Dtc P0340 Camshaft Position Sensor A Circuit (Bank 1 Or Single Sensor)
DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
INSPECT CAMSHAFT POSITION SENSOR (RESISTANCE)
CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR - ECM)
CHECK SENSOR INSTALLATION (CAMSHAFT POSITION SENSOR)
CHECK VALVE TIMING
INSPECT CAMSHAFT
CHECK WHETHER DTC OUTPUT RECURS
DTC P0340 Camshaft Position Sensor "A" Circuit (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 onto the cylinder head. When the camshaft rotates, each of 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
| When either of following conditions is met:
- No camshaft position sensor signal to ECM while cranking (2 trip detection logic)
- Missing camshaft position sensor signal despite crankshaft position sensor signal inputs normal at engine speed of 600 rpm or more (1 trip detection logic)
| - Open or short in camshaft position sensor circuit
- Camshaft position sensor
- Camshaft
- Timing chain jumped a tooth
- ECM
|
- HINT:
- DTC P0340 indicates a malfunction relating to the camshaft position sensor circuit (the wire harness between the ECM and camshaft position sensor, and the camshaft position sensor itself).
Reference: Inspection using an oscilloscope
- HINT:
- The correct waveform is as shown in the illustration.
- G2+ stands for the camshaft position sensor signal, and NE+ stands for the crankshaft position sensor signal.
- A failure of the ground for the shielding of the wiring may result in noisy waveforms.
ECM Terminal Name
| CH1: Between G2+ and G2-
CH2: Between NE+ and NE-
|
Tester Range
| 5 V/DIV., 20 ms/DIV.
|
Condition
| Idling with warm engine
|
WIRING DIAGRAM
Refer to DTC P0335 (Link).
INSPECTION PROCEDURE
- HINT:
- Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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) |
Disconnect the camshaft position sensor connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Condition
| Specified Condition
|
1 - 2
| Cold
| 835 to 1400 Ω
|
1 - 2
| Hot
| 1060 to 1645 Ω
|
Text in Illustration*1
| Component without harness connected
(Camshaft Position Sensor)
|
- NOTICE:
- 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).
Reconnect the camshaft position sensor connector.
| 2.CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR - ECM) |
Disconnect the camshaft position sensor connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance (Check for Open):
Tester Connection
| Condition
| Specified Condition
|
C31-1 - C24-99 (G2+)
| Always
| Below 1 Ω
|
C31-2 - C24-98 (G2-)
| Always
| Below 1 Ω
|
- Standard Resistance (Check for Short):
Tester Connection
| Condition
| Specified Condition
|
C31-1 or C24-99 (G2+) - Body ground
| Always
| 10 kΩ or higher
|
C31-2 or C24-98 (G2-) - Body ground
| Always
| 10 kΩ or higher
|
Reconnect the ECM connector.
Reconnect the camshaft position sensor connector.
| | REPAIR OR REPLACE HARNESS OR CONNECTOR (CAMSHAFT POSITION SENSOR - ECM) |
|
|
| 3.CHECK SENSOR INSTALLATION (CAMSHAFT POSITION SENSOR) |
Check the camshaft position sensor installation.
- OK:
- Sensor is installed correctly.
Remove the cylinder head cover.
Turn the crankshaft pulley, then align its groove with the timing mark "0" on the timing chain cover.
Check that the point marks on the camshaft timing gears are aligned with the timing chain cover surface as shown in the illustration.
If not, turn the crankshaft 1 revolution (360°), then align the marks as above.
- OK:
- Alignment marks on camshaft timing gears are aligned as shown in the illustration.
Text in Illustration*1
| Alignment Marks
|
*2
| Groove
|
Reinstall the cylinder head cover.
Check the teeth of the camshaft.
- OK:
- Camshaft teeth do not have any cracks or deformation.
| 6.CHECK WHETHER DTC OUTPUT RECURS |
Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON.
Turn the tester on.
Clear the DTCs (CAMRY_ACV40 RM000000PDK0LEX.html).
Start the engine.
Enter the following menus: Powertrain / Engine and ECT / DTC.
Read the DTCs.
- Result:
Result
| Proceed to
|
DTC is not output
| A
|
DTC P0340 is output
| B
|
- HINT:
- If the engine does not start, replace the ECM.
