Up to 08/2009
2GR-FE ENGINE CONTROL: SFI SYSTEM: P0340,P0342,P0343,P0345,P0347,P0348: Camshaft Position Sensor Circuit Malfunction
DESCRIPTION
The intake camshaft's VVT sensor (VV1, VV2 signal) consists of a magnet and MRE (Magneto Resistive 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 it to the ECM.
The crank angle sensor plate has 34 teeth. The pickup coil generates 34 signals for each engine rotation. Based on combination of the VVT signals 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+ stand for the VVT sensor signal, and NE+ stands for the crankshaft position 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 (Bank 1) Verify Pulse Input (Case 1)
P0340: VVT Sensor (Bank 1) Verify Pulse Input (Case 2)
P0342, P0343: VVT Sensor (Bank 1) Range Check
P0345: VVT Sensor (Bank 2) Verify Pulse Input
P0347, P0348: VVT Sensor (Bank 1) Range Check
TYPICAL MALFUNCTION THRESHOLDS
P0340: VVT Sensor (Bank 1) Verify Pulse Input (Case 1)
P0340: VVT Sensor (Bank 1) Verify Pulse Input (Case 2)
P0342, P0347: VVT Sensor (Bank1, 2) Range Check (Low Voltage)
P0343, P0348: VVT Sensor (Bank1, 2) Range Check (High voltage)
P0345: VVT Sensor (Bank 2) Verify Pulse Input
COMPONENT OPERATING RANGE
CONFIRMATION DRIVING PATTERN
- Connect the Techstream to the DLC3.
- Turn the engine switch on (IG) and turn the Techstream on.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure) DTC Check / Clear.
- Turn the engine switch off.
- Turn the engine switch on (IG) and turn the Techstream on [A].
- Start the engine.
- Idle the engine for 10 seconds or more [B].
- Enter the following menus: Powertrain / Engine / Utility / All Readiness.
- Input the DTC: P0340, P0342, P0343, P0345, P0347 or P0348.
- 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.
- If the test result is UNKNOWN, enter the following menus: Powertrain / Engine / Trouble Codes / Pending.
- Read Pending DTCs.
HINT
If a pending DTC is output, the system is malfunctioning.
- If the test result is INCOMPLETE or UNKNOWN and 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
INSPECTION PROCEDURE
HINT
- 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 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.
- If no problem is found by this diagnostic troubleshooting procedure, troubleshoot the engine mechanical system.
PROCEDURE
1. CHECK VVT SENSOR FOR INTAKE SIDE (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:
Text in Illustration
(d) Reconnect the VVT sensor connector.
NG -- CHECK HARNESS AND CONNECTOR (VVT SENSOR FOR INTAKE SIDE - ECM)
OK -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (VVT SENSOR FOR INTAKE 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):
Text in Illustration
(d) Reconnect the VVT sensor connector.
(e) Reconnect the ECM connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (VVT SENSOR FOR INTAKE SIDE - ECM)
OK -- Continue to next step.
3. CHECK SENSOR INSTALLATION (VVT SENSOR FOR INTAKE SIDE)
(a) Check the VVT sensor installation.
OK:
Sensor is installed correctly.
NG -- SECURELY REINSTALL VVT SENSOR FOR INTAKE SIDE Removal
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 Removal
OK -- Continue to next step.
5. REPLACE VVT SENSOR FOR INTAKE SIDE
(a) Replace the VVT sensor Removal.
NEXT -- Continue to next step.
6. CHECK WHETHER DTC OUTPUT RECURS (DTC P0340, P0342, P0343, P0345, P0347 AND/OR P0348)
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Clear the DTCs DTC Check / Clear.
(e) Turn the engine switch off.
(f) Turn the engine switch on (IG) and turn the Techstream on.
(g) Start the engine and warm it up.
(h) Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
(i) Enter the following menus: Powertrain / Engine / Utility / All Readiness.
(j) Input the P0340, P0342, P0343, P0345, P0347, or P0348.
(k) Check the DTC judgment result.
Result:
HINT
If the engine does not start, replace the ECM.
B -- REPLACE ECM Removal
A -- END
7. CHECK HARNESS AND CONNECTOR (VVT SENSOR FOR INTAKE 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):
Text in Illustration
(d) Reconnect the VVT sensor connector.
(e) Reconnect the ECM connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (VVT SENSOR FOR INTAKE SIDE - ECM)
OK -- REPLACE ECM Removal