Toyota Tundra. Manual — part 1373

The Variable Valve Timing (VVT) sensor consists of a magnet, iron core and pickup coil. The VVT signal plate
has 3 teeth on its outer circumference and is installed on the camshaft timing pulley. When the camshafts
rotates, changes occur on the camshaft protrusions and the pickup coil air gaps. These changes cause
fluctuations in the magnetic field and generate voltage in the pickup coil.

Each sensor monitors its timing rotor, which is located on the camshaft. The ECM uses the sensor to detect the
camshaft angle. The camshaft rotation synchronizes with the crankshaft rotation, and this sensor communicates
the rotation of the camshaft timing rotor as a pulse signal to the ECM. Based on the signal, the ECM controls
camshaft position.

The crankshaft angle sensor plate has 34 teeth. The pickup coil generates 34 signals for each engine revolution.
Based on a combination of the VVT signal and NE signal, the ECM detects the crankshaft angle. Then the ECM
uses this data to control fuel injection time and injection timing. Also, based on the NE signal, the ECM detects
the engine speed.

DTC DETECTION CONDITION AND TROUBLE AREA

Reference: Inspection using an oscilloscope

Fig. 129: Signal Waveforms Graph

HINT:

DTC

Code

DTC Detection Condition

Trouble Area

P0340
P0345

When either condition below is met:



No VVT sensor signal to ECM during cranking (2
trip detection logic)



No VVT sensor signal to ECM with engine speed
600 RPM or more

(1 trip detection logic)



Open or short in VVT sensor
circuit



VVT sensor



Camshaft timing gear for
intake camshaft



Timing belt has a jumped tooth



ECM

2008 Toyota Tundra

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



The correct waveform is as shown.



VV1 + and VV2+ stand for the VVT sensor signal, and NE+ stands for the CKP sensor signal.

WAVEFORM REFERENCE

MONITOR DESCRIPTION

If no signal is transmitted by the VVT sensor despite the engine revolving, the ECM interprets this as a
malfunction of the sensor.

MONITOR STRATEGY

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

All:

TYPICAL ENABLING CONDITIONS - ALL

Case 1:

TYPICAL ENABLING CONDITIONS - CASE 1

Item

Content

Terminal

NE+ - NE-

VV1+ - VV1-
VV2+ - VV2-

Equipment Setting

2 V/DIV.

20 msec./DIV.

Condition

Cranking or idling

Related DTCs

P0340: VVT sensor (for bank 1) open/short
P0340: VVT position/Crankshaft position misalignment (for bank
1)
P0345: VVT sensor (for bank 2) open/short
P0345: VVT position/Crankshaft position misalignment (for bank
2)

Required Sensors/Components
(Main)

VVT position sensor (for bank 1 and 2)

Required Sensors/Components (Sub) Crankshaft position sensor
Frequency of Operation

Continuous

Duration

5 seconds

MIL Operation

Immediate

Sequence of Operation

None

Monitor runs whenever following DTCs are not present

None

Engine speed

600 RPM or more

2008 Toyota Tundra

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

Case 2:

TYPICAL ENABLING CONDITIONS - CASE 2

TYPICAL MALFUNCTION THRESHOLDS

TYPICAL MALFUNCTION THRESHOLDS

COMPONENT OPERATING RANGE

COMPONENT OPERATING RANGE

WIRING DIAGRAM

Refer to DTC P0335 .

INSPECTION PROCEDURE

HINT:

Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as
freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in
determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the
air-fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction (see FREEZE
FRAME DATA ).

1. INSPECT VVT SENSOR (RESISTANCE)

a. Disconnect the D36 or D38 VVT sensor connector.

b. Measure the resistance according to the value (s) in the table below.

Standard resistance

STANDARD RESISTANCE SPECIFICATION

Battery voltage

8 V or higher

Starter

OFF

Ignition switch

ON

Starter

ON

Minimum battery voltage

Less than 11 V

Camshaft position signal

No signal

VVT sensor voltage

0.3 to 4.7 V

Tester Connection Condition Specified Condition

1-2

Cold

835 to 1400 ohms

1-2

Hot

1060 to 1645 ohms

2008 Toyota Tundra

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

Fig. 130: Identifying VVT Sensor Connector Terminal

NG : REPLACE VVT SENSOR (See REMOVAL )

OK : Go To Next Step

2. CHECK HARNESS AND CONNECTOR (VVT SENSOR - ECM)

a. Disconnect the D36 or D38 VVT sensor connector.

b. Disconnect the D74 ECM connector.

c. Measure the resistance according to the value (s) in the table below.

Standard resistance

STANDARD RESISTANCE SPECIFICATION

NOTE:

In the above chart, the terms "cold" and "hot" refer to the
temperature of the coils.
"Cold" means approximately -10 to 50°C (14 to 122°F).
"Hot" means approximately 50 to 100°C (122 to 212°F).

Tester Connection

Condition Specified Condition

D36-1 - D74-92 (VV1+)

Always

Below 1 ohms

D36-2 - D74-91 (VV1-)

Always

Below 1 ohms

D38-1 - D74-87 (VV2+)

Always

Below 1 ohms

D38-2 - D74-88 (VV2-)

Always

Below 1 ohms

D36-1 or D74-92 (VV1+) - Body ground Always

10 kohms or higher

D36-2 or D74-91 (VV1-) - Body ground

Always

10 kohms or higher

D38-1 or D74-87 (VV2+) - Body ground Always

10 kohms or higher

D38-2 or D74-88 (VV2-) - Body ground

Always

10 kohms or higher

2008 Toyota Tundra

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