RX400h · Service Manual ENGINE

P0340 No VVT sensor signal to ECM during cranking.(1 trip detection logic) No VVT sensor signal to ECMwith engine...

Diagnostic trouble codes

DESCRIPTION

The intake camshaft's Variable Valve Timing (VVT) sensor (G signal) consists of a magnet and MRE element.
The VVT camshaft drive 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 pickup coil, which affects the magnet. As a result, the resistance of the MRE material fluctuates. The VVT sensor converts the gear rotation data to pulse signals, and uses the pulse signals to determine the camshaft angle, which it sends to the ECM. Then the ECM (Included in HV Control ECU) uses this data to control fuel injection time and injection timing.
The crankshaft angle sensor plate has 34 teeth. The pickup coil generates 34 signals for each engine revolution. Based the G signal and actual crankshaft angle, the ECM detects the normal crankshaft angle. Also, based on the NE signal, the ECM detects the engine speed.
DTC No.
 DTC Detection Condition
 Trouble Area
P0340
P0345
  1. No VVT sensor signal to ECM during cranking.
    (1 trip detection logic)
  2. No VVT sensor signal to ECMwith engine speed 600 rpm or more
    (1 trip detection logic)
  1. Open or short in VVT sensor
  2. VVT sensor
  3. Camshaft timing gear
  4. Jumped tooth of timing belt
  5. HV Control ECU
P0341
 While crankshaft rotates twice, VVT sensor signal is input to ECM 12 times or more.
(1 trip detection logic)
  1. Open or short in VVT sensor
  2. VVT sensort
  3. Camshaft timing gear
  4. Jumped tooth of timing belt
  5. HV Control ECU
P0346
 While crankshaft rotates twice, VVT sensor signal is input to ECM 5 times or more.
(1 trip detection logic)
  1. Open or short in VVT sensor
  2. VVT sensort
  3. Camshaft timing gear
  4. Jumped tooth of timing belt
  5. HV Control ECU
Reference: Inspection using an oscilloscope
A110929E01

HINT:
  1. The correct waveform is shown.
  2. VV1+ and VV2+ stand for the VVT sensor signal, and NE+ stands for the CKP sensor signal.

Item
 Content
Terminals
 NE+ - NE-
VV1+ - NE-
VV2+ - NE-
Equipment Settings
 5 V/Division, 20 ms/Division
Conditions
Cranking or idling

WIRING DIAGRAM

Refer to DTC P0335 (Click here).

INSPECTION PROCEDURE

HINT:
Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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. CHECK ECU TERMINAL VOLTAGE (VV1+, VV2+, NE+ AND NE- TERMINALS)

  1. A110930E03
    Inspect the HV Control ECU using an oscilloscope.

    1. While the engine is idling, check the waveform between the terminals of the HV Control ECU connector.

      Standard:
      Tester Connection
      		 Specified Condition
      VV1+ (H32-27) - NE- (H32-24)
      		 Correct waveform shown
      VV2+ (H32-26) - NE- (H32-24)
      		 Correct waveform shown
      NE+ (H32-25) - NE- (H32-24)
      		 Correct waveform shown



NG
REPLACE VVT SENSOR
OK


2. CHECK VVT SENSOR (SENSOR RESISTANCE)

  1. A064984E24
    Disconnect the V4 or V5 VVT sensor connector.

  1. Measure the resistance between the terminals of the sensor.

    Standard resistance:
    Tester Connection
    		 Specified Condition
    1 - 2
    		 835 to 1,400 Ω at cold
    1 - 2
    		 1,060 to 1,645 Ω at hot

  1. Reconnect the VVT sensor connector.

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



 NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


3. CHECK HARNESS AND CONNECTOR (VVT SENSOR - HV CONTROL ECU)

  1. A110907E03
    Disconnect the V4 or V5 VVT sensor connector.

  1. Disconnect the H32 HV Control ECU connector.

  1. Measure the resistance between the terminals of the VVT sensor and HV Control ECU.

    Standard resistance (Check for open):
    Tester Connection
    		 Specified Condition
    VVT sensor (V5-1) - VV1+ (H32-27)
    		 Below 1 Ω
    VVT sensor (V5-2) - NE- (H32-24)
    		 Below 1 Ω
    VVT sensor (V4-1) - VV2+ (H32-26)
    		 Below 1 Ω
    VVT sensor (V4-2) - NE- (H32-24)
    		 Below 1 Ω

    Standard resistance (Check for short):
    Tester Connection
    		 Specified Condition
    VVT sensor (V5-1) or VV1+ (H32-27) - Body ground
    		 10 kΩ or higher
    VVT sensor (V5-2) or NE- (H32-24) - Body ground
    		 10 kΩ or higher
    VVT sensor (V4-1) or VV2+ (H32-26) - Body ground
    		 10 kΩ or higher
    VVT sensor (V4-2) or NE- (H32-24) - Body ground
    		 10 kΩ or higher

  1. Reconnect the VVT sensor connector.

  1. Reconnect the HV Control ECU connector.



 NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


4. CHECK SENSOR INSTALLATION (VVT SENSOR)

  1. BR03795E17
    Check the CKP sensor installation.

    OK:
    Sensor is installed correctly.



 NG
TIGHTEN SENSOR
OK


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

  1. Check the teeth of the signal plate.

    OK:
    Sensor plate teeth do not have any cracks or deformation.



 NG
REPLACE CAMSHAFT TIMING GEAR ASSEMBLY
OK

REPLACE HV CONTROL ECU


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