SFI SYSTEM, Diagnostic DTC:P0335, P0339

DTC Code DTC Name
P0335 Crankshaft Position Sensor "A" Circuit
P0339 Crankshaft Position Sensor "A" Circuit Intermittent

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.

DTC No. DTC Detection Condition Trouble Area
P0335

  • No crankshaft position sensor signal to ECM while cranking (1 trip detection logic)

  • No crankshaft position sensor signal to ECM at engine speed of 600 rpm or more (1 trip detection logic)

  • Open or short in crankshaft position sensor circuit

  • Crankshaft position sensor

  • Sensor plate (Crankshaft position sensor plate)

  • ECM
P0339

Under conditions (a), (b) and (c), no crankshaft position sensor signal to ECM for 0.05 seconds or more (1 trip detection logic):

(a) Engine speed 1000 rpm or more

(b) Starter signal OFF

(c) 3 seconds or more have lapsed since starter signal switched from ON to OFF

  • Open or short in crankshaft position sensor circuit

  • Crankshaft position sensor

  • Sensor plate (Crankshaft position sensor plate)

  • ECM

Reference: Inspection using an oscilloscope

A017D3DE09

Tech Tips


  • 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.

    Item Content
    Terminals

    VV1+ - VV1-

    VV2+ - VV2-

    NE+ - NE-
    Equipment Settings 5 V/DIV., 20 ms./DIV.
    Conditions Cranking or idling

WIRING DIAGRAM

A017F5FE09

INSPECTION PROCEDURE

Tech Tips


  • If no problem is found by this diagnostic troubleshooting procedure, troubleshoot the engine mechanical systems.

  • Check the engine speed. The engine speed can be checked by using the intelligent tester. Perform the following procedure:


    1. Connect the intelligent tester to the DLC3.

    2. Start the engine.

    3. Turn the tester on.

    4. Select the following menu items: Powertrain / Engine and ECT / Data List / Engine Speed.

      The engine speed may be indicated as zero despite the engine revolving 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 voltage output is insufficient.

  • Read freeze frame data using the intelligent tester. 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)


    1. A017FI0E06

      Disconnect the crankshaft position sensor connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance
      Tester Connection Condition Specified Condition
      1 - 2 Cold 1630 to 2470 Ω
      1 - 2 Hot 2065 to 3225 Ω

      Tech Tips

      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).

    3. Reconnect the crankshaft position sensor connector.


    NG

    REPLACE CRANKSHAFT POSITION SENSOR Click here

    OK

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


    1. A017CG9E02

      Disconnect the crankshaft position sensor connector.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance (Check for open)
      Tester Connection Condition Specified Condition
      B21-1 (NE+) - B3-21 (NE+) Always Below 1 Ω
      B21-2 (NE-) - B3-20 (NE-) Always Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Condition Specified Condition
      B21-1 (NE+) or B3-21 (NE+) - Body ground Always 10 kΩ or higher
      B21-2 (NE-) or B3-20 (NE-) - Body ground Always 10 kΩ or higher

    4. Reconnect the ECM connector.

    5. Reconnect the crankshaft position sensor connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK SENSOR INSTALLATION (CRANKSHAFT POSITION SENSOR)


    1. A017C02E54

      Check the crankshaft position sensor installation condition.

      OK
      Sensor is installed correctly.

    NG

    REPAIR OR REPLACE CRANKSHAFT POSITION SENSOR Click here

    OK

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


    1. Remove the crankshaft position sensor plate Click here.

    2. Check the teeth of the sensor plate.

      OK
      Sensor plate does not have any cracks or deformation.

    3. Reinstall the crankshaft position sensor plate Click here.


    NG

    REPLACE CRANKSHAFT POSITION SENSOR PLATE Click here

    OK

    REPLACE ECM Click here