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AUTOMATIC TRANSMISSION SYSTEM(for 2TR-FE), Diagnostic DTC:P0720, P0722, P077C, P077D

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DTC Code DTC Name
P0720 Output Speed Sensor Circuit
P0722 Output Speed Sensor Circuit No Signal
P077C Output Speed Sensor Circuit Low
P077D Output Speed Sensor Circuit High
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DESCRIPTION

This sensor detects the rotation speed of the transmission output shaft and sends signals to the ECM. By comparing the input turbine speed signal (NT) with the output shaft speed sensor signal (SP2), the ECM detects the shift timing of the gears and appropriately controls the engine torque and hydraulic pressure according to various conditions. As a result, the gears shift smoothly.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0720 Output Speed Sensor Circuit When the transmission revolution sensor (SP2) input voltage is either higher than 1.9 V or below 0.1 V for 4.5 seconds or more (2 trip detection logic).

  • Open or short in transmission revolution sensor (SP2) circuit

  • Transmission revolution sensor (SP2)

  • ECM

 Comes on DTC stored
P0722 Output Speed Sensor Circuit No Signal

All conditions are met for 5 seconds or more (2 trip detection logic):

(a) Park/neutral position switch D input signal is ON.

(b) Either condition is met.


  • Gear position is 1st:

    Transmission revolution sensor (NT) value is more than 1310 rpm.

  • Gear position is 2nd, 3rd, 4th, 5th or 6th:

    Transmission revolution sensor (NT) value is more than 760 rpm.

(c) The vehicle speed is 9 km/h (5.6 mph) or more.

(d) No signal from transmission revolution sensor (SP2) is input to the ECM.

  • Open or short in transmission revolution sensor (SP2) circuit

  • Transmission revolution sensor (SP2)

  • ECM

 Comes on DTC stored
P077C Output Speed Sensor Circuit Low When the transmission revolution sensor (SP2) input voltage is below 0.1 V for 4.5 seconds or more (2 trip detection logic).

  • Open or short in transmission revolution sensor (SP2) circuit

  • Transmission revolution sensor (SP2)

  • ECM

 Comes on DTC stored
P077D Output Speed Sensor Circuit High When the transmission revolution sensor (SP2) input voltage is higher than 1.9 V for 4.5 seconds or more (2 trip detection logic).

  • Open or short in transmission revolution sensor (SP2) circuit

  • Transmission revolution sensor (SP2)

  • ECM

 Comes on DTC stored
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MONITOR DESCRIPTION

The transmission revolution sensor (SP2) detects the transmission output shaft speed. The ECM calculates gear shifts comparing the transmission revolution sensor (NT) with the transmission revolution sensor (SP2).

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

Table 1. *a Transmission Revolution Sensor (SP2)
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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Tip:

After the repair, clear the DTCs and perform the following procedure to check that DTCs are not output.


  1. Perform the D Position Shift Test in Road Test.*1

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  2. Turn the ignition switch off.

  3. Perform step (*1) again.

  4. Check for DTCs again.

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  1. DATA LIST

    Tip:

    Using the GTS 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 GTS to the DLC3.

    4. Turn the ignition switch to ON.

    5. Turn the GTS on.

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

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


      1. Powertrain > Engine > Data List
        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)

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



      1. Powertrain > Engine > Data List
        Tester Display
        SPD (SP2)




      Tip:

      • SPD (SP2) is always 0 while driving: Open or short in the sensor or circuit.

      • SPD (SP2) value displayed on the GTS is much lower than the actual vehicle speed: Sensor trouble, improper installation, or intermittent connection trouble of the circuit.

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PROCEDURE


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    READ VALUE USING GTS (SPD (SP2) AND SP2 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.

    5. In accordance with the display on the GTS, read the Data List.


      1. Powertrain > Engine > Data List
        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)

        		 0 km/h (0 mph): Vehicle stopped (equal to vehicle speed) -
        SP2 Sensor Voltage Transmission revolution sensor (SP2) output voltage

        Min.: 0.000 V

        Max.: 4.999 V

        		 0.1 to 1.9 V: Engine idling -




      1. Powertrain > Engine > Data List
        Tester Display
        SPD (SP2)
        SP2 Sensor Voltage





      Result
      Result Proceed to
      Data display is not within Normal Condition range A
      Data display is within Normal Condition range B

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    INSPECT TRANSMISSION REVOLUTION SENSOR (SP2)


    1. Remove the transmission revolution sensor (SP2).

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    2. B0024XIC11
      *1 Transmission Revolution Sensor (SP2) *2 Ammeter
      *3 Battery *4 Magnet
      *a 5 mm (0.197 in.) or less - -

      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 (SP2) 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 (SP2O) - 2 (SP2B) Low signal 4 to 8 mA
      1 (SP2O) - 2 (SP2B) High signal 12 to 16 mA
      Result
      Proceed to
      OK
      NG

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    CHECK HARNESS AND CONNECTOR (TRANSMISSION REVOLUTION SENSOR (SP2) - ECM)


    1. Disconnect the C2 transmission revolution sensor (SP2) connector.

    2. Disconnect the C53 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C2-2 (SP2B) - C53-10 (SP2B) Always Below 1 Ω
      C2-1 (SP2O) - C53-9 (SP2O) Always Below 1 Ω
      C2-2 (SP2B) - Body ground Always 10 kΩ or higher
      C2-1 (SP2O) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE ECMClick here

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR