CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM, Diagnostic DTC:P0715 and P0717

DTC Code DTC Name
P0715 Input/Turbine Speed Sensor "A" Circuit
P0717 Input/Turbine Speed Sensor "A" Circuit No Signal

DESCRIPTION

The ECM receives a signal from the turbine speed sensor (transmission revolution sensor (NT)) installed in the continuously variable transaxle to control the lock-up engagement pressure and forward and reverse clutch pressure.

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

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

P0715

Input/Turbine Speed Sensor "A" Circuit

1. Diagnosis Condition 2. Malfunction Status 3. Malfunction Time 4. Other

  1. A transmission revolution sensor (NT) signal malfunction is not detected.

  2. The transmission revolution sensor (NT) output voltage is less than 0.1 V, or higher than 1.9 V.

  3. 2 seconds

  4. 1 trip detection logic

  • Open or short in transmission revolution sensor (NT) circuit

  • Transmission revolution sensor (NT)

  • ECM

Comes on

DTC stored

P0717

Input/Turbine Speed Sensor "A" Circuit No Signal

1. Diagnosis Condition 2. Malfunction Status 3. Malfunction Time 4. Other

  1. The vehicle is driven with the shift lever in D, the output shaft speed is 300 rpm or more, and no error is detected in the park/neutral position switch.

  2. The speed indicated by the transmission revolution sensor (NT) is less than 300 rpm.

  3. 2 seconds

  4. 1 trip detection logic

  • Open or short in transmission revolution sensor (NT) circuit

  • Transmission revolution sensor (NT)

  • ECM

Comes on

DTC stored

MONITOR DESCRIPTION

The turbine speed sensor detects the transaxle input shaft speed. The ECM determines the necessary gear ratio based on a comparison of the turbine speed sensor (input shaft speed) with the output speed sensor (output shaft speed).

When the output shaft speed is higher than the expected value and the input shaft speed is less than 300 rpm while driving with the shift lever in D, the ECM will conclude that there is a malfunction in the transmission revolution sensor (NT). The ECM will illuminate the MIL and store the DTC.

WIRING DIAGRAM

C277072E01

CAUTION / NOTICE / HINT

Note:

  • Perform initialization when parts related to the continuously variable transaxle are replaced.

    Click here

  • Check that no DTCs are stored after performing initialization.

    Click here

PROCEDURE

  1. READ VALUE USING GTS (SPD (NT) AND NT SENSOR VOLTAGE)

    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 / Engine and ECT / Data List.

      Powertrain > Engine and ECT > Data List

      Tester Display

      SPD (NT)

      NT Sensor Voltage

      Powertrain > Engine and ECT > Data List

      Tester Display

      Measurement Item

      Range

      Normal Condition

      Diagnostic Note

      SPD (NT)

      Input turbine speed

      min.: 0 rpm

      max.: 12750 rpm

      • Lock-up on (After warming up engine): Input turbine speed (NT) equal to engine speed

      • Lock-up off (Idling with shift lever in P or N): Input turbine speed (NT) nearly equal to engine speed

      • Vehicle stopped with shift lever in R: 0 rpm

      Data is displayed in increments of 50 rpm.

      NT Sensor Voltage

      Input turbine speed (NT) sensor output voltage

      min.: 0 V

      max.: 4.999 V

      Engine idling (Vehicle stopped with shift lever in P or N): 0.6 to 1.5 V

      -

    5. In accordance with the display on the GTS, read the Data List.

      Result

      Proceed to

      Data displayed is not as specified under Normal Condition

      Data displayed is as specified under Normal Condition
    Data displayed is as specified under Normal Condition

    REPLACE ECMClick here

    Data displayed is not as specified under Normal Condition

  2. INSPECT TRANSMISSION REVOLUTION SENSOR (NT)

    1. Remove the transmission revolution sensor (NT).

      Click here

      C277851C01

      *1

      Transmission Revolution Sensor (NT)

      *2

      Ammeter

      *3

      Battery

      -

      -

      *a

      5 mm (0.197 in.) Gap or Closer

      -

      -

    2. Connect the battery to the sensor as shown in the illustration.

    3. Wave a magnetic object left and right in front of the transmission revolution sensor (NT) tip (5 mm (0.197 in.) gap or closer) to change the high/low signals while measuring the current.

      Note:

      Make sure to wave the magnetic object during the inspection. The current will not change without waving the magnetic object as indicated by the arrow in the illustration.

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

      Standard Current

      Tester Connection

      Condition

      Specified Condition

      1 (NTO) - 2 (NTB)

      Low signal

      4 to 8 mA

      1 (NTO) - 2 (NTB)

      High signal

      12 to 16 mA

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE TRANSMISSION REVOLUTION SENSOR (NT)

    Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (TRANSMISSION REVOLUTION SENSOR (NT) - ECM)

    1. Disconnect the B33 transmission revolution sensor (NT) connector.

    2. Disconnect the B75 ECM connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      B33-1 (NTO) - B75-125 (NTO)

      Always

      Below 1 Ω

      B33-2 (NTB) - B75-126 (NTB)

      Always

      Below 1 Ω

      B33-1 (NTO) or B75-125 (NTO) - Body ground

      Always

      10 kΩ or higher

      B33-2 (NTB) or B75-126 (NTB) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. REPLACE ECM

    1. Replace the ECM.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

    PERFORM INITIALIZATION

    Click here