CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM, Diagnostic DTC:P0720, P0722

DTC Code DTC Name
P0720 Output Speed Sensor Circuit
P0722 Output Speed Sensor Circuit No Signal

DESCRIPTION

The ECM receives a signal from the secondary pulley speed sensor (transmission revolution sensor (NOUT)) installed in the continuously variable transaxle and determines the output shaft speed in order to control the gear ratio.

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

DTC Code

DTC Detection Condition


  1. Diagnosis Condition

  2. Malfunction Status

  3. Malfunction Time

  4. Other

 Trouble Area
P0720

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

  2. The transmission revolution sensor (NOUT) 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 (NOUT) circuit

  • Transmission revolution sensor (NOUT)

  • ECM
P0722

  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 (NOUT) is less than 300 rpm.

  3. 2 seconds

  4. 1 trip detection logic

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

  • Transmission revolution sensor (NOUT)

  • ECM

MONITOR DESCRIPTION

The ECM receives a signal from the secondary pulley speed sensor (transmission revolution sensor (NOUT)) installed in the continuously variable transaxle and determines the output shaft speed in order to control the gear ratio.

If the ECM detects no signal from the secondary pulley speed sensor even while the vehicle is moving, it will conclude that there is a malfunction in the secondary pulley speed sensor. The ECM will illuminate the MIL and store the DTC.

WIRING DIAGRAM

A005TZ2E02

INSPECTION PROCEDURE

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (SPD (NOUT) AND NOUT SENSOR VOLTAGE)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the intelligent tester on.

    4. Enter the following menus: Powertrain / Engine and ECT / Data List.

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

      Engine and ECT
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      SPD (NOUT)

      Secondary pulley speed (NOUT)/

      min.: 0 rpm

      max.: 12750 rpm

      • Vehicle stopped: 0 rpm

      • Vehicle cruising at approx. 60 km/h (37 mph): 2800 rpm

      		 Data is displayed in increments of 50 rpm.
      NOUT Sensor Voltage

      Secondary pulley speed (NOUT) sensor output voltage/

      min.: 0 V

      max.: 5 V

      		 Engine idling: Approx. 2 V -
      Result
      Result Proceed to
      Data displayed is not as specified under Normal Condition A
      Data displayed is as specified under Normal Condition B

    B

    Click here

    A

  2. INSPECT TRANSMISSION REVOLUTION SENSOR (NOUT)


    1. A005T8AE02
      Text in Illustration
      *1

      Component without harness connected

      (Transmission Revolution Sensor (NOUT))
      *2 Ammeter
      *3 Battery
      *4 5 mm (0.197 in.) Gap or Closer

      Remove the transmission revolution sensor (NOUT) Click here.

    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 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. 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 (NOTO) - 2 (NOTB) Low signal 4 to 8 mA
      1 (NOTO) - 2 (NOTB) High signal 12 to 16 mA

    NG

    REPLACE TRANSMISSION REVOLUTION SENSOR (NOUT) Click here

    OK

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


    1. A005USNE02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Transmission Revolution Sensor (NOUT))
      *2

      Front view of wire harness connector

      (to ECM)

      Disconnect the transmission revolution sensor (NOUT) connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B34-1 (NOTO) - B39-125 (NOTO) Always Below 1 Ω
      B34-2 (NOTB) - B39-101 (NOTB) Always Below 1 Ω
      B34-1 (NOTO) or B39-125 (NOTO) - Body ground Always 10 kΩ or higher
      B34-2 (NOTB) or B39-101 (NOTB) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

  5. PERFORM INITIALIZATION

    Note


    • Performing reset memory will clear the learned values of both the yaw rate sensor (deceleration sensor 0 point calibration) and CVT oil pressure (CVT oil pressure calibration). Make sure to perform reset memory, yaw rate sensor 0 point calibration and CVT oil pressure calibration when replacing any of the parts shown in the following table:

      Replaced Part

      • Continuously variable transaxle assembly

      • ECM

      • Oil pressure sensor

      • Yaw rate sensor

    • After performing reset memory, always perform yaw rate sensor (deceleration sensor 0 point) calibration first, and then CVT oil pressure calibration.

    • Always perform 0 point calibration with the vehicle on level ground.

    • Do not shake or vibrate the vehicle during 0 point calibration.


    1. Using the intelligent tester, perform reset memory, deceleration sensor 0 point calibration and CVT oil pressure calibration Click here.

    2. Check that no DTC is stored.


    NEXT

    END

  6. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

  7. PERFORM INITIALIZATION

    Note


    • Performing reset memory will clear the learned values of both the yaw rate sensor (deceleration sensor 0 point calibration) and CVT oil pressure (CVT oil pressure calibration). Make sure to perform reset memory, yaw rate sensor 0 point calibration and CVT oil pressure calibration when replacing any of the parts shown in the following table:

      Replaced Part

      • Continuously variable transaxle assembly

      • ECM

      • Oil pressure sensor

      • Yaw rate sensor

    • After performing reset memory, always perform yaw rate sensor (deceleration sensor 0 point) calibration first, and then CVT oil pressure calibration.

    • Always perform 0 point calibration with the vehicle on level ground.

    • Do not shake or vibrate the vehicle during 0 point calibration.


    1. Using the intelligent tester, perform reset memory, deceleration sensor 0 point calibration and CVT oil pressure calibration Click here.

    2. Check that no DTC is stored.


    NEXT

    END