P0335
2GR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0335, P0339: Crankshaft Position Sensor "A" Circuit
DESCRIPTION
The crankshaft position sensor system consists of a crankshaft position 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 as each tooth passes through the pickup coil, and 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 in the illustration.
* VV1+ and VV2+ stand for the VVT sensor signal, and NE+ stands for the crankshaft position sensor signal.
MONITOR DESCRIPTION
If there is no signal from the crankshaft position sensor despite the engine revolving, 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:
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
Crankshaft Position Sensor Range Check/Rationality
Crankshaft Position Sensor Verify Pulse Input
COMPONENT OPERATING RANGE
WIRING DIAGRAM
CONFIRMATION DRIVING PATTERN
1. Connect the Techstream to the DLC3.
2. Turn the ignition switch on (IG) and turn the Techstream on.
3. Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).
4. Turn the ignition switch off and wait for at least 30 seconds.
5. Turn the ignition 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 and ECT / 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 and ECT / Utility / All Readiness.
11. Input the DTC: P0335, P0337 or P0338.
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 UNKNOWN, perform steps [A] through [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.
INSPECTION PROCEDURE
HINT
* If no problem is found by this diagnostic troubleshooting procedure, check for problems by referring to the engine mechanical section.
* 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 and ECT / Data List / All Data / 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 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 (RESISTANCE)
(a) Disconnect the crankshaft position sensor connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
Text in Illustration
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 Components
OK -- Continue to next step.
2. 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:
Check for open
Check for short
(d) Reconnect the ECM connector.
(e) Reconnect the crankshaft position sensor connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM)
OK -- Continue to next step.
3. CHECK SENSOR INSTALLATION (CRANKSHAFT POSITION SENSOR)
(a) Check the crankshaft position sensor installation condition.
OK:
Sensor is installed correctly.
NG -- REPAIR OR REPLACE CRANKSHAFT POSITION SENSOR Components
OK -- Continue to next step.
4. CHECK CRANKSHAFT POSITION SENSOR PLATE (TEETH OF SENSOR PLATE)
(a) Remove the crankshaft position sensor plate Disassembly.
(b) Check the teeth of the sensor plate.
OK:
Sensor plate does not have any cracks or deformation.
(c) Reinstall the crankshaft position sensor plate Reassembly.
NG -- REPLACE CRANKSHAFT POSITION SENSOR PLATE Components
OK -- REPLACE ECM Components