AUTOMATIC TRANSMISSION SYSTEM, Diagnostic DTC:P0722

DTC Code DTC Name
P0722 Output Speed Sensor Circuit No Signal

DESCRIPTION

C161208E09

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 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.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

P0722

Output Speed Sensor Circuit No Signal

All 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 while 4 pulses of the No. 1 vehicle speed sensor signal are sent.

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

(c) Park/neutral position switch is OFF.

  • Open or short in speed sensor SP2 circuit

  • Speed sensor SP2

  • ECM

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

Comes on

DTC stored

Reference: Inspect using an oscilloscope.

Check the waveform of the ECM connector.

Standard

Terminal No. (Symbol)

Tool Setting

Condition

Specified Condition

C30-9 (SP2+) - C30-10 (SP2-)

2 V/DIV., 20 msec./DIV

Vehicle speed 20 km/h (12 mph)

Refer to illustration

MONITOR DESCRIPTION

The output speed sensor SP2 monitors the output shaft speed. The ECM controls the gear shift point and 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 speed sensor SP2 even while the vehicle is moving, it will conclude that there is a malfunction of the output speed sensor SP2. The ECM will illuminate the MIL and store the DTC.

WIRING DIAGRAM

C276971E02

CAUTION / NOTICE / HINT

  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 engine switch off.

    3. Connect the intelligent tester to the DLC3.

    4. Turn the engine switch on (IG).

    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.

      Powertrain > Engine and ECT > 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)

      Vehicle stopped: 0 km/h (0 mph) (output shaft speed 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 intelligent tester is much lower than the actual vehicle speed:

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

PROCEDURE

  1. INSPECT SPEED SENSOR SP2 INSTALLATION

    1. C211922C03

      *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.

    Result

    Proceed to

    OK

    NG
    NG

    SECURELY INSTALL OR REPLACE SPEED SENSOR SP2

    Click here

    OK

  2. INSPECT SPEED SENSOR SP2

    1. C206284C04

      *a

      Component without harness connected

      (Speed Sensor SP2)

      Disconnect the C25 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

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE SPEED SENSOR SP2

    Click here

    OK

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

    1. C214337C05

      *a

      Front view of wire harness connector

      (to ECM)

      Disconnect the C30 ECM connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      C30-9 (SP2+) - C30-10 (SP2-)

      20°C (68°F)

      560 to 680 Ω

      C30-9 (SP2+) - Body ground

      Always

      10 kΩ or higher

      C30-10 (SP2-) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE ECM

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR