1Gr-Fe Engine Control. Dtc P0340 Camshaft Position Sensor Circuit Malfunction

The intake camshaft's Variable Valve Timing (VVT) sensor (VV1, VV2 signal) consists of a magnet and MRE (Magnetoresistive Element).
The camshaft timing gear has a sensor plate with 3 teeth on its outer circumference. When the gear rotates, changes occur in the air gaps between the sensor plate and MRE, which affects the magnetic field. As a result, the resistance of the MRE material fluctuates. The VVT sensor converts the gear rotation data to pulse signals, uses the pulse signals to determine the camshaft angle, and sends the camshaft angle data to the ECM.
The crankshaft angle sensor rotor has 34 teeth. The pickup coil generates 34 signals for each crankshaft 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 No.	DTC Detection Condition	Trouble Area
P0340	Either condition is met: No VVT sensor signal is sent to the ECM while cranking (2 trip detection logic). There is no VVT sensor signal despite the crankshaft position sensor input being normal at an engine speed of 600 rpm or more (1 trip detection logic).	Open or short in VVT sensor (for intake side of bank 1) circuit VVT sensor (for intake side of bank 1) Camshaft timing gear assembly Timing chain for intake camshaft has jumped tooth ECM
P0345	There is no VVT sensor signal despite the crankshaft position sensor input being normal at an engine speed of 600 rpm or more (1 trip detection logic).	Open or short in VVT sensor (for intake side of bank 2) circuit VVT sensor (for intake side of bank 2) Camshaft timing gear assembly Timing chain for intake camshaft has jumped tooth ECM
P0342 P0347	Output voltage of the VVT sensor is below 0.3 V for 4 seconds (1 trip detection logic).	Open or short in VVT sensor (for intake side) circuit VVT sensor (for intake side) Camshaft timing gear assembly Timing chain for intake camshaft has jumped tooth ECM
P0343 P0348	Output voltage of the VVT sensor is higher than 4.7 V for 4 seconds (1 trip detection logic).	Open or short in VVT sensor (for intake side) circuit VVT sensor (for intake side) Camshaft timing gear assembly Timing chain for intake camshaft has jumped tooth ECM

Reference: Inspection using an oscilloscope
HINT:
1. The correct waveforms are as shown.
2. VV1 and VV2 are the VVT sensor signals, and NE is the crankshaft position sensor signal.
Item
Content
Terminal
NE+ - NE-
VV1+ - VV1-
VV2+ - VV2-
Equipment Setting
5 V/DIV.
20 msec./DIV.
Condition
Cranking or idling

MONITOR DESCRIPTION

If no signal is transmitted by the VVT sensor despite the camshaft revolving, or the rotations of the camshaft and crankshaft are not synchronized, the ECM interprets this as a malfunction of the VVT sensor.

WIRING DIAGRAM

Land Cruiser. Urj200, 202 Grj200 Vdj200.1Gr-Fe Engine Control.Sfi System.
Dtc
P0340 Camshaft Position Sensor Circuit Malfunction

INSPECTION PROCEDURE

HINT:

Read freeze frame data using the GTS. 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.
Bank 1 refers to the bank that includes the No. 1 cylinder*.
*: The No. 1 cylinder is the cylinder which is farthest from the transmission.
Bank 2 refers to the bank that does not include the No. 1 cylinder.

1.CHECK TERMINAL VOLTAGE (SENSOR POWER SOURCE)

Disconnect the VVT sensor connector.

Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
Switch Condition
Specified Condition
C26-3 (VC) - Body ground
Ignition switch ON
4.5 to 5.0 V
C25-3 (VC) - Body ground
Ignition switch ON
4.5 to 5.0 V
Text in Illustration
*A
for Bank 1
*B
for Bank 2
*a
Front view of wire harness connector
(to VVT Sensor)

Text in Illustration
*A	for Bank 1
*B	for Bank 2
*a	Front view of wire harness connector (to VVT Sensor)

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

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

Disconnect the VVT sensor connector.

Disconnect the ECM connector.

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

Standard Resistance:

for LHD
Tester Connection	Condition	Specified Condition
C26-1 (VVR+) - C45-90 (VV1+)	Always	Below 1 Ω
C26-2 (VVR-) - C45-89 (VV1-)	Always	Below 1 Ω
C25-1 (VVL+) - C45-87 (VV2+)	Always	Below 1 Ω
C25-2 (VVL-) - C45-88 (VV2-)	Always	Below 1 Ω
C26-1 (VVR+) or C45-90 (VV1+) - Body ground	Always	10 kΩ or higher
C26-2 (VVR-) or C45-89 (VV1-) - Body ground	Always	10 kΩ or higher
C25-1 (VVL+) or C45-87 (VV2+) - Body ground	Always	10 kΩ or higher
C25-2 (VVL-) or C45-88 (VV2-) - Body ground	Always	10 kΩ or higher

for RHD
Tester Connection	Condition	Specified Condition
C26-1 (VVR+) - C46-90 (VV1+)	Always	Below 1 Ω
C26-2 (VVR-) - C46-89 (VV1-)	Always	Below 1 Ω
C25-1 (VVL+) - C46-87 (VV2+)	Always	Below 1 Ω
C25-2 (VVL-) - C46-88 (VV2-)	Always	Below 1 Ω
C26-1 (VVR+) or C46-90 (VV1+) - Body ground	Always	10 kΩ or higher
C26-2 (VVR-) or C46-89 (VV1-) - Body ground	Always	10 kΩ or higher
C25-1 (VVL+) or C46-87 (VV2+) - Body ground	Always	10 kΩ or higher
C25-2 (VVL-) or C46-88 (VV2-) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.CHECK SENSOR INSTALLATION (VVT SENSOR FOR INTAKE CAMSHAFT)

Check the VVT sensor installation.
OK:
Sensor is installed correctly.

SECURELY REINSTALL SENSOR (Click here)

OK

4.CHECK CAMSHAFT TIMING GEAR ASSEMBLY (TEETH OF PLATE)

Check the teeth of the signal plate.
OK:
Sensor plate teeth do not have any cracks or deformation.

REPLACE CAMSHAFT TIMING GEAR ASSEMBLY (Click here)

OK

5.REPLACE VVT SENSOR

Replace the VVT sensor (Click here).

NEXT

6.CHECK WHETHER DTC OUTPUT RECURS (DTC P0340, P0342, P0343, P0345, P0347 OR P0348)

Connect the GTS to the DLC3.

Turn the ignition switch to ON.

Turn the GTS on.

Clear the DTCs (Click here).

Start the engine.

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

Read the DTCs.

Result
Result
Proceed to
No DTC is output
A
P0340, P0342, P0343, P0345, P0347 or P0348 is output
B
HINT:
If the engine does not start, replace the ECM.

Result
Result	Proceed to
No DTC is output	A
P0340, P0342, P0343, P0345, P0347 or P0348 is output	B

REPLACE ECM (Click here)

END

Item	Content
Terminal	NE+ - NE- VV1+ - VV1- VV2+ - VV2-
Equipment Setting	5 V/DIV. 20 msec./DIV.
Condition	Cranking or idling

Tester Connection	Switch Condition	Specified Condition
C26-3 (VC) - Body ground	Ignition switch ON	4.5 to 5.0 V
C25-3 (VC) - Body ground	Ignition switch ON	4.5 to 5.0 V