P0393
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 camshaft 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 (After starting engine)
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 (After starting engine)
COMPONENT OPERATING RANGE
WIRING DIAGRAM
INSPECTION PROCEDURE
Read freeze frame data using the Techstream. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, 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.
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 E32 or E40 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:
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 E32 or E40 VVT sensor connector.
(b) Disconnect the E1 or E3 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):
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 -- SECURELY REINSTALL
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 Removal.
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 E32 or E40 VVT sensor for exhaust side connector.
(b) Disconnect the E1 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):
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE ECM