SFI System
2AR-FXE ENGINE CONTROL: SFI SYSTEM: P0340, P0342, P0343: Camshaft Position Sensor Circuit Malfunction
DESCRIPTION
The camshaft position sensor for the intake camshaft (VV1 signal) consists of a magnet and MRE (Magneto Resistance Element).
The camshaft has a timing rotor for the camshaft position sensor. When the 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 camshaft position sensor converts the 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 and injection timing.
- Reference: Inspection using an oscilloscope.
HINT
The correct waveform is as shown.
MONITOR DESCRIPTION
If no pulse signal is transmitted by the camshaft position sensor 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 more than 4 seconds, the ECM stores a DTC.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
All
P0340
P0342 and P0343
TYPICAL MALFUNCTION THRESHOLDS
P0340
P0342
P0343
COMPONENT OPERATING RANGE
CONFIRMATION DRIVING PATTERN
1. Connect the Techstream to the DLC3.
2. Turn the power 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 power switch off and wait for at least 30 seconds.
5. Turn the power switch on (IG) and turn the Techstream on.
6. Put the engine in inspection mode (maintenance mode) Component Tests and General Diagnostics.
7. Start the engine.
8. Idle the engine for 10 seconds or more [A].
9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [B].
10. 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.
11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
12. Input the DTC: P0340, P0342 or P0343.
13. 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.
14. 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
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 through this diagnostic troubleshooting procedure, there may be a mechanical problem with the engine.
PROCEDURE
1. CHECK TERMINAL VOLTAGE (POWER SOURCE OF CAMSHAFT POSITION SENSOR)
(a) Disconnect the camshaft position sensor connector.
(b) Turn the power 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 (CAMSHAFT POSITION SENSOR - ECM)
OK -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR - ECM)
(a) Disconnect the camshaft position sensor 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 (CAMSHAFT POSITION SENSOR)
(a) Check the camshaft position sensor installation.
OK:
Camshaft position sensor is installed correctly.
NG -- SECURELY REINSTALL CAMSHAFT POSITION SENSOR Installation
OK -- Continue to next step.
4. INSPECT INTAKE CAMSHAFT (TIMING ROTOR)
(a) Check the timing rotor of the intake camshaft.
OK:
Timing rotor does not have any cracks or deformation.
HINT
Perform "Inspection After Repair" after replacing the intake camshaft Programming and Relearning.
NG -- REPLACE INTAKE CAMSHAFT 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 CAMSHAFT POSITION SENSOR
(a) Replace the camshaft position sensor Removal.
NEXT -- Continue to next step.
7. CHECK WHETHER DTC OUTPUT RECURS (DTC P0340, P0342 OR P0343)
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Turn the Techstream on.
(d) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(e) Turn the power switch off and wait for at least 30 seconds.
(f) Turn the power switch on (IG).
(g) Turn the Techstream on.
(h) Put the engine in inspection mode (maintenance mode) Component Tests and General Diagnostics.
(i) Start the engine.
(j) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
(k) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
(l) Read the DTCs.
Result
HINT
If the engine does not start, replace the ECM.
B -- END
A -- REPLACE ECM Removal
8. CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR - ECM)
(a) Disconnect the camshaft position sensor 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