P0340

2AZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0340: Camshaft Position Sensor "A" Circuit (Bank 1 or Single Sensor)

DTC P0340 - Camshaft Position Sensor "A" Circuit (Bank 1 or Single Sensor)

DESCRIPTION

The Camshaft Position (CMP) sensor consists of a magnet and an iron core which is wrapped with copper wire, and is installed onto the cylinder head. When the camshaft rotates, each of 3 teeth on the camshaft passes through the CMP sensor. This activates the internal magnet in the sensor, generating a voltage in the copper wire. The camshaft rotation is synchronized with the crankshaft rotation. When the crankshaft turns twice, the voltage is generated 3 times in the CMP sensor. The generated voltage in the sensor acts as a signal, allowing the ECM to locate the camshaft position. This signal is then used to control ignition timing, fuel injection timing, and the VVT system.





HINT: DTC P0340 indicates a malfunction relating to the CMP sensor (+) circuit (the wire harness between the ECM and CMP sensor, and the CMP sensor itself).





Reference: Inspection using an oscilloscope.
HINT:
- The correct waveform is as shown.
- G2+ stands for the CMP sensor signal, and NE+ stands for the Crankshaft Position (CKP) sensor signal.





MONITOR DESCRIPTION

If no signal is transmitted by the CMP sensor although the engine is running, or the rotation of the camshaft and the crankshaft is not synchronized, the ECM interprets this as a malfunction of the sensor.
If the malfunction is not repaired successfully, a DTC is set 10 seconds after the engine is next 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
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. INSPECT CAMSHAFT POSITION SENSOR (RESISTANCE)




(a) Disconnect the C1 camshaft position sensor connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:





HINT: Terms "cold" and "hot" refer to the temperature of the coils. "Cold" means approximately -10 to 50°C (14 to 122°F). "Hot" means approximately 50 to 100°C (122 to 212°F).
(c) Reconnect the camshaft position sensor.
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 E8 ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:





(d) Reconnect the camshaft position sensor connector.
(e) Reconnect the ECM connector.
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:
Sensor is installed correctly.
NG -- TIGHTEN SENSOR
OK -- Continue to next step.
4. CHECK CAMSHAFT
(a) Check the teeth of the camshaft.
OK:
Camshaft teeth do not have any cracks or deformation.
NG -- REPLACE CAMSHAFT
OK -- REPLACE ECM