P1340
DTC P1340 Camshaft Position Sensor "A" (Bank 1 Sensor 2)DESCRIPTION
DTC Detection Condition:
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
Monitor Strategy:
Typical Enabling Conditions:
Typical Malfunctions Thresholds:
Component Operating Range:
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.
Wiring Diagram:
Step 1-2:
Step 3-4:
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 intelligent tester. 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.