P0335
2ZR-FE ENGINE CONTROL: 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 wound copper wire, 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 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 as shown.
- G2+ and EV1+ are camshaft position sensor signals, and NE+ is the crankshaft position 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 crankshaft position sensor despite the engine rotating, 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
All:
Case 1
Case 1:
Case 2
Case 2:
TYPICAL MALFUNCTION THRESHOLDS
Case 1
Case 1:
Case 2
Case 2:
COMPONENT OPERATING RANGE
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT
- If no problem is found through this diagnostic troubleshooting procedure, troubleshoot the engine mechanical systems.
- 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) Start the engine.
(3) Turn the Techstream on.
(4) Enter the following menus: Powertrain / Engine and ECT / Data List / Engine Speed.
* The engine speed may be indicated as zero despite the engine rotating 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. READ VALUE USING TECHSTREAM (ENGINE SPEED)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine and ECT / Data List / Engine Speed.
(e) Start the engine.
(f) Read the values displayed on the Techstream while the engine is running.
OK:
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 at zero (0), there may be an open or short in the crankshaft position sensor circuit.
NG -- INSPECT CRANKSHAFT POSITION SENSOR (RESISTANCE)
OK -- CHECK FOR INTERMITTENT PROBLEMS Check for Intermittent Problems
2. 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:
(c) Reconnect the crankshaft position sensor connector.
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 (Check for Open):
Standard Resistance (Check for Short):
(d) Reconnect the crankshaft position sensor connector.
(e) Reconnect the ECM connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM)
OK -- Continue to next step.
4. CHECK SENSOR INSTALLATION (CRANKSHAFT POSITION SENSOR)
(a) Check the crankshaft position sensor installation.
OK:
Sensor is installed correctly.
NG -- SECURELY REINSTALL SENSOR Installation
OK -- Continue to next step.
5. INSPECT NO. 1 CRANKSHAFT POSITION SENSOR PLATE (TEETH OF SENSOR PLATE)
(a) Check the teeth of the sensor plate Components.
OK:
Sensor plate does not have any cracks or deformation.
NG -- REPLACE NO. 1 CRANKSHAFT POSITION SENSOR PLATE Components
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 ignition switch to ON.
(c) Turn the Techstream on.
(d) Clear DTCs DTC Check / Clear.
(e) Start the engine.
(f) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
(g) Read the DTCs.
Result:
HINT
If the engine does not start, replace the ECM.
B -- REPLACE ECM Removal
A -- END