AUTOMATIC TRANSAXLE SYSTEM, Diagnostic DTC:P071512, P071514, P071531

DTC Code DTC Name
P071512 Input/Turbine Speed Sensor "A" Circuit Short to Battery
P071514 Input/Turbine Speed Sensor "A" Circuit Short to Ground or Open
P071531 Input/Turbine Speed Sensor "A" No Signal

DESCRIPTION

The transmission revolution sensor (NT) detects the input shaft rotation speed and sends it to the ECM.

Based on the transmission revolution sensor (NT) signal and the transmission revolution sensor (NC) signals, the ECM controls engine torque and shift timing. Based on the input shaft rotation speed and the engine speed signal, lock-up control is performed.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory Note
P071512 Input/Turbine Speed Sensor "A" Circuit Short to Battery

All of the following conditions are met (1-trip detection logic):


  • The battery voltage is 8 V or more.

  • The ignition switch is ON.

  • The starter is off.

  • Transmission revolution sensor (NT) input voltage is more than 1.9 V for 4.5 seconds.

  • Transmission revolution sensor (NT)

  • Transmission wire

  • Harness and connector

  • ECM

 Comes on DTC stored

SAE Code:

P07C0
P071514 Input/Turbine Speed Sensor "A" Circuit Short to Ground or Open

All of the following conditions are met (1-trip detection logic):


  • The battery voltage is 8 V or more.

  • The ignition switch is ON.

  • The starter is off.

  • Transmission revolution sensor (NT) input voltage is less than 0.1 V for 4.5 seconds or more.

  • Transmission revolution sensor (NT)

  • Transmission wire

  • Harness and connector

  • ECM

 Comes on DTC stored

SAE Code:

P07BF
P071531 Input/Turbine Speed Sensor "A" No Signal

All of the following conditions are met (1-trip detection logic):


  • The battery voltage is 8 V or more.

  • The park/neutral position switch D input signal is ON.

  • The speed indicated by transmission revolution sensor (NC) is 520 rpm or more.

  • The vehicle speed is 22 km/h (14 mph) or more.

  • The vehicle is being driven in 1st, 2nd, 3rd, 4th, 5th, 6th, 7th or 8th gear.

  • The speed indicated by transmission revolution sensor (NT) is less than 300 rpm for 5 seconds or more.

  • Transmission revolution sensor (NT)

  • Transmission wire

  • Harness and connector

  • ECM

 Comes on DTC stored

SAE Code:

P0717

MONITOR DESCRIPTION

The NT terminal of the ECM detects a pulse signal from the transmission revolution sensor (NT) (input RPM). The ECM calculates gear shifts by comparing input signals of the transmission revolution sensor (NT) with the transmission revolution sensor (NC).

While the vehicle is being driven in 1st, 2nd, 3rd, 4th, 5th, 6th, 7th or 8th gear with the shift lever in D, if the input shaft revolution (speed) is less than 300 rpm* when the vehicle speed is 22 km/h (14 mph) or more, the ECM interprets this as a malfunction, illuminates the MIL and stores a DTC.

*: Pulse is not output or is irregularly output.

CONFIRMATION DRIVING PATTERN

CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

Tech Tips

After repairs have been completed, clear the DTCs and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.


  1. Connect the GTS to the DLC3.

  2. Turn the ignition switch to ON and turn the GTS on.

  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

  4. Turn the ignition switch off and wait for 2 minutes or more.

  5. Turn the ignition switch to ON and turn the GTS on.

  6. Start the engine.

  7. Perform the D Position Shift Test inspection in Road Test.

    Click here

  8. Stop the vehicle.

  9. Enter the following menus: Powertrain / Transmission / Utility / All Readiness.

  10. Input the DTC: P071512, P071514 or P071531.

  11. Check the DTC judgment result.

    GTS 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

    Tech Tips


    • 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 the Confirmation Driving Pattern and check the DTC judgment result again.

WIRING DIAGRAM

B0083S8E11
*a Transmission Revolution Sensor (NT)
*b Transmission Wire

CAUTION / NOTICE / HINT

Note

Perform registration and/or initialization when parts related to the automatic transaxle are replaced.

Click here


  1. DATA LIST

    Note

    In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not.

