P1340
1UR-FSE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1340: Camshaft Position Sensor "A" (Bank 1 Sensor 2)
DTC P1340 - Camshaft Position Sensor "A" (Bank 1 Sensor 2)
DTC P1342 - Camshaft Position Sensor "A" Low Input (MRE)
DTC P1343 - Camshaft Position Sensor "A" High Input (MRE)
DESCRIPTION
The camshaft position sensor system consists of a signal plate (installed on the camshaft timing gear RH) and Magnetic Resistance Element (MRE) type cam position sensor. The signal plate has 3 protrusions. When it rotates, the magnetic vector (direction of magnetic field) applied to the camshaft's MRE varies, which causes its resistance to vary. This varying resistance is converted to voltage, and then modified into a rectangular waveform with Hi (approximately 4 V) and Lo (approximately 1 V) outputs. As a result, the G2 signal is output to the ECM. The ECM uses the G2 signal to distinguish between the cylinders and detect the camshaft position.
- Reference: Inspection using an oscilloscope.
HINT:
- The correct waveform is as shown.
- VV1+ and VV2+ stand for the VVT sensor (for intake side) signal, and NE+ stands for the CKP sensor signal.
MONITOR DESCRIPTION
If there is no signal from the camshaft position sensor even though the engine is running, or if the rotation of the camshaft and the crankshaft is not synchronized, the ECM interprets this as a malfunction of the sensor.
When the sensor output voltage remains less than 0.3 V, or more than 4.7 V for more than 5 seconds, the ECM sets 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 [low voltage, high voltage]):
TYPICAL MALFUNCTION THRESHOLDS
P1340 (Camshaft position sensor range check):
P1340 (Camshaft position/Crankshaft position misalignment):
P1342 (Camshaft position sensor range check [low voltage]):
P1343 (Camshaft position sensor range check [high voltage]):
COMPONENT OPERATING RANGE
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 be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.
PROCEDURE
1. CHECK CAMSHAFT POSITION SENSOR (SENSOR POWER SOURCE)
(a) Disconnect the camshaft position sensor connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:
(c) Reconnect the camshaft position sensor connector.
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 (Check for open):
Standard resistance (Check for short):
(d) Reconnect the camshaft position sensor connector and ECM connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
3. CHECK SENSOR INSTALLATION
(a) Check the sensor installation.
OK:
Sensor is installed correctly.
NG -- REPAIR OR REPLACE CAMSHAFT POSITION SENSOR
OK -- Continue to next step.
4. INSPECT CAMSHAFT TIMING GEAR ASSEMBLY (BANK 2)
(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 (BANK 2)
OK -- Continue to next step.
5. CHECK VALVE TIMING P0016
NG -- ADJUST VALVE TIMING
OK -- Continue to next step.
6. REPLACE CAMSHAFT POSITION SENSOR
(a) Replace the camshaft position sensor Components.
NEXT -- Continue to next step.
7. CHECK WHETHER DTC OUTPUT RECURS (DTC P1340, P1342 AND/OR P1343)
(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) Start the engine.
(f) Enter the following menus: Powertrain / Engine / Trouble Codes.
(g) Read DTCs.
Result:
HINT: If the engine does not start, replace the ECM.
B -- REPLACE ECM
A -- END
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 (Check for open):
Standard resistance (Check for short):
(d) Reconnect the camshaft position sensor connector.
(e) Reconnect the ECM connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE ECM