CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM, Diagnostic DTC:P0720 and 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.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

P0720

Output Speed Sensor Circuit

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

  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

Comes on

DTC stored

P0722

Output Speed Sensor 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 (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

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 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

C277072E02

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 (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.

      Powertrain > Engine and ECT > Data List

      Tester Display

      SPD (NOUT)

      NOUT Sensor Voltage

      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

      • Vehicle stopped: 0 rpm

      • Vehicle cruising at approx. 60 km/h (37 mph): 2850 rpm

      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

      Engine idling: Approx. 2 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 (NOUT)

    1. Remove the transmission revolution sensor (NOUT).

      Click here

      C277851C03

      *1

      Transmission Revolution Sensor (NOUT)

      *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 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

    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 B31 transmission revolution sensor (NOUT) 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

      B31-1 (NOTO) - B75-129 (NOTO)

      Always

      Below 1 Ω

      B31-2 (NOTB) - B75-130 (NOTB)

      Always

      Below 1 Ω

      B31-1 (NOTO) or B75-129 (NOTO) - Body ground

      Always

      10 kΩ or higher

      B31-2 (NOTB) or B75-130 (NOTB) - 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