P0335

1NZ-FXE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0335: Crankshaft Position Sensor "A" Circuit

DTC P0335 - Crankshaft Position Sensor "A" Circuit

DESCRIPTION

The crankshaft position sensor (CKP) system consists of a crankshaft position sensor plate and a pick-up coil. The sensor plate has 34 teeth and is installed on the crankshaft. The pick-up coil is made of an iron core and magnet. The sensor plate rotates and as each tooth passes through the pick-up coil, a pulse signal is created. The pick-up coil generates 34 signals per engine revolution. Based on these signals, the ECM calculates the crankshaft position and engine RPM. Using these calculations, the fuel injection time and ignition timing are controlled.






Reference: Inspection using an oscilloscope.




HINT: The correct waveform is as shown.





MONITOR DESCRIPTION

If there is no signal from the crankshaft sensor even though the engine is running, the ECM interprets this as a malfunction of the sensor.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





WIRING DIAGRAM





INSPECTION PROCEDURE
HINT:
- Perform troubleshooting for DTC P0335 first. If no trouble is found, troubleshoot the engine mechanical systems.
- Read freeze frame data using 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 Freeze Frame Data.
- Read the values using Techstream.
1 Connect Techstream to the DLC3.
2 Turn the power switch ON (IG).
3 Turn Techstream ON.
4 Put the engine in inspection mode Service Precautions.
5 Start the engine.
6 Enter the following menus: Powertrain / Engine and ECT / Data List / Engine Speed.
7 Read the value.
- The engine speed can be observed in Data List using Techstream. If there is no NE signal from the crankshaft position sensor even though the engine is running, the engine speed will be indicated as zero. If voltage output from the crankshaft position sensor is insufficient, the engine speed will be indicated as lower PRM (than the actual RPM).

PROCEDURE

1. INSPECT CRANKSHAFT POSITION SENSOR (RESISTANCE)




(a) Disconnect the C7 crankshaft position sensor connector.
(b) Measure the resistance between the terminals of the crankshaft position sensor connector.
Standard resistance:





NOTE: 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 crankshaft position sensor connector.
NG -- REPLACE CRANKSHAFT POSITION SENSOR
OK -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM)




(a) Disconnect the C7 crankshaft position sensor connector.




(b) Disconnect the E4 ECM 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 crankshaft position sensor connector.
(e) Reconnect the ECM connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

3. CHECK SENSOR INSTALLATION (CRANKSHAFT POSITION SENSOR)
(a) Check that the crankshaft position sensor is properly installed.
OK:
Sensor is installed correctly.
NG -- SECURELY REINSTALL SENSOR
OK -- Continue to next step.

4. CHECK CRANKSHAFT POSITION SENSOR PLATE (TEETH OF SENSOR PLATE [CRANKSHAFT])
(a) Check the teeth of the sensor plate.
OK:
No deformation on the teeth of the sensor plate.
NG -- REPLACE CRANKSHAFT POSITION SENSOR PLATE
OK -- REPLACE ECM