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 input speed sensor NT detects the rotation speed of the turbine, which indicates the input shaft revolution (speed) of the transaxle. By comparing the input speed sensor NT signal with the output speed sensor NC signal, the ECM detects the shift timing of the gears and appropriately controls the engine torque and hydraulic pressure according to various conditions, thus, providing smooth gear shifts.

B0083LNC01
*1 Counter Gear *2 C2 Piston
*3 Output Speed Sensor NC *4 Input Speed Sensor NT
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 engine switch is on (IG).

  • The starter is off.

  • The input speed sensor NT input voltage is more than 1.9 V for 4.5 seconds.

  • Wiring harness connector

  • Transmission revolution sensor (Input speed sensor NT)

  • Transmission wire

  • 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 engine switch is on (IG).

  • The starter is off.

  • The input speed sensor NT input voltage is less than 0.1 V for 4.5 seconds or more.

  • Wiring harness connector

  • Transmission revolution sensor (Input speed sensor NT)

  • Transmission wire

  • 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 vehicle is being driven with the shift lever in D (not in 1st gear).

  • The output shaft speed is 580 rpm or more.

  • The vehicle speed is 18 km/h (11 mph) or more.

  • The speed indicated by the input speed sensor NT is less than 300 rpm for 5 seconds or more.

  • Wiring harness connector

  • Transmission revolution sensor (Input speed sensor NT)

  • Transmission wire

  • ECM

 Comes on DTC stored

SAE Code:

P0717

MONITOR DESCRIPTION

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

While the vehicle is being driven in 2nd, 3rd, 4th, 5th or 6th gear with the shift lever in D, if the input shaft revolution (speed) is less than 300 rpm*1 and the output shaft revolution (speed) is more than 580 rpm*2, the ECM interprets this as a malfunction, illuminates the MIL and stores a DTC.

*1: Pulse is not output or is irregularly output.

*2: The vehicle speed is 18 km/h (11 mph) or more.

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 engine switch on (IG) and turn the GTS on.

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

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

  5. Turn the engine switch on (IG) and turn the GTS on.

  6. Start the engine.

  7. Perform the D Position Shift Test inspection in Road Test and drive the vehicle for 5 seconds or more at 18 km/h (11 mph) or more.

    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

B00894XE03

CAUTION / NOTICE / HINT

Note

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

Click here

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. 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.


    1. Warm up the engine.

    2. Turn the engine switch off.

    3. Connect the GTS to the DLC3.

    4. Turn the engine switch on (IG).

    5. Turn the GTS on.

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

    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 turbine speed

      Min.: 0 rpm

      Max.: 12750 rpm

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

      • Nearly equal to engine speed: Lock-up off (engine 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 (NT SENSOR SPEED AND NT SENSOR VOLTAGE)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Transmission / Data List.

    5. According to the display on the GTS, read the Data List.


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

      Min.: 0 rpm

      Max.: 12750 rpm

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

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

      		 Data is displayed in increments of 50 rpm.
      NT Sensor Voltage Input speed sensor NT output voltage

      Min.: 0.000 V

      Max.: 4.999 V

      		 0.1 to 1.9 V -

      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

    REPLACE ECM Click here

    B

  2. INSPECT TRANSMISSION REVOLUTION SENSOR (NT)


    1. B0085IZC05
      *a

      Front view of wire harness connector

      (to Wiring Harness Connector)

      Disconnect the C54 wiring harness connector connector.

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

      Standard Resistance:
      Tester Connection Condition Specified Condition
      C54-2 (NTO) - Body ground Always 99 to 101 Ω

    3. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      C54-1 (NTB) - Body ground Engine switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (ECM - WIRING HARNESS CONNECTOR) Click here

    OK

  3. INSPECT WIRING HARNESS CONNECTOR


    1. Remove the wiring harness connector.

      Click here

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

      B0086V9C34
      *1 Wiring Harness Connector - -
      *a Transmission wire side *b ECM side
      Standard Resistance
      Tester Connection Condition Specified Condition
      C54-1 (NTB) - A-1 (NTB) Always Below 1 Ω
      C54-2 (NTO) - A-2 (NTO) Always Below 1 Ω
      C54-1 (NTB) or A-1 (NTB) - Other terminals Always 10 kΩ or higher
      C54-2 (NTO) or A-2 (NTO) - Other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE WIRING HARNESS CONNECTOR Click here

    OK

  4. INSPECT TRANSMISSION REVOLUTION SENSOR (SPEED SENSOR INSTALLATION)


    1. Remove the transmission valve body assembly.

      Click here

    2. B0086WG

      Make sure that the connector is properly connected, and check the transmission revolution sensor installation.

      Click here

      OK
      The installation bolts are tightened properly and there is no clearance between the transmission revolution sensor and transmission valve body assembly.
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE TRANSMISSION REVOLUTION SENSOR Click here

    OK

  5. INSPECT TRANSMISSION WIRE


    1. B0085QLC01
      *a

      Component without harness connected

      (Transmission Wire)
      *b Wiring harness connector side
      *c Transmission revolution sensor side

      Disconnect the transmission revolution sensor connector from the transmission wire.

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

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

    OK

    REPLACE TRANSMISSION REVOLUTION SENSOR Click here

    NG

    REPLACE TRANSMISSION WIRE Click here

  6. CHECK HARNESS AND CONNECTOR (ECM - WIRING HARNESS CONNECTOR)


    1. Disconnect the C58 ECM connector.

    2. Disconnect the C54 wiring harness connector connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C54-1 (NTB) - C58-71 (NTB) Always Below 1 Ω
      C54-2 (NTO) - C58-72 (NTO) Always Below 1 Ω
      C54-1 (NTB) or C58-71 (NTB) - Body ground and other terminals Always 10 kΩ or higher
      C54-2 (NTO) or C58-72 (NTO) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR