Lexus IS250 · Service Manual ENGINE

P0365

Diagnostic trouble codes

DESCRIPTION

The exhaust camshaft's Variable Valve Timing (VVT) sensor (G signal) consists of a magnet and MRE element.
The exhaust camshaft has a sensor plate with 3 teeth on its outer circumference.
When the exhaust camshaft rotates, changes occur in the air gaps between the 3 teeth and pickup coil, which affects the magnet. As a result, the resistance of the MRE material fluctuates. The VVT sensor converts the exhaust camshaft rotation data to pulse signals, and uses the pulse signals to determine the camshaft angle, which it sends to the ECM. Then the ECM 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
P0365
P0390
  1. Input voltage to ECM remains 0.3 V or less, or 4.7 V or higher for more than 5 seconds, when 2 or more seconds have elapsed after turning engine switch on (IG)
    (1 trip detection logic)
  2. No VVT sensor signal to ECM during cranking
    (1 trip detection logic)
  1. Open or short in VVT sensor for exhaust camshaft circuit
  2. VVT sensor for exhaust camshaft
  3. Exhaust camshaft
  4. Jumped tooth of timing chain
  5. ECM
P0367
P0392
 Output voltage of VVT sensor 0.3 V or less for 5 seconds
(1 trip detection logic)
  1. Open or short in VVT sensor for exhaust camshaft circuit
  2. VVT sensor for exhaust camshaft
  3. Exhaust camshaft
  4. Jumped tooth of timing chain
  5. ECM
P0368
P0393
 Output voltage of VVT sensor 4.7 V or more for 5 seconds
(1 trip detection logic)
  1. Open or short in VVT sensor for exhaust camshaft circuit
  2. VVT sensor for exhaust camshaft
  3. Exhaust camshaft
  4. Jumped tooth of timing chain
  5. ECM

  1. G035795E17
    Reference: Inspection using an oscilloscope

    HINT:
    1. The correct waveform is shown.
    2. EV1+ and EV2+ stand for the VVT sensor signal, and NE+ stands for the CKP sensor signal.
      Item
      		 Content
      Terminal
      		 NE+ - NE-
      EV1+ - EV1-
      EV2+ - EV2-
      Equipment Setting
      		 5 V/DIV.
      20 ms./DIV.
      Condition
      		 Cranking or idling


WIRING DIAGRAM

Refer to DTC P0335 (Click here).

INSPECTION PROCEDURE

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 (Click here).

1. CHECK ECM TERMINAL VOLTAGE

  1. A107709E19
    Inspect the ECM using an oscilloscope.

    1. While the engine is idling, check the waveform between the terminals of the ECM connector.

      Standard:
      Tester Connection
      		 Specified Condition
      EV1+ (E5-19) - EV1- (E5-18)
      		 Correct waveform shown
      EV2+ (E6-13) - EV2- (E6-12)
      		 Correct waveform shown
      NE+ (E3-32) - NE- (E3-31)
      		 Correct waveform shown



OK
REPLACE ECM
NG


2. CHECK HARNESS AND CONNECTOR (SENSOR POWER SOURCE)

  1. A107149E13
    Disconnect the E25 or E34 VVT sensor connector.

  1. Measure the voltage of the wire harness side connector.

    Standard voltage:
    Tester Connection
    		 Specified Condition
    VC2 (E25-3) - Body ground
    		 4.5 to 5.0 V
    VC2 (E34-3) - Body ground
    		 4.5 to 5.0 V

  1. Reconnect the VVT sensor connector.



 NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


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

  1. A108932E07
    Disconnect the E25 or E34 VVT sensor connector.

  1. Disconnect the E5 or E6 ECM connector.

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

    Standard resistance (Check for open):
    Tester Connection
    		 Specified Condition
    EX+ (E25-1) - EV1+ (E5-19)
    		 Below 1 Ω
    EX- (E25-2) - EV1- (E5-18)
    		 Below 1 Ω
    EX+ (E34-1) - EV2+ (E6-13)
    		 Below 1 Ω
    EX- (E34-2) - EV2- (E6-12)
    		 Below 1 Ω

    Standard resistance (Check for short):
    Tester Connection
    		 Specified Condition
    EX+ (E25-1) or EV1+ (E5-19) - Body ground
    		 10 kΩ or higher
    EX- (E25-2) or EV1- (E5-18) - Body ground
    		 10 kΩ or higher
    EX+ (E34-1) or EV2+ (E6-13) - Body ground
    		 10 kΩ or higher
    EX- (E34-2) or EV2- (E6-12) - Body ground
    		 10 kΩ or higher

  1. Reconnect the VVT sensor connector.

  1. Reconnect the ECM connector.



 NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4. CHECK VVT SENSOR FOR EXHAUST CAMSHAFT (SENSOR INSTALLATION)
BR03795E18

  1. Check the VVT sensor installation.

    OK:
    Sensor is installed correctly.



 NG
REPAIR OR REPLACE VVT SENSOR
OK


5. CHECK EXHAUST CAMSHAFT

  1. Check the teeth of the camshaft.



 NG
REPLACE EXHAUST CAMSHAFT
OK

REPLACE VVT SENSOR


← P0351P0420 →