SFI System
2GR-FE ENGINE CONTROL: SFI SYSTEM: P0335, P0339: Crankshaft Position Sensor "A" Circuit
DESCRIPTION
The crankshaft position sensor system consists of a crank angle sensor plate (crankshaft) and a pickup coil. The crank angle sensor plate has 34 teeth at 10° intervals (2 teeth are missing for detecting top dead center), and is installed on the crankshaft.
The crankshaft position sensor generates 34 signals per crankshaft revolution. Based on these signals, the ECM calculates the crankshaft position and engine speed. Using these calculations, the fuel injection and ignition timing are controlled.
- Reference: Inspection using an oscilloscope
HINT
* The correct waveform is as shown.
* VV1+ and VV2+ stand for the VVT sensor (for intake camshaft) signal, and NE+ stands for the crankshaft position sensor signal.
* Grounding failure of the shielded wire may cause a noisy waveform.
MONITOR DESCRIPTION
If there is no signal from the crankshaft position sensor despite the crankshaft rotating, the ECM interprets this as a malfunction of the sensor.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
All
P0335: Crankshaft Position Sensor Range Check/Rationality
P0335: Crankshaft Position Sensor Verify Pulse Input (Case 1)
P0335: Crankshaft Position Sensor Verify Pulse Input (Case 2)
TYPICAL MALFUNCTION THRESHOLDS
P0335: Crankshaft Position Sensor Range Check/Rationality
P0335: Crankshaft Position Sensor Verify Pulse Input
COMPONENT OPERATING RANGE
CONFIRMATION DRIVING PATTERN
1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
4. Turn the engine switch off and wait for at least 30 seconds.
5. Turn the engine switch on (IG) and turn the Techstream on.
6. Start the engine.
7. Idle the engine for 20 seconds or more [A].
8. Enter the following menus: Powertrain / Engine / Trouble Codes [B].
9. Read the pending DTCs.
HINT
* If a pending DTC is output, the system is malfunctioning.
* If a pending DTC is not output, perform the following procedure.
10. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
11. Input the DTC: P0335 or P0339.
12. Check the DTC judgment result.
HINT
* If the judgment result shows NORMAL, the system is normal.
* If the judgment result shows ABNORMAL, the system has a malfunction.
* If the judgment result shows INCOMPLETE or N/A, perform steps [A] and [B] again.
13. If no pending DTC is output, perform a universal trip and check for permanent DTCs Reading and Clearing Diagnostic Trouble Codes.
HINT
* If a permanent DTC is output, the system is malfunctioning.
* If no permanent DTC is output, the system is normal.
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT
* After performing the inspection procedure for the crankshaft position sensor, if DTC P0335 is output again, check the following items related to the VVT sensor.
* Installation condition of the VVT sensor
* Installation condition of the camshaft
* Connection of the VVT sensor connector
* If no problem is found through this diagnostic troubleshooting procedure, troubleshoot the engine mechanical system.
* The engine speed can be checked by using the Techstream. To perform the check, follow the procedures below:
(1) Connect the Techstream to the DLC3.
(2) Start the engine.
(3) Turn the Techstream on.
(4) Enter the following menus: Powertrain / Engine / Data List / Primary / Engine Speed.
* The engine speed may be indicated as zero despite the engine running normally. This is caused by a lack of NE signals from the crankshaft position sensor. Alternatively, the engine speed may be indicated as lower than the actual engine speed if the crankshaft position 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 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 SPEED)
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine / Data List / Primary / Engine Speed.
(e) Start the engine.
(f) Read the values displayed on the Techstream while the engine is running.
Standard:
Correct values are displayed.
HINT
* To check the engine speed change, display the graph on the Techstream.
* If the engine does not start, check the engine speed while cranking.
* If the engine speed indicated on the Techstream remains zero (0), there may be an open or short in the crankshaft position sensor circuit.
NG -- INSPECT CRANKSHAFT POSITION SENSOR
OK -- CHECK FOR INTERMITTENT PROBLEMS Check for Intermittent Problems
2. INSPECT CRANKSHAFT POSITION SENSOR
(a) Inspect the crankshaft position sensor Testing and Inspection.
NG -- REPLACE CRANKSHAFT POSITION SENSOR Removal
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM)
(a) Disconnect the crankshaft position sensor connector.
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
4. CHECK SENSOR INSTALLATION (CRANKSHAFT POSITION SENSOR)
(a) Check the crankshaft position sensor installation condition.
OK:
Crankshaft position sensor is installed correctly.
NG -- SECURELY REINSTALL CRANKSHAFT POSITION SENSOR Installation
OK -- Continue to next step.
5. INSPECT CRANKSHAFT (TEETH OF CRANK ANGLE SENSOR PLATE)
(a) Inspect the teeth of the crank angle sensor plate.
OK:
Crank angle sensor plate does not have any cracks or deformation.
NG -- REPLACE CRANKSHAFT Disassembly
OK -- REPLACE ECM Removal