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Home >> Lexus >> 2011 >> IS 250 RWD V6-2.5L (4GR-FSE) >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> P Code Charts >> P0390

P0390





4GR-FSE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0365, P0367, P0368, P0390, P0392, P0393: Camshaft Position Sensor "B" Circuit (Bank 1)


DESCRIPTION

The intake camshaft's Variable Valve Timing (VVT) sensor (EV1, EV2 signals) consists of a magnet and MRE (Magneto Resistance 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 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 it to the ECM.

The crankshaft angle sensor plate has 34 teeth. The pickup coil generates 34 signals for each engine revolution. Based combination of the VVT signals 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.





- Reference: Inspection using an oscilloscope





HINT
- The correct waveform is as shown.
- EV1+ and EV2+ stand for the VVT sensor for exhaust camshaft signal, and NE+ stands for the CKP sensor signal.






MONITOR DESCRIPTION

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

When the sensor output voltage remains less than 0.3 V, or more than 4.7 V for more than 5 seconds, the ECM sets a DTC.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS

All





P0365 and P0390:





P0367, P0392, P0368 and P0393:





TYPICAL MALFUNCTION THRESHOLDS

P0365, P0390 (Verify pulse input):





P0367, P0392 (Low voltage):





P0368, P0393 (High voltage):





COMPONENT OPERATING RANGE





CONFIRMATION DRIVING PATTERN





1. Connect the Techstream to the DLC3.

2. Turn the engine switch on (IG) and turn the Techstream on.

3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure) DTC Check / Clear.

4. Turn the engine switch off and wait for 30 seconds.

5. Turn the engine switch on (IG) and turn the Techstream on [A].

6. Start the engine.

7. Idle the engine for 10 seconds or more [B].

8. Enter the following menus: Powertrain / Engine / Trouble Codes.

9. Read the pending DTC [C].

HINT
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.

10. Enter the following menus: Powertrain / Engine / Utility / All Readiness.

11. Input the DTC: P0365, P0367, P0368, P0390, P0392 or P0393.

12. Check the DTC judgment result.





HINT
- If the judgment result shows NORMAL, the system is normal.
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows INCOMPLETE or UNKNOWN, perform step [B] again.

13. Enter the following menus: Powertrain / Engine / Utility / All Readiness.

14. Check the DTC judgment result.

HINT
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows NORMAL, the system is normal.

15. If the test result is INCOMPLETE or UNKNOWN and no DTC is output, perform a universal trip and check for permanent DTCs DTC Check / Clear.

HINT
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTC is output, the system is normal.

WIRING DIAGRAM

Refer to DTC P0335 P0335.

INSPECTION PROCEDURE

HINT
Read freeze frame data using Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air/fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction Freeze Frame Data.

PROCEDURE

1. CHECK ECM TERMINAL VOLTAGE

(a) Inspect the ECM using an oscilloscope.





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

Standard:





OK -- REPLACE ECM Removal
NG -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (SENSOR POWER SOURCE)

(a) Disconnect the E25 or E34 VVT sensor connector.

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

Standard voltage:





(c) Reconnect the VVT sensor connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

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

(a) Disconnect the E25 or E34 VVT sensor connector.

(b) Disconnect the E5 or E6 ECM connector.

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

Standard resistance (Check for open):





Standard resistance (Check for short):





(d) Reconnect the VVT sensor connector.

(e) Reconnect the ECM connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

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

(a) Check the VVT sensor installation.





OK:

Sensor is installed correctly.

NG -- SECURELY REINSTALL VVT SENSOR FOR EXHAUST CAMSHAFT Installation
OK -- Continue to next step.

5. CHECK EXHAUST CAMSHAFT

(a) Check the teeth of the camshaft.

NG -- REPLACE EXHAUST CAMSHAFT Removal

OK -- REPLACE VVT SENSOR Removal
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