P0340
2GR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0340,P0342,P0343,P0345,P0347,P0348: Camshaft Position Sensor Circuit Malfunction
DESCRIPTION
The intake camshaft's Variable Valve Timing (VVT) sensor (VV1, VV2 signal) consists of a magnet and MRE (Magnetic 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 the camshaft angle data to the ECM.
The crankshaft angle sensor plate has 34 teeth. The pickup coil generates 34 signals for each crankshaft revolution. Based on a combination of the VVT signal 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.
* VV1+ and VV2+ are the VVT sensor signal, and NE+ is the CKP sensor signal.
MONITOR DESCRIPTION
If no signal is transmitted by the VVT sensor despite the camshaft revolving, or the rotations of the camshaft and the crankshaft are not synchronized, the ECM interprets this as a malfunction of the VVT sensor.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
P0340 (Cranking):
P0340 (Engine running):
P0345 (Engine running):
P0342, P0343 (Low voltage, High voltage):
P0347, P0348 (Low voltage, High voltage):
TYPICAL MALFUNCTION THRESHOLDS
P0340 (Cranking):
P0340 (Engine running):
P0345 (Engine running):
P0342 (Low voltage):
P0343 (High voltage):
P0347 (Low voltage):
P0348 (High voltage):
COMPONENT OPERATING RANGE
CONFIRMATION DRIVING PATTERN
1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON and turn the Techstream ON.
3. Clear DTCs (even if no DTCs are stored, perform the clear DTC operation) [A].
4. Start the engine.
5. Idle the engine for 10 seconds or more [B].
6. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
7. Input the DTC: P0340, P0342, P0343, P0345, P0347 or P0348.
8. Check the DTC judgment result [C].
HINT
* If the judgment result shows ABNORMAL, the system has a malfunction.
* If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [B] and [C] again.
9. If the test result is UNKNOWN, enter the following menus: Powertrain / Engine and ECT / Trouble Code / Pending.
10. Read Pending DTCs.
HINT
If a pending DTC is output, the system is malfunctioning.
11. If the test result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs Reading and Clearing Diagnostic Trouble Codes.
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 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.
* Bank 1 refers to the bank that includes the No. 1 cylinder*.
*: The No. 1 cylinder is the cylinder which is farthest from the transmission.
* Bank 2 refers to the bank that does not include the No. 1 cylinder.
* Sensor 1 refers to the sensor closest to the engine assembly.
* Sensor 2 refers to the sensor farthest away from the engine assembly.
PROCEDURE
1. CHECK WIRE HARNESS (SENSOR POWER SOURCE)
(a) Disconnect the B59 or B45 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.
2. CHECK WIRE HARNESS (VVT SENSOR FOR INTAKE CAMSHAFT - ECM)
(a) Disconnect the B59 or B45 VVT sensor connector.
(b) Disconnect the B30 ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:
(d) Reconnect the VVT sensor connector.
(e) Reconnect the ECM connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
3. CHECK SENSOR INSTALLATION (VVT SENSOR FOR INTAKE CAMSHAFT)
(a) Check the CKP sensor installation.
OK:
Sensor is installed correctly.
NG -- SECURELY REINSTALL SENSOR
OK -- Continue to next step.
4. CHECK CAMSHAFT TIMING GEAR ASSEMBLY (TEETH OF PLATE)
(a) Check the teeth of the signal plate.
OK:
Sensor plate teeth do not have any cracks or deformation.
NG -- REPLACE CAMSHAFT TIMING GEAR ASSEMBLY
OK -- Continue to next step.
5. REPLACE VVT SENSOR
(a) Replace the VVT sensor Removal.
NEXT -- Continue to next step.
6. CHECK WHETHER DTC OUTPUT RECURS
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream ON.
(d) Clear DTCs.
(e) Start the engine.
(f) Select the following menu items: Powertrain / Engine and ECT / Trouble Codes / Pending.
(g) Read DTCs.
Result:
HINT
If the engine does not start, replace the ECM.
B -- REPLACE ECM
A -- END