AUTOMATIC TRANSMISSION SYSTEM, Diagnostic DTC:P0722

DTC Code DTC Name
P0722 Output Speed Sensor Circuit No Signal

DESCRIPTION

Speed sensor SP2 detects the rotation speed of the transmission output shaft and sends signals to the ECM. The ECM determines the vehicle speed based on these signals. An AC voltage is generated in the speed sensor SP2 coil as the parking gear mounted on the rear planetary gear assembly rotates, and this voltage is sent to the ECM.

The gear shift point and lock-up timing are controlled by the ECM based on the signals from this vehicle speed sensor and the throttle position sensor signal.

DTC Code DTC Detection Condition Trouble Area
P0722

Both conditions are met for 5 seconds or more continuously (2-trip detection logic):

(a) No signal from speed sensor SP2 is input to the ECM.

(b) The vehicle speed is 9 km/h (5.59 mph) or more.

  • Open or short in speed sensor SP2 circuit

  • Speed sensor SP2

  • ECM

  • Automatic transmission (clutch, brake, gear, etc.)

Reference: Inspect using an oscilloscope.

Check the waveform of the ECM connector.

Standard
Terminal No. (Symbol) Tool Setting Condition Specified Condition
D3-35 (SP2+) - D3-27 (SP2-) 2 V/DIV., 20 msec./DIV. Vehicle speed 20 km/h (12 mph) Refer to illustration
A01BDFYE01

MONITOR DESCRIPTION

Speed sensor SP2 monitors the output shaft speed. The ECM controls the gear shift point and lock-up timing based on the signals from speed sensor SP2 and the throttle position sensor.

If the ECM detects no signal from speed sensor SP2 even while the vehicle is moving, it will conclude that there is a malfunction of speed sensor SP2. The ECM will illuminate the MIL and store the DTC.

WIRING DIAGRAM

A01BCS8E02

INSPECTION PROCEDURE


  1. DATA LIST

    Tech Tips

    Using the intelligent tester to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may be discovered before parts or wiring is disturbed. Reading the Data List information early in troubleshooting is one way to save diagnostic time.

    Note

    In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not.


    1. Warm up the engine.

    2. Turn the ignition switch off.

    3. Connect the intelligent tester to the DLC3.

    4. Turn the ignition switch to ON.

    5. Turn the intelligent tester on.

    6. Enter the following menus: Powertrain / Engine and ECT / Data List.

    7. According to the display on the tester, read the Data List.

      Engine and ECT
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      SPD (SP2)

      Output shaft speed/

      Min.: 0 km/h (0 mph)

      Max.: 255 km/h (158 mph)

      		 Vehicle stopped: 0 km/h (0 mph) (output shaft speed equal to vehicle speed) -

      Tech Tips


      • SPD (SP2) is always 0 while driving:

        Open or short in the sensor or circuit.

      • The SPD (SP2) value displayed on the intelligent tester is much less than the actual vehicle speed:

        Sensor trouble, improper installation, or intermittent connection trouble in the circuit.

PROCEDURE


  1. INSPECT SPEED SENSOR SP2 INSTALLATION


    1. A01BGTZE01
      Text in Illustration
      *a CORRECT
      *b INCORRECT

      Check the speed sensor SP2 installation.

      OK
      The installation bolt is tightened properly and there is no clearance between the sensor and transmission case.

    NG

    SECURELY INSTALL OR REPLACE SPEED SENSOR SP2

    OK

  2. INSPECT SPEED SENSOR SP2


    1. A01BDLXE04
      Text in Illustration
      *a

      Component without harness connected

      (Speed Sensor SP2)

      Disconnect the speed sensor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 - 2 20°C (68°F) 560 to 680 Ω

    NG

    REPLACE SPEED SENSOR SP2

    OK

  3. CHECK HARNESS AND CONNECTOR (SPEED SENSOR SP2 - ECM)


    1. A01BFHCE33
      Text in Illustration
      *a

      Rear 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
      D3-35 (SP2+) - D3-27 (SP2-) 20°C (68°F) 560 to 680 Ω
      D3-35 (SP2+) - Body ground Always 10 kΩ or higher
      D3-27 (SP2-) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM