P1340
3UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1340: Camshaft Position Sensor "A" (Bank 1 Sensor 2)
DTC P1340 - Camshaft Position Sensor "A" (Bank 1 Sensor 2)
DESCRIPTION
The camshaft position sensor, like the crankshaft position sensor, consists of a coil, a magnet and an iron core wrapped in copper wire. The camshaft has a tooth and the camshaft position sensor is installed so that it can detect the tooth passing by. When the camshaft rotates and the tooth passes by the camshaft position sensor, the magnet on the camshaft position sensor creates a magnetic field and voltage is generated in the copper wire. When the camshaft makes one full rotation, voltage will be generated in the camshaft position sensor once. The crankshaft position sensor is basically the same. When the crankshaft makes one rotation, its 34 teeth pass by the crankshaft position sensor and voltage is generated 34 times. The camshaft rotates at half the speed of the crankshaft. Therefore, the camshaft position sensor generates voltage once in the time the crankshaft makes 2 rotations.
The ECM detects generation of these voltages to indicate the cylinder.
MONITOR DESCRIPTION
If there is no signal from the camshaft position sensor even though the engine is turning, or if the rotation of the camshaft and the crankshaft is not synchronized, the ECM interprets this as a malfunction of the sensor.
This monitor runs for 5 seconds (the first 5 seconds of engine idle) after the engine is started.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
Camshaft position sensor range check:
Camshaft position / Crankshaft position misalignment:
TYPICAL MALFUNCTION THRESHOLDS
Camshaft position sensor range check:
Camshaft position / Crankshaft position misalignment:
COMPONENT OPERATING RANGE
WIRING DIAGRAM
INSPECTION PROCEDURE
(a) Camshaft position sensor.
(b) Crankshaft position sensor.
NOTE:
The wavelength becomes shorter as the engine rpm increases.
HINT:
- Read freeze frame data using the Techstream. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, 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.
- DTC P1340 indicates a malfunction related to the camshaft position sensor (+) circuit.
PROCEDURE
1. INSPECT CAMSHAFT POSITION SENSOR
(a) Disconnect the C1 sensor connector.
(b) Measure the resistance of the sensor.
Standard resistance:
NOTE:
In the above section, the terms "Cold" and "Hot" refer to the temperature of the sensor. "Cold" means approximately -10 to 50°C (14 to 212°F). "Hot" means approximately 50 to 100°C (122 to 212°F).
NG -- REPLACE CAMSHAFT POSITION SENSOR
OK -- Continue to next step.
2. CHECK WIRE HARNESS (CAMSHAFT POSITION SENSOR - ECM)
(a) Disconnect the C1 camshaft position sensor connector.
(b) Disconnect the E2 ECM connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:
NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.
3. CHECK SENSOR INSTALLATION
(a) Check the sensor installation.
OK:
Sensor is installed correctly.
NG -- SECURELY REINSTALL SENSOR
OK -- Continue to next step.
4. CHECK VALVE TIMING
(a) Remove the engine cover.
(b) Remove the drive belt.
(c) Remove the timing belt cover LH and RH.
(d) Turn the crankshaft to align the matchmarks of the crankshaft.
(e) Align the notch of the crankshaft pulley with the "0" position.
(f) Confirm whether the matchmarks of the camshaft pulley and cylinder head cover are facing each other.
(g) If the matchmarks are not facing each other, turn the crankshaft clockwise by 360°. Confirm again if the matchmarks are facing each other.
OK:
The matchmarks of the camshaft pulley and the cylinder head cover face each other when the notch of the crankshaft pulley is in the "0" position.
NG -- ADJUST VALVE TIMING
OK -- REPLACE ECM