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 Code

DTC Detection Condition

  1. Diagnosis Condition

  2. Malfunction Status

  3. Malfunction Time

  4. Other

Trouble Area

P0722

  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 assembly.

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

  3. 2 seconds

  4. 1-trip detection logic

  • Wire harness or connector

  • Transmission revolution sensor (NOUT)

  • ECM

P077C

  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

  • Wire harness or connector

  • Transmission revolution sensor (NOUT)

  • ECM

P077D

  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

  • Wire harness or connector

  • Transmission revolution sensor (NOUT)

  • ECM

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 the DTC.

WIRING DIAGRAM

C264273E53

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.

      Table 1. Engine and ECT

      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 2500 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)

      -
      Table 2. Result

      Result

      Proceed to

      Data display is not within Normal Condition range

      A

      Data display is within Normal Condition range

      B

    REPLACE ECMClick here

  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.

      C154686E18
      Table 3. Text in Illustration

      *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

    REPLACE TRANSMISSION REVOLUTION SENSOR (NOUT)

    (Click here)

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

    1. Disconnect the C110 transmission revolution sensor (NOUT) connector.

    2. Disconnect the C111 ECM connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      C110-1 (NOTO) - C111-127 (NOTO)

      Always

      Below 1 Ω

      C110-2 (NOTB) - C111-128 (NOTB)

      Always

      Below 1 Ω

      C110-1 (NOTO) or C111-127 (NOTO) - Body ground and other terminals

      Always

      10 kΩ or higher

      C110-2 (NOTB) or C111-128 (NOTB) - Body ground and other terminals

      Always

      10 kΩ or higher

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

  4. REPLACE ECM

    1. Replace the ECM (Click here).

    PERFORM INITIALIZATION

    (Click here)

  5. REPLACE ECM

    1. Replace the ECM (Click here).

    PERFORM INITIALIZATION

    (Click here)