P0340
2GR-FE ENGINE CONTROL: SFI SYSTEM: P0340, P0342, P0343, P0345, P0347, P0348: Camshaft Position Sensor Circuit Malfunction
DESCRIPTION
The VVT sensor (for intake camshaft) (VV1, VV2 signal) consists of a magnet and MRE (Magneto Resistance Element).
The camshaft timing gear assembly has a sensor plate for the VVT sensor. When the intake camshaft rotates, changes occur in the air gaps between the timing rotor and MRE, which affects the magnetic field. As a result, the resistance of the MRE material fluctuates. The VVT sensor converts the intake camshaft rotation data to pulse signals, uses the pulse signals to determine the camshaft angle, and sends it to the ECM.
Then the ECM uses this data to control fuel injection duration, fuel injection timing and Variable Valve Timing (VVT) system.
HINT
Reference: Inspection using an oscilloscope SFI System.
MONITOR DESCRIPTION
If no pulse signal is transmitted by the VVT sensor (for intake camshaft) despite the camshaft rotating, or the rotation of the camshaft and the crankshaft is not synchronized, the ECM interprets this as a malfunction of the sensor.
Also, when the sensor output voltage remains at less than 0.3 V, or higher than 4.7 V for 4 seconds, the ECM stores a DTC.
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 and P0343: VVT Sensor (Bank 1) Range Check
P0345: VVT Sensor (Bank 2) Verify Pulse Input
P0347 and P0348: VVT Sensor (Bank 2) 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 and P0347: VVT Sensor (Bank1, 2) Range Check (Low Voltage)
P0343 and P0348: VVT Sensor (Bank1, 2) Range Check (High voltage)
P0345: VVT Sensor (Bank 2) Verify Pulse Input
COMPONENT OPERATING RANGE
CONFIRMATION DRIVING PATTERN
1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
4. Turn the engine switch off and wait for at least 30 seconds.
5. Turn the engine switch on (IG) 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 / Trouble Codes [B].
9. Read the pending DTCs.
HINT
* If a pending DTC is output, the system is malfunctioning.
* If a pending DTC is not output, perform the following procedure.
10. Enter the following menus: Powertrain / Engine / 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 N/A, perform steps [A] and [B] again.
13. If 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 SFI System.
INSPECTION PROCEDURE
HINT
* If no problem is found through this diagnostic troubleshooting procedure, there may be a mechanical problem with the engine.
* Bank 1 refers to the bank that includes the No. 1 cylinder*.
*: The No. 1 cylinder is the cylinder which is farthest from the transaxle.
* Bank 2 refers to the bank that does not include the No. 1 cylinder.
* 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.
PROCEDURE
1. CHECK TERMINAL VOLTAGE (POWER SOURCE OF VVT SENSOR (FOR INTAKE CAMSHAFT))
(a) Disconnect the VVT sensor (for intake camshaft) 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
NG -- CHECK HARNESS AND CONNECTOR (VVT SENSOR (FOR INTAKE CAMSHAFT) - ECM)
OK -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (VVT SENSOR (FOR INTAKE CAMSHAFT) - ECM)
(a) Disconnect the VVT sensor (for intake camshaft) connector.
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
3. CHECK SENSOR INSTALLATION (VVT SENSOR (FOR INTAKE CAMSHAFT))
(a) Check the VVT sensor (for intake camshaft) installation.
OK:
VVT sensor is installed correctly.
NG -- SECURELY REINSTALL VVT SENSOR (FOR INTAKE CAMSHAFT) Installation
OK -- Continue to next step.
4. INSPECT CAMSHAFT TIMING GEAR ASSEMBLY (TEETH OF SENSOR PLATE)
(a) Inspect the teeth of the sensor plate.
OK:
Sensor plate teeth do not have any cracks or deformation.
HINT
Perform "Inspection After Repair" after replacing the camshaft timing gear assembly Programming and Relearning.
NG -- REPLACE CAMSHAFT TIMING GEAR ASSEMBLY Removal
OK -- Continue to next step.
5. CHECK VALVE TIMING (CHECK FOR LOOSE TIMING CHAIN AND JUMPED TEETH) P0011
NG -- ADJUST VALVE TIMING Reassembly
OK -- Continue to next step.
6. REPLACE VVT SENSOR (FOR INTAKE CAMSHAFT)
(a) Replace the VVT sensor (for intake camshaft) Removal.
NEXT -- Continue to next step.
7. CHECK WHETHER DTC OUTPUT RECURS (DTC P0340, P0342, P0343, P0345, P0347 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 Reading and Clearing Diagnostic Trouble Codes.
(e) Turn the engine switch off and wait for at least 30 seconds.
(f) Start the engine.
(g) Turn the Techstream on.
(h) Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
(i) Enter the following menus: Powertrain / Engine / Trouble Codes.
(j) Read the pending DTCs.
Result
HINT
If the engine does not start, replace the ECM.
B -- END
A -- REPLACE ECM Removal
8. CHECK HARNESS AND CONNECTOR (VVT SENSOR (FOR INTAKE CAMSHAFT) - ECM)
(a) Disconnect the VVT sensor (for intake camshaft) connector.
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE ECM Removal