P0390

2GR-FSE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0365: Camshaft Position Sensor "B" Circuit (Bank 1)

DTC P0365 - Camshaft Position Sensor "B" Circuit (Bank 1)

DTC P0367 - Camshaft Position Sensor "B" Circuit Low Input (Bank 1)

DTC P0368 - Camshaft Position Sensor "B" Circuit High Input (Bank 1)

DTC P0390 - Camshaft Position Sensor "B" Circuit (Bank 2)

DTC P0392 - Camshaft Position Sensor "B" Circuit Low Input (Bank 2)

DTC P0393 - Camshaft Position Sensor "B" Circuit High Input (Bank 2)

DESCRIPTION

The exhaust camshaft's Variable Valve Timing (VVT) sensor consists of a magnet and MRE (Magneto Resistance 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 MRE, 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, uses the pulse signals to determine the camshaft angle, and sends it to the ECM.





- Reference: Inspection using an oscilloscope




HINT:
- The correct waveform is as shown.
- EV1+ and EV2+ stand for the VVT sensor 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 the crankshaft are not synchronized, the ECM interprets this as a malfunction of the sensor.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS

All:





Camshaft Position Sensor Range Check (Chattering, Low voltage, High voltage) P0365, P0367, P0368, P0390, P0392 and P0393:





Camshaft Position Sensor Range Check / Rationality P0365 and P0390:





TYPICAL MALFUNCTION THRESHOLDS

Camshaft Position Sensor Range Check (Chattering) P0365 and P0390:





Camshaft Position Sensor Range Check (Low voltage) P0367 and P0392 :





Camshaft Position Sensor Range Check (High voltage) P0368 and P0393 :





Camshaft Position Sensor Range Check / Rationality P0365 and P0390:





COMPONENT OPERATING RANGE





WIRING DIAGRAM





INSPECTION PROCEDURE

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 voltage:






OK -- REPLACE ECM
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 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 VVT SENSOR FOR EXHAUST CAMSHAFT (SENSOR INSTALLATION)




(a) Check the VVT sensor installation.
OK:
Sensor is installed correctly.
NG -- REPAIR OR REPLACE VVT SENSOR
OK -- Continue to next step.
5. CHECK EXHAUST CAMSHAFT
(a) Check the teeth of the camshaft.
NG -- REPLACE EXHAUST CAMSHAFT
OK -- REPLACE VVT SENSOR