AUTOMATIC TRANSMISSION SYSTEM, Diagnostic DTC:P0722

DTC Code DTC Name
P0722 Output Speed Sensor Circuit No Signal

DESCRIPTION

The transmission revolution 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 transmission revolution sensor (SP2) coil as the parking gear mounted on the rear planetary gear assembly rotates, and this voltage is sent to the ECM. The parking gear on the rear planetary gear is used as the timing rotor for this sensor.

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 No. DTC Detection Condition Trouble Area
P0722

No transmission revolution sensor (SP2) signal to ECM under following conditions: (2-trip detection logic)

(a) Park/neutral position switch (P and N) is OFF

(b) Vehicle speed is 5.59 mph (9 km/h) or more

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

  • Transmission revolution sensor (SP2)

  • ECM

Reference (Using an oscilloscope):

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

A01FIPTE11
Standard
Refer to the illustration.
Terminal SP2+ - SP2-
Tool setting 2 V/DIV., 20 ms./DIV
Vehicle condition Vehicle speed 20 km/h (12 mph)

MONITOR DESCRIPTION

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

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

WIRING DIAGRAM

A01FD9IE04

INSPECTION PROCEDURE


  1. DATA LIST

    Tech Tips

    Using 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 engine switch off.

    3. Connect the GTS to the DLC3.

    4. Turn the engine switch on (IG) position.

    5. Turn the GTS on.

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

    7. According to the display on the GTS, 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 GTS is much lower than the actual vehicle speed:

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

PROCEDURE


  1. INSPECT TRANSMISSION REVOLUTION SENSOR (SP2) INSTALLATION


    1. A01FHSOE43

      Check the transmission revolution sensor (SP2) installation.

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

    NG

    SECURELY INSTALL TRANSMISSION REVOLUTION SENSOR (SP2) OR REPLACE TRANSMISSION REVOLUTION SENSOR (SP2) Click here

    OK

  2. INSPECT TRANSMISSION REVOLUTION SENSOR (SP2)


    1. A01FH1FE09
      Text in Illustration
      *1

      Component without harness connected

      (Transmission Revolution Sensor (SP2))

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

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

      Standard resistance
      Tester Connection

      Specified Condition

      20°C (68°F)
      1 - 2 560 to 680 Ω

    NG

    REPLACE TRANSMISSION REVOLUTION SENSOR (SP2) Click here

    OK

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


    1. A01FFM4E06
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to ECM)

      Connect the transmission revolution sensor (SP2) connector.

    2. Disconnect the ECM connector.

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

      Standard resistance
      Tester Connection

      Specified Condition

      20°C (68°F)
      A21-33 (SP2+) - A21-32 (SP2-) 560 to 680 Ω

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

      Standard resistance (Check for short)
      Tester Connection Specified Condition
      A21-33 (SP2+) - Body ground 10 kΩ or higher
      A21-32 (SP2-) - Body ground ↑

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM Click here