    Tech Tips

    Using the GTS to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may be discovered before parts or wiring is disturbed. Reading the Data List information early in troubleshooting is one way to save diagnostic time.


    1. Warm up the engine.

    2. Turn the ignition switch off.

    3. Connect the GTS to the DLC3.

    4. Turn the ignition switch to ON.

    5. Turn the GTS on.

    6. Enter the following menus: Powertrain / Transmission / Data List / NT Sensor Speed.

    7. Read the Data List according to the display on the GTS.


      Powertrain > Transmission > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      NT Sensor Speed Input shaft speed

      Min.: 0 rpm

      Max.: 12750 rpm

      • Equal to engine speed: Lock-up on (after warming up engine)

      • Nearly equal to engine speed: Lock-up off (idling with shift lever in N)

      		 Data is displayed in increments of 50 rpm

      Powertrain > Transmission > Data List
      Tester Display
      NT Sensor Speed

      Tech Tips


      • NT Sensor Speed is always 0 while driving: Open or short in the sensor or circuit.

      • NT Sensor Speed is always more than 0 and less than 300 rpm while driving the vehicle at 50 km/h (31 mph) or more: Sensor malfunction, improper installation, or intermittent connection malfunction in the circuit.

PROCEDURE


  1. READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Transmission / Data List / NT Sensor Speed and NT Sensor Voltage.

    5. Read the Data List according to the display on the GTS.


      Powertrain > Transmission > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      NT Sensor Speed Input shaft speed

      Min.: 0 rpm

      Max.: 12750 rpm

      • Equal to engine speed: Lock-up on (after warming up engine)

      • Nearly equal to engine speed: Lock-up off (idling with shift lever in N)

      		 Data is displayed in increments of 50 rpm
      NT Sensor Voltage NT sensor voltage

      Min.: 0.000 V

      Max.: 4.999 V

      		 0.1 to 1.9 V: Engine idling -

      Powertrain > Transmission > Data List
      Tester Display
      NT Sensor Speed
      NT Sensor Voltage
      Result
      Result Proceed to
      Data List values are normal A
      Data List values are not normal B

    A

    GO TO STEP 5 Click here

    B

  2. INSPECT TRANSMISSION REVOLUTION SENSOR (NT)


    1. B00870QC10
      *a

      Front view of wire harness connector

      (to Transmission Wire)

      Disconnect the C93 transmission wire connector.

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

      Standard Resistance:
      Tester Connection Condition Specified Condition
      C93-11 (NTO) - Body ground Always 99 to 101 Ω

    3. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      C93-12 (NTB) - Body ground Ignition switch ON 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM) Click here

    OK

  3. INSPECT TRANSMISSION WIRE (TRANSMISSION REVOLUTION SENSOR (NT))


    1. B0088ENC05
      *1 Transmission Wire
      *a Transmission Revolution Sensor (NT) Side
      *b Wire Harness Connector Side

      Disconnect the transmission revolution sensor (NT) connector.

      Click here

    2. Disconnect the C93 transmission wire connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 (transmission revolution sensor (NT) side) - 12 (NTB) (wire harness connector side) Always Below 1 Ω
      2 (transmission revolution sensor (NT) side) - 11 (NTO) (wire harness connector side) Always Below 1 Ω
      1 (transmission revolution sensor (NT) side) or 12 (NTB) (wire harness connector side) - Body ground and other terminals Always 10 kΩ or higher
      2 (transmission revolution sensor (NT) side) or 11 (NTO) (wire harness connector side) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE TRANSMISSION REVOLUTION SENSOR (NT) Click here

    NG

    REPAIR OR REPLACE TRANSMISSION WIRE Click here

  4. CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM)


    1. Disconnect the C93 transmission wire connector.

    2. Disconnect the C59 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C93-12 (NTB) - C59-35 (NTB) Always Below 1 Ω
      C93-11 (NTO) - C59-36 (NTO) Always Below 1 Ω
      C93-12 (NTB) or C59-35 (NTB) - Body ground and other terminals Always 10 kΩ or higher
      C93-11 (NTO) or C59-36 (NTO) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (TRANSMISSION WIRE - ECM)

    OK

  5. REPLACE ECM


    1. Replace the ECM.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    PERFORM REGISTRATION Click here