DTC    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 signal to the ECM. The ECM determines the vehicle speed based on these signals. 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 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.

G036793E01


DTC No.
DTC Detection Condition
Trouble Area
P0722
  1. All conditions below are detected 500 times or more continuously
    (1 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. PNP switch is OFF
    4. Transfer position is not neutral (4WD)
  1. Open or short in speed sensor (SP2) circuit
  2. Output speed sensor (SP2)
  3. ECM
  4. Automatic transmission (clutch, brake or gear, etc.)

MONITOR DESCRIPTION

The output speed sensor SP2 monitors the output shaft speed. The ECM controls the gear shift 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, the ECM will conclude that the output shaft speed sensor SP2 is malfunctioning. The ECM will illuminate the MIL and set the DTC.

WIRING DIAGRAM


A110970E02


INSPECTION PROCEDURE

HINT:
Using the intelligent tester's Data List allows switch, sensor, actuator and other item values to be read without removing any parts. Reading the Data List early in troubleshooting is one way to save time.

  1. Warm up the engine.
  2. Turn the ignition switch OFF.
  3. Connect the intelligent tester to the DLC3.
  4. Turn the ignition switch ON and push the tester main switch ON.
  5. Enter the following menus: Powertrain / Engine and ECT / Data List.
  6. Follow the instructions on the tester and read the Data List.

Item
Measurement Item/
Range (Display)
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 is equal to vehicle speed)
-

CAUTION:
In the table above, 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.

HINT:
  1. SPD (SP2) is always 0 while driving:
    Open or short in the sensor or circuit.
  2. 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.

1.INSPECT SPEED SENSOR INSTALLATION


    BR03795E15

  1. Check the speed sensor (SP2) installation.

    OK:
    Installation bolt is tightened properly and there is no clearance between the sensor and transmission case.



NG
SECURELY INSTALL SENSOR OR REPLACE SENSOR
OK


2.INSPECT OUTPUT SPEED SENSOR (SP2)


    C058536E06

  1. Disconnect the T7 sensor connector from the transmission.



  1. Measure the resistance of the sensor.

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


    HINT:
    A110975E01
    Reference: Inspect using an oscilloscope.
    Check the waveform of the ECM connector.

    Standard voltage:
    Refer to illustration.:
    Item
    		Content
    Tester Connection
    		E16-34 (SP2+) - E16-26 (SP2-)
    Tool Setting
    		2 V/DIV, 2 msec./DIV
    Condition
    		Vehicle speed 20 km/h (12 mph)



NG
REPLACE OUTPUT SPEED SENSOR (SP2)
OK


3.CHECK WIRE HARNESS (OUTPUT SPEED SENSOR - ECM)


    G035616E02

  1. Disconnect the E16 ECM connector.

  1. Measure the resistance of the wire harness side connector.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E16-34 (SP2+) - E16-26 (SP2-)
    		20°C (68°F)
    		560 to 680 Ω
    E16-34 (SP2+) - Body ground
    		20°C (68°F)
    		10 kΩ or higher
    E16-26 (SP2-) - Body ground
    		20°C (68°F)
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

REPLACE ECM