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 a signal to the ECM.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0720 Output Speed Sensor Circuit

  1. Diagnosis Condition


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

  2. Malfunction Status


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

  3. Malfunction Time


    • 2 seconds

  4. Other


    • 1-trip detection logic

  • Wire harness or connector

  • Transmission revolution sensor (NOUT)

  • ECM

 Comes on DTC stored
P0722 Output Speed Sensor Circuit No Signal

  1. Diagnosis Condition


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

  2. Malfunction Status


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

  3. Malfunction Time


    • 2 seconds

  4. Other


    • 1-trip detection logic

  • Wire harness or connector

  • Transmission revolution sensor (NOUT)

  • ECM

 Comes on DTC stored

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 (transmission revolution sensor (NOUT)) even while the vehicle is moving, it will determine that there is a malfunction in the secondary pulley speed sensor (transmission revolution sensor (NOUT)). The ECM will illuminate the MIL and store a DTC.

WIRING DIAGRAM

A01TCRXE51
*a Transmission Revolution Sensor (NOUT)

PROCEDURE


  1. READ VALUE USING GTS (SPD (NOUT) AND NOUT 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 / Primary.

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


      Powertrain > Engine and ECT > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      SPD (NOUT) Secondary pulley speed (NOUT)

      min.: 0 rpm

      max.: 12750 rpm

      • 0 rpm: Vehicle stopped

      • Approximately 3000 rpm: Vehicle cruising at approximately 60 km/h (37 mph)

      		 Data is displayed in increments of 50 rpm.
      NOUT Sensor Voltage Secondary pulley speed (NOUT) sensor output voltage

      min.: 0.000 V

      max.: 4.999 V

      		 0.6 to 1.5 V: Engine idling (Vehicle stopped with shift lever in P or N) -
      Result
      Result Proceed to
      Data List value is not normal A
      Data List value is normal B

    B

    REPLACE ECM Click here

    A

  2. INSPECT TRANSMISSION REVOLUTION SENSOR (NOUT)


    1. Remove the transmission revolution sensor (NOUT).

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

      A01TCL0C38
      *1 Battery *2 Ammeter
      *a

      Component without harness connected

      (Transmission Revolution Sensor (NOUT))

      		 *b Magnet
      *c 5 mm or less - -

    3. Wave a magnetic object left and right in front of the transmission revolution sensor (NOUT) tip (5 mm (0.197 in.) or less) 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 (NOTO) - 2 (NOTB) Low signal 4 to 8 mA
      1 (NOTO) - 2 (NOTB) High signal 12 to 16 mA
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE TRANSMISSION REVOLUTION SENSOR (NOUT) Click here

    OK

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


    1. Disconnect the B112 transmission revolution sensor (NOUT) connector.

    2. Disconnect the B186 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B112-1 (NOTO) - B186-127 (NOTO) Always Below 1 Ω
      B112-2 (NOTB) - B186-128 (NOTB) Always Below 1 Ω
      B112-1 (NOTO) or B186-127 (NOTO) - Body ground and other terminals Always 10 kΩ or higher
      B112-2 (NOTB) or B186-128 (NOTB) - Body ground and other terminals Always 10 kΩ or higher

    4. Connect the B186 ECM connector.

    5. Connect the B112 transmission revolution sensor (NOUT) connector.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (TRANSMISSION REVOLUTION SENSOR (NOUT) - ECM)

    OK

  4. REPLACE ECM


    1. Replace the ECM.

      for 1ZR-FE: Click here

      for 2ZR-FE: Click here

      Result
      Proceed to
      NEXT

    NEXT

    PERFORM INITIALIZATION Click here

  5. REPLACE ECM


    1. Replace the ECM.

      for 1ZR-FE: Click here

      for 2ZR-FE: Click here

      Result
      Proceed to
      NEXT

    NEXT

    PERFORM INITIALIZATION Click here