P0340

1ZZ-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)

DTC P0341 - Camshaft Position Sensor "A" Circuit Range / Performance (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).
- DTC P0341 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 above.
- 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 despite the engine revolving, 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

All:





Camshaft Position Sensor Range Check P0340:





Camshaft Position/Crankshaft Position Misalignment P0340:





Camshaft Position Sensor Malfunction P0341:





TYPICAL MALFUNCTION THRESHOLDS

Camshaft Position Sensor Range Check P0340:





Camshaft Position/Crankshaft Position Misalignment P0340:





Camshaft Position Sensor Malfunction P0341:





COMPONENT OPERATING RANGE





WIRING DIAGRAM





INSPECTION PROCEDURE

HINT: Read freeze frame data using 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 (CMP) sensor connector.
(b) Measure the resistance between terminals 1 and 2.
Standard resistance:





NOTE: 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 CMP sensor connector.
NG -- REPLACE CAMSHAFT POSITION SENSOR
OK -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR - ECM)





(a) Disconnect the C1 CMP sensor connector.
(b) Disconnect the E4 ECM connector.
(c) Check the resistance.
Standard resistance (Check for open):





Standard resistance (Check for short):





(d) Reconnect the ECM connector.
(e) Reconnect the CMP sensor connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
3. CHECK CAMSHAFT POSITION SENSOR (SENSOR INSTALLATION)





(a) Check the CMP sensor installation.
OK:
Sensor is installed correctly.
NG -- REPAIR OR REPLACE CAMSHAFT POSITION 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