P0339

2UZ-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 windings, an iron core and 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 for each 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: Inspect using an oscilloscope.
The correct waveform is as shown.






MONITOR DESCRIPTION

If there is no signal from the Crankshaft Position (CKP) sensor even though the engine is revolving, the ECM interprets this as a malfunction of the sensor.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS

Case 1:





Case 2:





Case 1:





Case 2:





TYPICAL MALFUNCTION THRESHOLDS

Case 1:





Case 2:





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 Start the engine.
3 Turn the tester ON.
4 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 output voltage is insufficient.
- 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. INSPECT CRANKSHAFT POSITION SENSOR




(a) Disconnect the C2 Crankshaft Position (CKP) sensor connector.
(b) Measure the resistance of the sensor.
Standard resistance:





HINT: In the above section, the 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 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 C2 crankshaft position sensor connector.
(b) Disconnect the E7 ECM connector.
(c) Measure the resistance between the wire harness side connectors.
Standard resistance (check for open):






Standard resistance (check for short):





(d) Reconnect the CKP 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 the sensor installation.
OK:
Sensor is installed correctly.
NG -- SECURELY REINSTALL SENSOR
OK -- Continue to next step.
4. CHECK NO. 1 CRANKSHAFT POSITION SENSOR PLATE (TOOTH OF PLATE)
(a) Remove the crankshaft position sensor plate No. 1 Removal.
(b) Check the tooth of the signal plate.
OK:
Sensor plate does not have any cracks or deformation.
NG -- REPLACE NO. 1 CRANKSHAFT POSITION SENSOR PLATE
OK -- REPLACE ECM