Operation CHARM: Car repair manuals for everyone.
Home >> Lexus Truck >> 2011 >> LX 570 V8-5.7L (3UR-FE) >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> P Code Charts >> P0335

P0335





3UR-FE ENGINE CONTROL: SFI SYSTEM: P0335, P0337-P0339: Crankshaft Position Sensor "A" Circuit


DESCRIPTION

The crankshaft position (CKP) sensor system consists of a crankshaft position sensor plate and Magnetic Resistance Element (MRE) type sensor. The crankshaft position sensor plate has 34 teeth at 10° intervals (2 teeth are missing for detecting top dead center), and is installed to the rear end of the crankshaft. The crankshaft position sensor outputs 34 rotation signals per crankshaft revolution. The ECM uses the G2 signal to distinguish between the cylinders, and uses the NE signal to detect the crankshaft position and engine speed.





- Reference: Inspection using an oscilloscope.





Standard:





HINT
G2 stands for the camshaft position 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 crankshaft revolving, the ECM interprets this as a malfunction of the sensor.

When the sensor output voltage remains at less than 0.3 V, or more than 4.7 V for more than 4 seconds, the ECM stores DTC(s).

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS

All:





P0335 Crankshaft Position Sensor Verify Pulse Input:

CASE 1:





CASE 2:





P0337, P0038 Crankshaft Position Sensor Range Check (Low voltage, High voltage):





TYPICAL MALFUNCTION THRESHOLDS

P0335 Crankshaft Position Sensor Range Check:





P0337 Crankshaft Position Sensor Range Check (Low voltage):





P0338 Crankshaft Position Sensor Range Check (High voltage):





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 operation).

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 [A].

6. Start the engine.

7. Idle the engine for 20 seconds or more [B].

8. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [C].

9. Read the DTCs.

HINT
- If a DTC is output, the system is malfunctioning.
- If a 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, P0338 or P0339.

12. Check the DTC judgment result.





HINT
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [B] and [C] 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
- 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 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 (CKP) sensor. Alternatively, the engine speed may be indicated as less than the actual engine speed, if the CKP sensor output voltage is insufficient.
- Read freeze frame data using the Techstream. Freeze frame data records the engine conditions when malfunctions are detected. 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) and turn the Techstream on.

(c) Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Engine Speed.

(d) Start the engine.

(e) 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 (CKP) sensor circuit.

NG -- INSPECT CRANKSHAFT POSITION SENSOR (SENSOR POWER SOURCE)

OK -- CHECK FOR INTERMITTENT PROBLEMS Check For Intermittent Problems

2. INSPECT CRANKSHAFT POSITION SENSOR (SENSOR POWER SOURCE)





(a) Disconnect the C1 crankshaft position sensor connector.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:





NG -- CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM)
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM)





(a) Disconnect the C1 crankshaft position sensor connector.

(b) Disconnect the C53 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.

OK:

Sensor is installed correctly.

NG -- SECURELY REINSTALL SENSOR Installation
OK -- Continue to next step.

5. CHECK CRANKSHAFT POSITION SENSOR PLATE (TEETH OF SENSOR PLATE)

(a) Check the teeth of 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 (DTC P0335, P0337, P0338 AND/OR P0339)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Clear DTCs Reading and Clearing Diagnostic Trouble Codes.

(e) Start the engine.

(f) Refer to the confirmation driving pattern.

(g) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

(h) Read DTCs.

Result





HINT
If the engine does not start, replace the ECM.

B -- REPLACE ECM Removal

A -- END

8. CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM)





(a) Disconnect the C1 crankshaft position sensor connector.

(b) Disconnect the C53 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 -- REPLACE ECM Removal
pro multis · About Operation CHARM