P0339

2AZ-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 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.









Reference: Inspection using an oscilloscope.
HINT:
- The correct waveform is shown.
- 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 although the engine is running, 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, perform the operations below:
(a) Connect the Techstream to the DLC3.
(b) Start the engine.
(c) Turn the Techstream on.
(d) If using the Techstream, enter the following menus: Powertrain / Engine and ECT / Data List / 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. 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 C3 crankshaft position 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 crankshaft position sensor connector.
NG -- REPLACE CRANKSHAFT POSITION SENSOR
OK -- Continue to next step.
2. CHECK WIRE HARNESS (CRANKSHAFT POSITION SENSOR - ECM)




(a) Disconnect the C3 crankshaft position sensor connector.
(b) Disconnect the E8 ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:





(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 the crankshaft position sensor installation.
OK:
Sensor is installed correctly.
NG -- TIGHTEN 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 cranks or deformation.
NG -- REPLACE CRANKSHAFT POSITION SENSOR PLATE
OK -- REPLACE ECM