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СИСТЕМА АВТОМАТИЧЕСКОЙ ТРАНСМИССИИ С ЭЛЕКТРОННЫМ УПРАВЛЕНИЕМ, Diagnostic DTC:P0722

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DTC Code DTC Name
P0722 Output Speed Sensor Circuit No Signal
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DESCRIPTION

The 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 rotor mounted on the output shaft 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 speed sensor and throttle position sensor.

DTC No. DTC Detection Condition Trouble Area
P0722

  • All conditions below are detected 500 times or more continuously (2-trip detection logic)


    1. No signal from speed sensor (SP2) is input to ECM while 4 pulses of No.1 vehicle speed sensor signal are sent

    2. Vehicle speed is 9 km/h (6 mph) or more for at least 4 sec.

    3. Park/neutral position switch is OFF.

  • Open or short in speed sensor (SP2) circuit

  • Speed sensor (SP2)

  • ECM

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

Reference (Using an oscilloscope):

Check the waveform between terminals SP2+ and SP2- of the ECM connector.

Standard
Refer to the illustration.
Tip:

Gauge setting.

Terminal SP2+ - SP2-
Tool setting 2 V/DIV., 20 ms/DIV.
Vehicle condition Vehicle speed 20 km/h (12 mph)
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MONITOR DESCRIPTION

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

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

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WIRING DIAGRAM

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INSPECTION PROCEDURE


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  1. DATA LIST

    Tip:

    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 the ON position.

    5. Turn on the tester.

    6. Select the item "Enter / Powertrain / Engine and ECT / Data List".

    7. Follow the instructions on the tester and read the Data List.

      Item

      Measurement Item/

      Range (display)

      		 Normal Condition
      SPD (SP2)

      Output shaft Speed/

      min.: 0 km/h (0 mph)

      max.: 255 km/h (158 mph)

      Vehicle stopped: 0 km/h (0 mph)

      Tip:

      Equal to vehicle speed
      Tip:

      • SPD (SP2) is always 0 while driving:

        Open or short in the sensor or circuit.

      • The SPD (SP2) value displayed on the tester 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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    INSPECT SPEED SENSOR INSTALLATION


    1. A01BD14E34

      Check the speed sensor (SP2) installation.

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

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    INSPECT SPEED SENSOR (SP2)


    1. A01BDLXE13

      Disconnect the speed sensor (SP2) connector from the transmission.

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

      Resistance
      Tester Connection

      Specified Condition

      20°C (68°F)
      1 - 2 560 to 680 Ω
      Table 1. Text in Illustration
      *a

      Component without harness connected

      (Speed Sensor (SP2))

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    CHECK HARNESS AND CONNECTOR (SPEED SENSOR -ECM)


    1. A01BB6YE11

      Connect the speed sensor connector.

    2. Disconnect the ECM connector.

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

      Resistance
      Tester Connection

      Specified Condition

      20°C (68°F)
      D97-125 (SP2+) - D97-101 (SP2-) 560 to 680 Ω

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

      Resistance (Check for short)
      Tester Connection Specified Condition
      D97-125 (SP2+) - Body ground 10 kΩ or higher
      D97-101 (SP2-) - Body ground ↑
      Table 2. Text in Illustration
      *a

      Front view of wire harness connector

      (to ECM)

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    REPLACE ECM

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    REPLACE SPEED SENSOR (SP2)

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    REPAIR OR REPLACE HARNESS OR CONNECTOR