P0390
1UR-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 VVT sensor system consists of a timing rotor (installed on each camshaft) and Magnetic Resistance Element (MRE) type VVT sensor. The timing rotor (camshaft) has 3 protrusions. When it rotates, the magnetic vector (direction of magnetic field) applied to the VVT sensor's MRE varies, which causes its resistance to vary. This varying resistance is converted to voltage, and then modified into a rectangular waveform with Hi (approximately 4 V) and Lo (approximately 1 V) outputs. As a result, the actual camshaft's position is detected and the position is output to the ECM.
Reference: Inspection using an oscilloscope
HINT:
- The correct waveform is as shown.
- EV1+ and EV2+ stand for the VVT sensor (for exhaust side) signal, and NE+ stands for the CKP sensor signal.
MONITOR DESCRIPTION
If no signal is transmitted by the VVT sensor despite the engine revolving, 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: VVT Sensor Range Check (Rationality)
P0365, P0390, P0367, P0392, P0368, P0393: VVT Sensor Range Check (Fluctuating, Low voltage, High voltage)
TYPICAL MALFUNCTION THRESHOLDS
P0365 and P0390: VVT Sensor Range Check (Fluctuating)
P0367 and P0392: VVT Sensor Range Check (Low voltage)
P0368 and P0393: VVT Sensor Range Check (High voltage)
P0365 and P0390: VVT Sensor Range Check (Rationality)
COMPONENT OPERATING RANGE
P0365 and P0390: VVT Sensor Range Check (Rationality)
Others:
WIRING DIAGRAM
INSPECTION PROCEDURE
Read freeze frame data using the 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.
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 VVT SENSOR (SENSOR POWER SOURCE)
(a) Disconnect the VVT sensor connector.
(b) Turn the engine switch on (IG).
(c) Measure the voltage according to the value(s) in the table below.
Standard voltage:
(d) Reconnect the VVT sensor connector.
NG -- CHECK HARNESS AND CONNECTOR (VVT SENSOR FOR EXHAUST SIDE - ECM)
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (VVT SENSOR FOR EXHAUST SIDE - ECM)
(a) Disconnect the VVT sensor connector.
(b) Disconnect the 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 and ECM connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
4. CHECK SENSOR INSTALLATION (VVT SENSOR FOR EXHAUST SIDE)
(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 signal plate.
OK:
Signal plate teeth do not have any cracks or deformation.
NG -- REPLACE EXHAUST CAMSHAFT
OK -- Continue to next step.
6. REPLACE VVT SENSOR FOR EXHAUST SIDE
(a) Replace the VVT sensor for exhaust side Components.
NEXT -- Continue to next step.
7. CHECK WHETHER DTC OUTPUT RECURS
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream ON.
(d) Clear DTCs DTC Check / Clear.
(e) Start the engine.
(f) Enter the following menus: Powertrain / Engine / Trouble Codes.
(g) Read DTCs.
Result:
HINT: If the engine does not start, replace the ECM.
B -- REPLACE ECM
A -- END
8. CHECK HARNESS AND CONNECTOR (VVT SENSOR FOR EXHAUST SIDE - ECM)
(a) Disconnect the VVT sensor connector for exhaust side.
(b) Disconnect the 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 and ECM connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE ECM