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 No.

DTC Detection Condition


  1. Diagnosis Condition

  2. Malfunction Status

  3. Malfunction Time

  4. Other

Trouble Area
P0720
  1. Transmission revolution (NOUT) signal malfunction is not detected

  2. Transmission revolution sensor (NOUT) input voltage is less than 0.1 V, or more than 1.9 V

  3. 2 seconds

  4. 1-trip detection logic


  • Open or short transmission revolution sensor (NOUT) circuit

  • Transmission revolution sensor (NOUT)

  • ECM

P0722
  1. Driving with the shift lever in D, output shaft speed of 300 rpm or more, and no error detected from the park/ neutral switch

  2. Transmission revolution sensor (NOUT) Speed: Less than 300 rpm

  3. 2 seconds

  4. 1-trip detection logic


  • Open or short 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 set the DTC.

WIRING DIAGRAM

A01182SE02

INSPECTION PROCEDURE

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (SPD NOUT)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the 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.

      Tester Display

      Measurement Item/

      Range (display)

      Normal Condition Diagnostic Note
      SPD (NOUT)

      Secondary pulley speed (NOUT)/

      display: 50 rpm

      min.: 0 rpm

      max.: 12750 rpm


      • Vehicle stopped: 0 rpm

      • Vehicle cruising at approx. 60 km/h (37 mph): 2900 rpm

      -
      Result
      Result Proceed to
      Data display is not within Normal Condition range A
      Data display is within Normal Condition range B

    B
    A
  2. INSPECT TRANSMISSION REVOLUTION SENSOR (NOUT)


    1. Remove the transmission revolution sensor (NOUT) Click here and then connect the battery.

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

      A0117JOE05

      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.

    3. 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
      High signal 12 to 16 mA

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


    1. A0118BNE02
      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 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B18-1 (NOTO) - B8-102 (NOTO) Always Below 1 Ω
      B18-2 (NOTB) - B8-101 (NOTB) Always Below 1 Ω
      B8-101 (NOTB) - Body ground Always 10 kΩ or higher
      B8-102 (NOTO) - Body ground Always 10 kΩ or higher

    NG
    OK
  4. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT
  5. PERFORM INITIALIZATION

    Note


    • Performing reset memory/initialization will clear the learned values of both the yaw rate and acceleration sensor (deceleration sensor 0 point calibration) and the CVT oil pressure (CVT oil pressure calibration). Make sure to perform reset memory, yaw rate and acceleration 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 and acceleration sensor

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

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

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


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

    2. Check for DTCs again Click here.


    NEXT