Dtc P0340 Camshaft Position Sensor Circuit Malfunction

Engine. Lexus Gs430, Gs300. Uzs190 Grs190
3Uz-Fe Engine Control System. Lexus Gs430, Gs300. Uzs190 Grs190

DESCRIPTION

MONITOR DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT VVT SENSOR (RESISTANCE)

CHECK WIRE HARNESS (VVT SENSOR - ECM)

CHECK SENSOR INSTALLATION (VVT SENSOR)

CHECK CRANKSHAFT TIMING PULLEY

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 VVT signal plate has 3 teeth on its outer circumference and is installed on the camshaft timing pulley. When the camshafts rotate, changes occur on the camshaft protrusions and in 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 the camshaft positions.

DTC No.
DTC Detection Condition
Trouble Area
P0340
P0345
  1. No VVT sensor signal to ECM during cranking (2 trip detection logic)
  2. No VVT sensor signal to ECM with engine speed 600 rpm or more (1 trip detection logic)
  1. Open or short in VVT sensor circuit
  2. VVT sensor
  3. Camshaft timing pulley
  4. Timing belt has a jumped tooth
  5. ECM
P0341
P0346
When 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:
  1. DTC P0340 and P0345 indicate a malfunction related to the VVT sensor (+) circuit
    (wire harness (from ECM to VVT sensor) and VVT sensor).
  2. DTC P0341 and P0346 indicate a malfunction related to the VVT sensor (-) circuit
    (wire harness (from ECM to VVT sensor) and VVT sensor).

  1. Lexus Gs430, Gs300. Uzs190 Grs190.3Uz-Fe Engine Control System.Sfi System. Dtc P0340 Camshaft Position Sensor Circuit Malfunction
  2. Reference: Inspection using an oscilloscope.
    During cranking or idling, check the waveform of the ECM connector.
Tester Connection
Specified Condition
VV1+ (E8-19) - VV1- (E8-18)
Correct waveform is as shown
VV2+ (E6-19) - VV2- (E6-18)
Correct waveform is as shown
NE+ (E8-32) - NE- (E8-31)
Correct waveform is as shown

MONITOR DESCRIPTION

If there is no signal from the VVT sensor even though the engine is running, 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.

WIRING DIAGRAM


Lexus Gs430, Gs300. Uzs190 Grs190.3Uz-Fe Engine Control System.Sfi System. Dtc P0340 Camshaft Position Sensor Circuit Malfunction


INSPECTION PROCEDURE

HINT:
  1. If DTC P0340 and P0341 are displayed, check the left bank VVT sensor.
  2. If DTC P0345 and P0346 are displayed, check the right bank VVT sensor.
  3. Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when a malfunction is 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.
1.INSPECT VVT SENSOR (RESISTANCE)
Lexus Gs430, Gs300. Uzs190 Grs190.3Uz-Fe Engine Control System.Sfi System. Dtc P0340 Camshaft Position Sensor Circuit Malfunction

  1. Disconnect the E15 and E34 VVT sensor connectors.

  1. 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 WIRE HARNESS (VVT SENSOR - ECM)
Lexus Gs430, Gs300. Uzs190 Grs190.3Uz-Fe Engine Control System.Sfi System. Dtc P0340 Camshaft Position Sensor Circuit Malfunction

  1. Disconnect the E15 and E34 VVT sensor connectors.

  1. Disconnect the E6 and E8 ECM connectors.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    E15-1 - E8-19 (VV1+)
    		Below 1 Ω
    E15-2 - E8-18 (VV1-)
    		Below 1 Ω
    E34-1 - E6-19 (VV2+)
    		Below 1 Ω
    E34-2 - E6-18 (VV2-)
    		Below 1 Ω
    E15-1 or E8-19 (VV1+) - Body ground
    		10 kΩ or higher
    E15-2 or E8-18 (VV1-) - Body ground
    		10 kΩ or higher
    E34-1 or E6-19 (VV2+) - Body ground
    		10 kΩ or higher
    E34-2 or E6-18 (VV2-) - Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


3.CHECK SENSOR INSTALLATION (VVT SENSOR)
Lexus Gs430, Gs300. Uzs190 Grs190.3Uz-Fe Engine Control System.Sfi System. Dtc P0340 Camshaft Position Sensor Circuit Malfunction

  1. Check the sensor installation.

    OK:
    Sensor is installed correctly.


NG
SECURELY REINSTALL SENSOR
OK


4.CHECK CRANKSHAFT TIMING PULLEY

  1. Check the teeth of the crankshaft timing pulley.

    OK:
    Timing pulley's teeth have no deformation or cracks.


NG
REPLACE CRANKSHAFT TIMING PULLEY
OK

REPLACE ECM