P0342

1GR-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 P0342 - Camshaft Position Sensor "A" Circuit Low Input (Bank 1 or Single Sensor)

DTC P0343 - Camshaft Position Sensor "A" Circuit High Input (Bank 1 or Single Sensor)

DTC P0345 - Camshaft Position Sensor "A" Circuit (Bank 2)

DTC P0347 - Camshaft Position Sensor "A" Circuit Low Input (Bank 2)

DTC P0348 - Camshaft Position Sensor "A" Circuit High Input (Bank 2)

DESCRIPTION

The variable valve timing (VVT) sensor (VV signal) consists of a magnet, iron core and pickup coil.
The VV signal plate has 3 teeth on its outer circumference and is installed on the camshaft timing pulley.
When the camshafts rotate, the protrusion on the signal plate and the air gap on the pickup coil change, causing fluctuations in the magnetic field and generating a voltage in the pickup coil.
This sensor monitors a timing rotor located on the camshaft and is used to detect a camshaft angle by the ECM. The camshaft rotation synchronizes with the crankshaft rotation, and this sensor communicates the rotation of the camshaft timing rotor as a pulse signal to the ECM. Based on the signal, the ECM controls fuel injection time and ignition timing.





Reference: Inspection using an oscilloscope





HINT:
- The correct waveform is shown on the illustration.
- VV1+ and VV2+ stands for the VVT sensor signal, and NE+ stands for the CKP sensor signal.





MONITOR DESCRIPTION

If there is no signal from the VVT sensor even though the engine is turning, or if the rotation of the camshaft and crankshaft is not synchronized, the ECM interprets this as a malfunction of the sensor.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS

All:





Camshaft Position Sensor Range Check:





Camshaft Position/Crankshaft Position Misalignment:





Camshaft Position Sensor Range Check (Chattering, Low voltage, High voltage):





VVT sensor range check (While starting engine):





VVT sensor range check (After starting engine):





VVT sensor range check (Chattering, Low voltage, High voltage):





TYPICAL MALFUNCTION THRESHOLDS

Camshaft Position Sensor Range Check:





Camshaft Position/Crankshaft Position Misalignment:





Camshaft Position Sensor Range Check (Chattering):





Camshaft Position Sensor Range Check (Low voltage):





Camshaft Position Sensor Range Check (High voltage):





VVT sensor range check (While starting engine):





VVT sensor range check (After starting engine):





VVT sensor range check (Chattering):





VVT sensor range check (Low voltage):





VVT sensor range check (High voltage):





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. CHECK ECM TERMINAL VOLTAGE




(a) Inspect the ECM using an oscilloscope.
(1) While the engine is idling, check the waveform of the ECM connector.
OK:





OK -- REPLACE ECM

NG -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (VVT SENSOR - ECM)




(a) Disconnect the V3 or V4 VVT sensor connector.
(b) Disconnect the E4 or E6 ECM connector.
(c) Measure the resistance.
Standard resistance (Check for open):





Standard resistance (Check for short):





(d) Reconnect the VVT sensor connector.
(e) Reconnect the ECM connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

3. CHECK VVT SENSOR (SENSOR POWER SOURCE)




(a) Disconnect the V3 or V4 VVT sensor connector.
(b) Measure the voltage between the terminals of the VVT sensor.
Standard voltage:





(c) Reconnect the VVT sensor connector.

NG -- REPAIR OR REPLACE ECM
OK -- Continue to next step.

4. CHECK SENSOR INSTALLATION (VVT SENSOR)
(a) Check the VVT sensor installation.
OK:
Sensor is installed correctly.

NG -- REPAIR OR REPLACE VVT SENSOR
OK -- Continue to next step.

5. CHECK CAMSHAFT TIMING GEAR ASSEMBLY (TEETH OF PLATE)
(a) Check the teeth of the signal plate.
OK:
Sensor plate teeth do not have any cracks or deformation.

NG -- REPLACE CAMSHAFT TIMING GEAR ASSEMBLY
OK -- REPLACE ECM