P0335

2AZ-FXE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0335: Crankshaft Position Sensor "A" Circuit

DTC P0335 - Crankshaft Position Sensor "A" Circuit

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 wound copper wire, an iron core and 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 (included in the hybrid vehicle control ECU) calculates the crankshaft position and engine RPM. Using these calculations, the fuel injection duration and ignition timing are controlled.





- Reference: Inspection using an oscilloscope.




HINT:
- The correct waveform is as shown.
- G2+ stands for the Camshaft Position (CMP) sensor signal, and NE+ stands for the CKP sensor signal.
- A failure of the ground for the shielding of the wiring may result in noisy waveforms.






MONITOR DESCRIPTION

If there is no signal from the CKP sensor despite the engine revolving, the ECM (included in the hybrid vehicle control ECU) 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 through this diagnostic troubleshooting procedure, troubleshoot the engine mechanical system.
- Check the engine speed. The engine speed can be checked using the Techstream. To check, follow the operation below:
1. Connect the Techstream to the DLC3.
2. Put the engine in inspection mode Component Tests and General Diagnostics.
3. Turn the tester on.
4. Select the following menu items: Powertrain / Engine / Data List / All Data / Engine Speed.
- Read freeze frame data using the Techstream. The ECM (included in the hybrid vehicle control ECU) records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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. READ VALUE USING TECHSTREAM (ENGINE SPD)
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Turn the tester on.
(d) Select the following menu items: Powertrain / Engine / Data List / All Data / Engine Speed.
(e) Put the engine in inspection mode Component Tests and General Diagnostics.
(f) Read the values displayed on the tester while the engine is running.
Standard:
Correct values are displayed.
HINT:
- To check the engine speed change, display the graph on the tester.
- If the engine does not start, check the engine speed while cranking.
- If the engine speed indicated on the tester remains zero (0), there may be an open or short in the Crankshaft Position (CKP) sensor circuit.

OK -- CHECK FOR INTERMITTENT PROBLEMS
NG -- Continue to next step.
2. INSPECT CRANKSHAFT POSITION SENSOR (RESISTANCE)




(a) Disconnect the C20 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 sensor. "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.
3. CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - HYBRID VEHICLE CONTROL ECU)




(a) Disconnect the C20 CKP sensor connector.
(b) Disconnect the C64 hybrid vehicle control ECU connector.
(c) Measure the resistance.
Standard resistance (Check for open):






Standard resistance (Check for short):





(d) Reconnect the hybrid vehicle control ECU connector.
(e) Reconnect the CKP sensor connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
4. 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.
5. CHECK CRANKSHAFT POSITION SENSOR PLATE (TEETH OF SENSOR PLATE)
(a) Check the teeth on the sensor plate.
OK:
Sensor plate does not have any cracks or deformation.
NG -- REPLACE CRANKSHAFT POSITION SENSOR PLATE
OK -- Continue to next step.
6. REPLACE CRANKSHAFT POSITION SENSOR
(a) Replace the crankshaft position sensor Removal.
NEXT -- Continue to next step.
7. CHECK WHETHER DTC OUTPUT RECURS
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Turn the tester on.
(d) Clear the DTCs DTC Check / Clear.
(e) Put the engine in inspection mode Component Tests and General Diagnostics.
(f) Select the following menu items: Powertrain / Engine / Trouble Code.
(g) Read the DTCs.
Result:





HINT: If the engine does not start, replace the hybrid vehicle control ECU.

B -- REPLACE HYBRID VEHICLE CONTROL ECU
A -- END