

2. It takes 5 seconds or more to change the valve timing by 5°CA.

3. After above conditions 1 and 2 are met, the OCV is forcibly activated 63 times or more. DTC P0011 and

P0021 (Advanced Cam Timing) are subject to 1 trip detection logic.

DTC P0012 and P0022 (Retarded Cam Timing) are subject to 2 trip detection logic.

These DTCs indicate that the VVT controller cannot operate properly due to OCV malfunctions or the presence
of foreign objects in the OCV.

The monitor will run if all of the following conditions are met:



The engine is warm (the engine coolant temperature is 75°C [167°F] or more).



The vehicle has been driven at more than 64 km/h (40 mph) for 3 minutes.



The engine has idled for 3 minutes.

MONITOR STRATEGY

MONITOR STRATEGY



ECM

P0012
P0022

Valve timing is not adjusted in valve timing retard range (2
trip detection logic)



Valve timing



OCV for intake camshaft



OCV filter



Intake camshaft timing gear
assembly



ECM

Related DTCs

P0011: Advanced camshaft timing (bank 1)
P0012: Retarded camshaft timing (bank 1)
P0021: Advanced camshaft timing (bank 2)

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra

TYPICAL ENABLING CONDITIONS

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

Advanced camshaft timing:

TYPICAL MALFUNCTION THRESHOLDS

Retard camshaft timing:

TYPICAL MALFUNCTION THRESHOLDS

If the difference between the target and actual camshaft timings is greater than the specified value, the ECM
operates the VVT actuator.

Then, the ECM monitors the camshaft timing change for 10 seconds.

WIRING DIAGRAM

Refer to DTC P0010 .

INSPECTION PROCEDURE

P0022: Retarded camshaft timing (bank 2)

Required Sensors/Components
(Main)

VVT OCV and VVT Actuator

Required Sensors/Components
(Related)

Crankshaft position sensor, Camshaft position sensor and Engine
coolant temperature sensor

Frequency of Operation

Once per driving cycle

Duration

Within 10 seconds

MIL Operation

Advanced camshaft timing: Immediate
Retarded camshaft timing: 2 driving cycles

Sequence of Operation

None

Monitor runs whenever following DTCs not present

P0102-P0103 (MAF meter)
P0115 - P0118 (ECT sensor)
P0125 (Insufficient ECT for Closed Loop)
P0335 (CKP sensor)
P0351 - P0358 (Igniter)

Battery voltage

11V or higher

Engine RPM

400 to 4000 RPM

ECT

75 to 100°C (167 to 212°F)

Valve timing

No change at advanced valve timing

Valve timing

No change at retarded valve timing

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra

HINT:

DTC P0011, P0012, P0021 or P0022 may be set when foreign objects in the engine oil are caught in some parts
of the system. The DTC will remain set even if the system returns to normal after a short time.

Foreign objects are filtered out by the oil filter.

HINT:

INSPECTION CHART



If DTC P0011 or P0012 is displayed, check the left bank VVT system for intake camshaft circuit (for
bank 1).



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



If DTC P0021 or P0022 is displayed, check the right bank VVT system for intake camshaft circuit (for
bank 2).



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



Read freeze frame data using the Techstream. Freeze frame data records the engine condition when
malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was
moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other
data from the time the malfunction occurred.

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0011, P0012, P0021 OR P0022)

a. Connect the Techstream to the DLC3.

b. Turn the ignition switch to ON and turn the Techstream ON.

c. Enter the following menus: Powertrain/Engine and ECT/Trouble Codes.

d. Read DTCs.

Result

RESULT REFERENCE

HINT:

If any DTCs other than P0011, P0012, P0021 or P0022 are output, troubleshoot those DTCs first.

B : GO TO DTC CHART (See DIAGNOSTIC TROUBLE CODE CHART )

Abnormal

bank

Advanced timing over (Valve timing is out

of specified range)

Retarded timing over (Valve timing is out

of specified range)

Bank 1

P0011

P0012

Bank 2

P0021

P0022

Result

Proceed To

P0011, P0012, P0021 or P0022 is output

A

P0011, P0012, P0021 or P0022 and other DTCs are output

B

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra