P1340
1UR-FE ENGINE CONTROL: SFI SYSTEM: P1340,P1342,P1343: Camshaft Position Sensor "A" (Bank 1 Sensor 2)
P1343 - Camshaft Position Sensor "A" High Input (MRE)
DESCRIPTION
The camshaft position sensor (G signal) consists of a magnet and MRE (Magneto resistance Element).
The camshaft timing gear (LH) has 3 teeth on its outer circumference. When the camshaft timing gear rotates, the air gap between the protrusion on the gear and the MRE changes. The change affects the magnetic field and results in changes in the resistance of the MRE.
The crankshaft angle sensor rotor has 34 teeth and is mounted on the crankshaft. The crankshaft position sensor generates 34 signals per crankshaft revolution. The ECM uses the G2 signal to distinguish between the cylinders, and uses the NE signal to detect the crankshaft position and engine speed.
- Reference: Inspection using an oscilloscope.
Standard:
HINT
G2 is the camshaft position sensor signal, and NE is the crankshaft position sensor signal.
MONITOR DESCRIPTION
If no signal is transmitted by the camshaft position sensor despite the engine running, or the rotations of the camshaft and crankshaft are not synchronized, the ECM interprets this as a malfunction of the sensor. Also, when the sensor output voltage remains below 0.3 V, or higher than 4.7 V for more than 4 seconds, the ECM stores a DTC.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
P1340 Camshaft Position Sensor Range Check
P1340 Camshaft Position/Crankshaft Position Misalignment
P1342, P1343 Camshaft Position Sensor Range Check
TYPICAL MALFUNCTION THRESHOLDS
P1340 Camshaft Position Sensor Range Check
P1340 Camshaft Position/Crankshaft Position Misalignment
P1342 Camshaft Position Sensor Range Check
P1343 Camshaft Position Sensor Range Check
COMPONENT OPERATING RANGE
CONFIRMATION DRIVING PATTERN
- Connect the Techstream to the DLC3.
- Turn the engine switch on (IG) and turn the Techstream on.
- Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).
- Turn the engine switch off and wait for at least 30 seconds.
- Turn the engine switch on (IG) and turn the Techstream on.
- Start the engine.
- Idle the engine for 10 seconds or more [A].
- Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [B].
- 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.
- Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
- Input the DTC: P1340, P1342 or P1343.
- 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] through [B] again.
- 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
INSPECTION PROCEDURE
HINT
Read freeze frame data using the Techstream. Freeze frame data records the engine conditions 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 CAMSHAFT POSITION SENSOR (SENSOR POWER SOURCE)
(a) Disconnect the camshaft position 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
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (ECM - CAMSHAFT POSITION SENSOR)
(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
(a) Check the camshaft position sensor installation.
OK:
The camshaft position sensor is installed properly.
NG -- SECURELY REINSTALL SENSOR Installation
OK -- Continue to next step.
4. INSPECT CAMSHAFT TIMING GEAR ASSEMBLY (SENSOR PLATE TOOTH)
(a) Check the teeth of the sensor 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 CAMSHAFT POSITION SENSOR
(a) Replace the camshaft position sensor Removal.
NEXT -- Continue to next step.
6. CHECK WHETHER DTC OUTPUT RECURS
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Clear DTCs DTC Check / Clear.
(e) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
(f) Read DTCs.
Result
HINT
If the engine does not start, replace the ECM.
B -- REPLACE ECM Removal
A -- END