Dtc P0340/12 Camshaft Position Sensor Circuit Malfunction


DESCRIPTION

MONITOR DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT CAMSHAFT POSITION SENSOR (RESISTANCE)

CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR - ECM)

CHECK CAMSHAFT POSITION SENSOR (INSTALLATION)

CHECK CAMSHAFT

DTC P0340/12 Camshaft Position Sensor Circuit Malfunction

DTC P0341/12 Camshaft Position Sensor "A" Circuit Range / Performance (Bank 1 or Single Sensor)


DESCRIPTION

The camshaft position sensor consists of a magnet and an iron core which is wrapped with copper wire, and is installed on the cylinder head. When the camshaft rotates, each of the 3 teeth on the camshaft passes through the camshaft position 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 camshaft position 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.

DTC No.
DTC Detection Condition
Trouble Area
P0340/12
When either condition below is met:
  1. No camshaft position sensor signal to ECM during cranking (2 trip detection logic)
  2. No camshaft position sensor signal to ECM at engine speed of 600 rpm or more (1 trip detection logic)
  1. Open or short in camshaft position sensor circuit
  2. Camshaft position sensor
  3. Camshaft timing gear
  4. Jumped tooth of timing chain
  5. ECM
P0341/12
While crankshaft rotates twice, camshaft position sensor signal is input to ECM 12 times or more (1 trip detection logic)
  1. Open or short in camshaft position sensor circuit
  2. Camshaft position sensor
  3. Camshaft timing gear
  4. Jumped tooth of timing chain
  5. ECM
HINT:
  1. DTC P0340/12 indicates a malfunction related to the camshaft position sensor (+) circuit (the wire harness between the ECM and camshaft position sensor, and the camshaft position sensor itself).
  2. DTC P0341/12 indicates a malfunction related to the camshaft position sensor (-) circuit (the wire harness between the ECM and camshaft position sensor, and the camshaft position sensor itself).

MONITOR DESCRIPTION

If there is no signal from the VVT 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.
This monitor runs for 10 seconds (the first 10 seconds of engine idle) after the engine is started.

WIRING DIAGRAM

Refer to DTC P0335/13 (Toyota Fortuner RM000000ZQI006X_03.html).

INSPECTION PROCEDURE

HINT:
Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, 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.
1.INSPECT CAMSHAFT POSITION SENSOR (RESISTANCE)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.2Tr-Fe Engine Control System.Sfi System. Dtc P0340/12 Camshaft Position Sensor Circuit Malfunction

  1. Disconnect the C1 sensor connector.

  1. Measure the resistance of the sensor.

    Standard resistance:
    Tester Connection
    		Sensor Condition
    		Specified Condition
    1 - 2
    		Cold
    		835 to 1,400 Ω
    1 - 2
    		Hot
    		1,060 to 1,645 Ω
    NOTICE:
    In the chart above, the terms "Cold" and "Hot" refer to the temperature of the sensor. "Cold" means approximately -10 to 50°C (14 to 122°F). "Hot" means approximately 50 to 100°C (122 to 212°F).


NG
REPLACE CAMSHAFT POSITION SENSOR
OK


2.CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR - ECM)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.2Tr-Fe Engine Control System.Sfi System. Dtc P0340/12 Camshaft Position Sensor Circuit Malfunction

  1. Disconnect the C1 sensor connector.

  1. Disconnect the E11 ECM connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    C1-1 - E11-26 (G2)
    		Below 1 Ω
    C1-2 - E11-34 (NE-)
    		Below 1 Ω
    C1-1 or E11-26 (G2) - Body ground
    		10 kΩ or higher
    C1-2 or E11-34 (NE-) - Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.CHECK CAMSHAFT POSITION SENSOR (INSTALLATION)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.2Tr-Fe Engine Control System.Sfi System. Dtc P0340/12 Camshaft Position Sensor Circuit Malfunction

  1. Check that the sensor is installed correctly.

    OK:
    Sensor is installed correctly.


NG
SECURELY REINSTALL CAMSHAFT POSITION SENSOR
OK


4.CHECK CAMSHAFT

  1. Check that the teeth of the camshaft do not have any cracks or deformation.

    OK:
    Teeth do not have cracks or deformation.


NG
REPLACE CAMSHAFT
OK

REPLACE ECM