P0342
1GR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0340,P0342,P0343,P0345,P0347,P0348: Camshaft Position Sensor "A" Circuit (Bank 1 or Single Sensor)
DESCRIPTION
The intake camshaft's Variable Valve Timing (VVT) sensor (G 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 affect 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 on the combination of the G 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.
- Inspection using an oscilloscope
HINT
* The correct waveform is shown above.
* VV1+ and VV2+ 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
P0340 VVT Sensor Verify Pulse Input
P0340 Camshaft Position/Crankshaft Position Misalignment
P0342, P0343, P0347, P0348 VVT Sensor Range Check (Low Voltage, High Voltage)
P0345 VVT Sensor Verify Pulse Input
TYPICAL MALFUNCTION THRESHOLDS
P0340, P0345 VVT Sensor Verify Pulse Input
P0340 Camshaft Position/Crankshaft Position Misalignment
P0342, P0347 VVT Sensor Range Check (Low Voltage)
P0343, P0348 VVT Sensor Range Check (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 the DTCs (even if no DTCs are stored, perform the clear DTC operation).
4. Turn the ignition switch off and wait for at least 30 seconds.
5. Turn the ignition switch to ON and turn the Techstream on.
6. Start the engine.
7. Idle the engine for 10 seconds or more [A].
8. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [B].
9. Read the DTCs.
HINT
* If a DTC is output, the system is malfunctioning.
* If a DTC is not output, perform the following procedure.
10. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
11. Input the DTC: P0340, P0342, P0343, P0345, P0347 or P0348.
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 steps [A] and [B] again.
13. If no pending 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 the Techstream. Freeze frame data record 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. INSPECT 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:
NG -- REPLACE VVT SENSOR Removal
OK -- Continue to next step.
2. CHECK VVT SENSOR (SENSOR POWER SOURCE)
(a) Disconnect the 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 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.
(e) Reconnect the ECM connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
4. CHECK SENSOR INSTALLATION (VVT SENSOR)
(a) Check the CKP sensor installation.
OK:
Sensor is installed correctly.
NG -- TIGHTEN SENSOR Installation
OK -- Continue to next step.
5. INSPECT CAMSHAFT TIMING GEAR ASSEMBLY (TEETH 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 -- REPLACE ECM Removal