P0339

3UZ-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 sensor system consists of a crankshaft position sensor plate and a magnetic 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: Inspection using an oscilloscope.
The correct waveform is as shown.






MONITOR DESCRIPTION

If there is no signal from the crankshaft position sensor even though the engine is running, the ECM interprets this as a malfunction of the sensor.
This monitor runs for 10 seconds (the first 10 seconds of engine idle) after the engine is started.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS

Crankshaft position sensor signal check when starter OFF Case 1:





Crankshaft position sensor signal check when starter OFF Case 2:





Crankshaft position sensor signal check when starter ON:





TYPICAL MALFUNCTION THRESHOLDS

Crankshaft position sensor signal check when starter OFF Case 1:





Crankshaft position sensor signal check when starter OFF Case 2:





Crankshaft position sensor signal check when starter ON:





COMPONENT OPERATING RANGE





WIRING DIAGRAM





INSPECTION PROCEDURE
HINT:
- Read freeze frame data using the Techstream. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, 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.
- The engine speed can be confirmed in the Data List using the Techstream. Enter the following menus: Powertrain / Engine and ECT / Data List / Engine Speed. If no NE signals are sent from the crankshaft position sensor even though the engine is running, the engine speed will be indicated as zero. If the output voltage of the crankshaft position sensor is insufficient, the engine speed will be indicated as lower than the actual RPM.

PROCEDURE

1. INSPECT CRANKSHAFT POSITION SENSOR




(a) Disconnect the C6 crankshaft position sensor connector.
(b) Measure the resistance of the sensor.
Standard resistance:





NOTE:
In the above section, the 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).
NG -- REPLACE CRANKSHAFT POSITION SENSOR
OK -- Continue to next step.
2. CHECK WIRE HARNESS (CRANKSHAFT POSITION SENSOR - ECM)




(a) Disconnect the C6 crankshaft position sensor connector.
(b) Disconnect the E2 ECM connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS AND 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 CRANKSHAFT TIMING PULLEY (TEETH OF PLATE)
(a) Check the teeth of the crankshaft timing pulley.
OK:
Timing pulley's teeth have no deformation or cracks.
NG -- REPLACE CRANKSHAFT TIMING PULLEY
OK -- REPLACE ECM