P0339

1GR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0335,P0339: Crankshaft Position Sensor "A" Circuit

DTC P0335 - Crankshaft Position Sensor "A" Circuit

DTC P0339 - Crankshaft Position Sensor "A" Circuit Intermittent

DESCRIPTION

The Crankshaft Position (CKP) sensor system consists of a CKP sensor plate and a pickup coil. The sensor plate has 34 teeth and is installed on the crankshaft. The pickup coil is made of an iron core and a magnet.
The sensor plate rotates and, as each tooth passes through the pickup coil, a pulse signal is created. The pickup 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.









- Inspection using an oscilloscope
HINT:
- The correct waveform is shown above.
- VV1+ and VV2+ stand for the VVT sensor signal, and NE+ stands for the CKP sensor signal.






MONITOR DESCRIPTION

If there is no signal from the CKP sensor despite the engine revolving, the ECM 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

All





Case 1





Case 2





TYPICAL MALFUNCTION THRESHOLDS

Case 1





Case 2





COMPONENT OPERATING RANGE





WIRING DIAGRAM





INSPECTION PROCEDURE
HINT:
- If no problem is found by this diagnostic troubleshooting procedure, troubleshoot the engine mechanical systems.
- 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. Start the engine.
3. Turn the Techstream on.
4. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Engine Speed.
- Read freeze frame data using the Techstream. Freeze frame data record the engine condition when malfunctions are detected. 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 CRANKSHAFT POSITION SENSOR (RESISTANCE)




(a) Disconnect the Crankshaft Position (CKP) sensor connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:





HINT: 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).
(c) Reconnect the CKP sensor connector.
NG -- REPLACE CRANKSHAFT POSITION SENSOR
OK -- Continue to next step.

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




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

3. CHECK SENSOR INSTALLATION (CRANKSHAFT POSITION SENSOR)




(a) Check the CKP sensor installation.
OK:
Sensor is installed correctly.
NG -- TIGHTEN SENSOR
OK -- Continue to next step.

4. INSPECT CRANKSHAFT POSITION SENSOR PLATE (TEETH OF SENSOR PLATE(CRANKSHAFT))
(a) Check the teeth of the sensor plate.
OK:
Sensor plate does not have any cracks or deformation.
NG -- REPLACE CRANKSHAFT POSITION SENSOR PLATE
OK -- REPLACE ECM