Lexus NX: Crankshaft Position Sensor "A" Circuit (P0335)

Lexus NX Service Manual / Engine & Hybrid System / 2ar-fxe (engine Control) / Sfi System / Crankshaft Position Sensor "A" Circuit (P0335)

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.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

P0335

Crankshaft Position Sensor "A" Circuit

Either the following conditions is met (1 trip detection logic):

  • No crankshaft position sensor signal to ECM while engine running.
  • Missing crankshaft position sensor signal despite camshaft position sensor signal inputs normal after engine cranked.
  • Open or short in crankshaft position sensor circuit
  • Crankshaft position sensor
  • Crankshaft (crank angle sensor plate)
  • ECM

Comes on

DTC stored

  • Reference: Inspection using an oscilloscope

    HINT:

    • The correct waveform is as shown.
    • NE stands for the crankshaft position sensor signal.
    • Grounding failure of the shielded wire may cause a noisy waveform.

    ECM Terminal Name

    Between NE+ and NE-

    Tester Range

    5 V/DIV., 20 ms./DIV.

    Condition

    Idling with warm engine

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

Related DTCs

P0335: Crankshaft position sensor verify pulse input

P0335: Crankshaft position sensor range check/rationality

Required Sensors/Components (Main)

Crankshaft position sensor

Required Sensors/Components (Related)

Camshaft position sensor

Frequency of Operation

Continuous

Duration

-: Verify pulse input (case 1)

0.164 seconds: Range check/rationality

1.85 seconds: Verify pulse input (case 2)

MIL Operation

Immediate

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

All

Monitor runs whenever the following DTCs are not stored

None

Both of the following conditions are met

-

Lost communication with hybrid vehicle control ECU (U0293)

Not detected

Hybrid control module judge

Engine running

Range Check/Rationality

All of the following conditions are met

-

Crankshaft position sensor

Signal input

Power switch

On (IG)

Time after starter off to on

2.5 seconds or more

Camshaft position sensor circuit fail

Not detected

Number of camshaft position sensor signal pulse

6 times

Auxiliary battery voltage

7 V or higher

Verify Pulse Input (Case 1)

All of the following conditions are met

-

Engine speed

600 rpm or higher

Starter

Off

Time after starter on to off

3 seconds or more

Verify Pulse Input (Case 2)

Both of the following conditions are met

-

Power switch

On (IG)

Time after power switch off to on (IG)

0.5 seconds or more

TYPICAL MALFUNCTION THRESHOLDS

Range Check/Rationality

Number of crankshaft position sensor signal pulse

87 times or less, or 219 times or more

Verify Pulse Input

Crankshaft position sensor signal

No signal

COMPONENT OPERATING RANGE

Crankshaft position sensor

  • Crankshaft position sensor output voltage fluctuates while crankshaft is revolving
  • 34 crankshaft position sensor signals per crankshaft revolution

CONFIRMATION DRIVING PATTERN

  1. Connect the Techstream to the DLC3.
  2. Turn the power 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 power switch off and wait for at least 30 seconds.
  5. Turn the power switch on (IG) and turn the Techstream on.
  6. Put the engine in inspection mode (maintenance mode).

    Click here

  7. Start the engine.
  8. Idle the engine for 20 seconds or more [A].
  9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [B].
  10. 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.
  11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
  12. Input the DTC: P0335.
  13. Check the DTC judgment result.

    Techstream Display

    Description

    NORMAL

    • DTC judgment completed
    • System normal

    ABNORMAL

    • DTC judgment completed
    • System abnormal

    INCOMPLETE

    • DTC judgment not completed
    • Perform driving pattern after confirming DTC enabling conditions

    N/A

    • Unable to perform DTC judgment
    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    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.
  14. If no pending DTC is output, perform a universal trip and check for permanent DTCs.

    Click here

    HINT:

    • If a permanent DTC is output, the system is malfunctioning.
    • If no permanent DTC is output, the system is normal.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

HINT:

  • After performing the inspection procedure for the crankshaft position sensor, if DTC P0335 is output again, check the following items related to the camshaft position sensor.
    • Installation condition of the camshaft position sensor.
    • Installation condition of the camshaft.
    • Connection of the camshaft position 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. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Put the engine in inspection mode (maintenance mode).

      Click here

    5. Start the engine.
    6. Enter the following menus: Powertrain / Engine and ECT / 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 power switch on (IG).

(c) Turn the Techstream on.

(d) Put the engine in inspection mode (maintenance mode).

Click here

Powertrain > Hybrid Control > Utility

Tester Display

Inspection Mode

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

Powertrain > Engine and ECT > Data List

Tester Display

Engine Speed

(f) Start the engine.

(g) 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.
OK

CHECK FOR INTERMITTENT PROBLEMS

NG

2.

INSPECT CRANKSHAFT POSITION SENSOR

(a) Inspect the crankshaft position sensor.

Click here

NG

REPLACE CRANKSHAFT POSITION SENSOR

OK

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:

Tester Connection

Condition

Specified Condition

C38-1 - C48-76 (NE+)

Always

Below 1 Ω

C38-2 - C48-109 (NE-)

Always

Below 1 Ω

C38-1 or C48-76 (NE+) - Body ground

Always

10 kΩ or higher

C38-2 or C48-109 (NE-) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

CHECK SENSOR INSTALLATION (CRANKSHAFT POSITION SENSOR)

*a

Clearance

(a) Check the crankshaft position sensor installation condition.

OK:

Crankshaft position sensor is installed correctly.

NG

SECURELY REINSTALL CRANKSHAFT POSITION SENSOR

OK

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.

OK

REPLACE ECM

NG

REPLACE CRANKSHAFT

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