Last Modified: 4-30-2014 6.6 C Doc ID: RM000000YE1007X
Model Year: 2006 Model: LX470 Prod Date Range: [05/2005 -           ]
Title: 2UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0340,P0341,P0345,P0346; Camshaft Position Sensor Circuit Malfunction; 2006 MY LX470 [05/2005 -        ]

DTC

P0340

Camshaft Position Sensor Circuit Malfunction

DTC

P0341

Camshaft Position Sensor "A" Circuit Range / Performance (Bank 1 or Single Sensor)

DTC

P0345

Camshaft Position Sensor "A" Circuit (Bank 2)

DTC

P0346

Camshaft Position Sensor "A" Circuit Range / Performance (Bank 2)

DESCRIPTION

The Variable Valve Timing (VVT) sensor consists of a magnet, iron core and pickup coil. The camshaft timing rotor has 3 teeth on its outer circumference and is installed on the intake camshaft. When the camshafts rotate, change 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 camshaft 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.

DTC No.

DTC Detection Condition

Trouble Area

P0340

P0345
  • 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
  • intake camshaft
  • Timing belt has a jumped tooth
  • ECM

P0341

P0346

While crankshaft rotates twice, VVT sensor signal is input to ECM 12 times or more (1 trip detection logic)

Same as DTC No. P0340/P0345

HINT:

  • DTC P0340 and P0345 indicate a malfunction related to the VVT sensor (+) circuit

    (wire harness (from ECM to VVT sensor) and VVT sensor).

  • DTC P0341 and P0346 indicate a malfunction related to the VVT sensor (-) circuit

    (wire harness (from ECM to VVT sensor) and VVT sensor).

  • Reference: Inspect using an oscilloscope.

    During cranking or idling, check the waveform of the ECM connector.

Tester Connection

Specified Condition

E6-25 (VV1+) - E6-24 (VV1-)

Correct waveform is as shown

E6-18 (VV2+) - E6-28 (VV2-)

Correct waveform is as shown

E6-21 (NE+) - E6-20 (NE-)

Correct waveform is as shown

MONITOR DESCRIPTION

If there is no signal from the VVT sensor even though the engine is revolving, or if the rotation of the camshaft and the crankshaft is not synchronized, the ECM interprets this as a malfunction of the sensor.

This monitor runs for 10 seconds (the first 10 seconds of engine idle) after the engine is started.

MONITOR STRATEGY

Related DTCs

P0340: VVT sensor (bank 1) range check / rationality

P0341: VVT sensor (bank 1) range check / rationality

P0345: VVT sensor (bank 2) range check / rationality

P0346: VVT sensor (bank 2) range check / rationality

Required Sensors/Components (Main)

VVT sensor

Required Sensors/Components (Related)

Crankshaft position sensor

Frequency of Operation

Continuous

Duration

5 seconds

MIL Operation

P0340, P0345 case 1: 2 driving cycles

P0340, P0345 case 2, P0341, P0346: Immediate

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

All:

Monitor will run whenever these DTCs are not present

None

P0340, P0345 Case 1:

Starter

ON

Minimal battery voltage while starter ON

Less than 11 V

P0340, P0345 Case 2:

Engine RPM

600 rpm or more

Starter

OFF

Battery voltage

8 V or more

Ignition switch

ON

P0341, P0346:

Starter

After OFF to ON timing

Engine revolution

720°CA

TYPICAL MALFUNCTION THRESHOLDS

P0340, P0345 Case 1:

VVT sensor signal

No signal

P0340, P0345 Case 2:

VVT sensor signal

No signal

P0341, P0346:

VVT sensor count

12 or more / 720°CA (=Engine 2 revolutions)

COMPONENT OPERATING RANGE

VVT sensor signal input during every 720°CA

3

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:

  • If DTC P0340 and P0341 are displayed, check the left bank VVT sensor.
  • If DTC P0345 and P0346 are displayed, check the right bank VVT sensor.
  • Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, 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.

PROCEDURE

1.

INSPECT VVT SENSOR (RESISTANCE)

(a) Disconnect the C42 and C43 VVT sensor connectors.

(b) Measure the resistance of the VVT sensor.

Standard resistance:

Tester Connection

Condition

Specified Condition

1 - 2

Cold

835 to 1,400 Ω

1 - 2

Hot

1,060 to 1,645 Ω

NOTICE:

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).
NG

REPLACE VVT SENSOR

OK

2.

CHECK HARNESS AND CONNECTOR (VVT SENSOR - ECM)

(a) Check harness and connector 2006 MY LX470 [05/2005 -        ]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: ELECTRONIC CIRCUIT INSPECTION PROCEDURE .

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

CHECK SENSOR INSTALLATION (VVT SENSOR)

(a) Check the sensor installation.

OK:

Sensor is installed correctly.
NG

SECURELY REINSTALL SENSOR

OK

4.

CHECK CAMSHAFT (TOOTH)

(a) Remove the cylinder head cover 2006 MY LX470 [05/2005 -        ]; 2UZ-FE ENGINE MECHANICAL: CYLINDER HEAD: REMOVAL .

(b) Check the tooth of the camshaft.

NG

REPLACE CAMSHAFT

OK

REPLACE ECM