P0335

3MZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0335: Crankshaft Position Sensor "A" Circuit

DTC P0335 - Crankshaft Position Sensor "A" Circuit

DESCRIPTION

The crankshaft position sensor (NE signal) consists of a magnet, iron core and pickup coil.
The NE signal plate (crankshaft position sensor plate) has 34 teeth and is installed on the crankshaft. The NE signal sensor generates 34 signals for each engine revolution. This sensor monitors a plate (timing rotor) located on the crankshaft timing pulley and is used by the ECM (included in the hybrid vehicle control ECU) to detect crankshaft angle and engine speed (RPM/NE). As the crankshaft timing pulley rotates through an engine revolution, this sensor communicates the rotation of the NE signal plate as a pulse signal to the ECM. Based on the signal, the ECM controls fuel injection duration and ignition timing.






Reference: Inspection using an oscilloscope.





HINT:
- The correct waveform is as shown in the illustration.
- VV1+ and VV2+ stand for the VVT sensor signal, and NE+ stands for the crankshaft position sensor signal.





MONITOR DESCRIPTION

If there is no signal from the crankshaft position sensor despite the engine rotating, the ECM (included in the hybrid vehicle control ECU) interprets this as a malfunction of the sensor.
If the malfunction is not repaired successfully, these DTCs are set 10 seconds after the engine is next started.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





WIRING DIAGRAM





INSPECTION PROCEDURE
HINT:
- If no problem is found by this diagnostic troubleshooting procedure, troubleshoot the engine mechanical system.
- Check the engine speed. The engine speed can be checked by using the Techstream. To check, follow the operation below:
1. Connect the Techstream to the DLC3.
2. Put the engine in inspection mode Component Tests and General Diagnostics.
3. Start the engine.
4. Turn the Techstream on.
5. Enter the following menus: Powertrain / Engine and ECT / Data List / Engine Speed.
- 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 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 CRANKSHAFT POSITION SENSOR





(a) Disconnect the crankshaft position sensor connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:





(c) Reconnect the crankshaft position sensor connector.
NG -- REPLACE CRANKSHAFT POSITION SENSOR
OK -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - HYBRID VEHICLE CONTROL ECU)





(a) Disconnect the crankshaft position sensor connector.
(b) Disconnect the hybrid vehicle control ECU connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance (Check for open):






Standard resistance (Check for short):





(d) Reconnect the hybrid vehicle control ECU connector.
(e) Reconnect the crankshaft position sensor connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (CRANKSHAFT POSITION SENSOR - HYBRID VEHICLE CONTROL ECU)
OK -- Continue to next step.
3. CHECK SENSOR INSTALLATION (CRANKSHAFT POSITION SENSOR)





(a) Check the crankshaft position sensor installation condition.
OK:
Sensor is installed correctly.
NG -- REPAIR OR REPLACE CRANKSHAFT POSITION SENSOR
OK -- Continue to next step.
4. CHECK CRANKSHAFT POSITION SENSOR PLATE (TEETH OF SENSOR PLATE)
(a) Remove the crankshaft position sensor plate Disassembly.
(b) Check the teeth on the sensor plate.
OK:
Sensor plate does not have any crack or deformation.
(c) Reinstall the crankshaft position sensor plate Reassembly.
NG -- REPLACE CRANKSHAFT POSITION SENSOR PLATE
OK -- REPLACE HYBRID VEHICLE CONTROL ECU