P0340
2AZ-FXE 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 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 (included in the hybrid vehicle control ECU) to detect the camshaft position. This signal is then used to control ignition timing, fuel injection duration, 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 in the illustration.
- G2+ stands for the CMP sensor signal, and NE+ stands for the Crankshaft Position (CKP) sensor signal.
- A failure of the ground for the shielding of the wiring may result in noisy waveforms.
MONITOR DESCRIPTION
If no signal is transmitted by the CMP sensor despite the engine rotating, or the rotation of the camshaft and the crankshaft is not synchronized, the ECM (included in the hybrid vehicle control ECU) 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
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 (included in the hybrid vehicle control ECU) 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.
PROCEDURE
1. INSPECT CAMSHAFT POSITION SENSOR (RESISTANCE)
(a) Disconnect the C31 Camshaft Position (CMP) sensor connector.
(b) Measure the resistance between terminals 1 and 2.
Standard resistance:
HINT: 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).
(c) Reconnect the CMP sensor connector.
NG -- REPLACE CAMSHAFT POSITION SENSOR
OK -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR - HYBRID VEHICLE CONTROL ECU)
(a) Disconnect the C31 CMP sensor connector.
(b) Disconnect the C64 hybrid vehicle control ECU connector.
(c) Measure the resistance.
Standard resistance (Check for open):
Standard resistance (Check for short):
(d) Reconnect the hybrid vehicle control ECU 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 -- SECURELY REINSTALL SENSOR
OK -- Continue to next step.
4. CHECK VALVE TIMING P0011
NG -- ADJUST VALVE TIMING
OK -- Continue to next step.
5. CHECK CAMSHAFT
(a) Check the sensor signal teeth on the camshaft.
OK:
Camshaft teeth do not have any cracks or deformation.
NG -- REPLACE CAMSHAFT
OK -- Continue to next step.
6. REPLACE CAMSHAFT POSITION SENSOR
(a) Replace the camshaft position sensor Removal.
NEXT -- Continue to next step.
7. CHECK WHETHER DTC OUTPUT RECURS
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Turn the tester on.
(d) Clear the DTCs DTC Check / Clear.
(e) Put the engine in inspection mode Component Tests and General Diagnostics.
(f) Select the following menu items: Powertrain / Engine / Trouble Code / Pending.
(g) Read the DTCs.
Result:
HINT: If the engine does not start, replace the hybrid vehicle control ECU.
B -- REPLACE HYBRID VEHICLE CONTROL ECU
A -- END