P0339

2TR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0335: 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 by 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.









Reference: Inspection using an oscilloscope

HINT:
- The correct waveform is shown on the left.
- G2 stands for the Camshaft Position (CMP) 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





Crankshaft Position Sensor Range Check during Cranking P0335:





Crankshaft Position Sensor Range Check during Engine Running P0335:





TYPICAL MALFUNCTION THRESHOLDS

Crankshaft Position Sensor Range Check during Cranking P0335:





Crankshaft Position Sensor Range Check during Engine Running P0335:





COMPONENT OPERATING RANGE





WIRING DIAGRAM





INSPECTION PROCEDURE

HINT:
- Check the engine speed. The engine speed can be checked by using the Techstream. To check, follow the operation below:
(a) Connect the Techstream to the DLC3.
(b) Start the engine.
(c) Turn the tester ON.
(d) Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Engine Speed.
The engine speed may be indicated as zero despite the engine revolving normally. This is caused by a lack of NE signals from the Crankshaft Position (CKP) sensor. Alternatively, the engine speed may be indicated as lower than the actual engine speed, if the CKP sensor voltage output is insufficient.
- Read freeze frame data using the Techstream. Freeze frame data records 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 C5 Crankshaft Position (CKP) sensor connector.
(b) Measure the resistance between terminals 1 and 2.
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 C5 CKP sensor connector.
(b) Disconnect the E4 ECM connector.
(c) Check the resistance.
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 CRANKSHAFT POSITION SENSOR (SENSOR INSTALLATION)





(a) Check the CKP sensor installation.
OK:
Sensor is installed correctly.
NG -- SECURELY REINSTALL SENSOR
OK -- Continue to next step.
4. CHECK CRANKSHAFT TIMING PULLEY (TEETH OF PLATE)
(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