CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM, Diagnostic DTC:P0722,P077C and P077D

DTC Code DTC Name
P0722 Output Speed Sensor Circuit No Signal
P077C Output Speed Sensor Circuit Low
P077D Output Speed Sensor Circuit High

DESCRIPTION

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

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

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

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 malfunctions are 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

  • Harness or connector

  • Transmission revolution sensor (NOUT)

  • ECM

Comes on

DTC stored

P077C

Output Speed Sensor Circuit Low

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

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

  2. The transmission revolution sensor (NOUT) output voltage is below 0.1 V.

  3. 2 seconds

  4. 1-trip detection logic

  • Harness or connector

  • Transmission revolution sensor (NOUT)

  • ECM

Comes on

DTC stored

P077D

Output Speed Sensor Circuit High

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

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

  2. The transmission revolution sensor (NOUT) output voltage is higher than 1.9 V.

  3. 2 seconds

  4. 1-trip detection logic

  • Harness or connector

  • Transmission revolution sensor (NOUT)

  • ECM

Comes on

DTC stored

MONITOR DESCRIPTION

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

If the ECM detects no signal from the transmission revolution sensor (NOUT) even while the vehicle is moving, it will determine that the transmission revolution sensor (NOUT) is malfunctioning. The ECM will illuminate the MIL and store a DTC.

WIRING DIAGRAM

C298189E09

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 / Primary.

    5. In accordance with 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 2600 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

      0.1 to 1.9 V: Engine idling (Vehicle stopped with shift lever in P or N)

      -

      Powertrain > Engine and ECT > Data List

      Tester Display

      SPD (NOUT)

      NOUT Sensor Voltage

    Result

    Result

    Proceed to

    Data display is not within Normal Condition range

    A

    Data display is within Normal Condition range

    B
    B

    REPLACE ECMClick here

    A

  2. INSPECT TRANSMISSION REVOLUTION SENSOR (NOUT)

    1. Remove the transmission revolution sensor (NOUT).

      Click here

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

      C297974C02

      *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 B31 transmission revolution sensor (NOUT) connector.

    2. Disconnect the B93 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) - B93-127 (NOTO)

      Always

      Below 1 Ω

      B31-2 (NOTB) - B93-128 (NOTB)

      Always

      Below 1 Ω

      B31-1 (NOTO) or B93-127 (NOTO) - Body ground and other terminals

      Always

      10 kΩ or higher

      B31-2 (NOTB) or B93-128 (NOTB) - Body ground and other terminals

      Always

      10 kΩ or higher

    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.

    Result

    Proceed to

    NEXT
    NEXT

    PERFORM INITIALIZATION

    Click here

  5. REPLACE ECM

    1. Replace the ECM.

    Result

    Proceed to

    NEXT
    NEXT

    PERFORM INITIALIZATION

    Click here