AUTOMATIC TRANSAXLE SYSTEM (for 3ZR-FE), Diagnostic DTC:P0793

DTC Code DTC Name
P0793 Intermediate Shaft Speed Sensor "A"

DESCRIPTION

This sensor detects the rotation speed of the counter gear. By comparing the counter gear speed signal (NC) with the direct clutch speed sensor signal (NT), the ECM detects the shift timing of the gears and approximately controls the engine torque and hydraulic pressure according to various conditions. Thus smooth gear shifting is performed.

DTC Code DTC Detection Condition Trouble Area
P0793

The ECM detects conditions (a) and (b) continuously for 2 seconds or more (1 trip detection logic):

(a) Park/neutral position switch: NSW is OFF.

(b) Speed sensor NC: Less than 300 rpm.

  • Open or short in speed sensor NC circuit

  • Speed sensor NC

  • ECM

MONITOR DESCRIPTION

The NC terminal of the ECM detects revolution signals from speed sensor NC (counter gear rpm). The ECM calculates gear shifts by comparing the signal from speed sensor NT with the signal from speed sensor NC.

While the vehicle is operating in 2nd, 3rd or 4th gear with the shift lever in D, if the counter gear revolution is less than 300 rpm*1 and the output shaft revolution is more than 1000 rpm*2, the ECM detects the trouble, illuminates the MIL and stores the DTC.

*1: A pulse is not output or is irregularly output.

*2: The vehicle speed is 50 km/h (31 mph) or more.

WIRING DIAGRAM

A005UVFE54

INSPECTION PROCEDURE


  1. DATA LIST

    Tech Tips

    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 ON.

    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.

      Engine and ECT
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      SPD (NC)

      Counter gear speed/

      Min.: 0 rpm

      Max.: 12750 rpm

      In 4th gear with shift lever in D (after warming up the engine):

      Intermediate shaft speed (NC) becomes close to engine speed

      		 Data is displayed in increments of 50 rpm.

      Tech Tips


      • SPD (NC) is always 0 rpm while driving:

        Open or short in the sensor or circuit.

      • SPD (NC) is always more than 0 and less than 300 rpm while driving the vehicle at 50 km/h (31 mph) or more:

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

PROCEDURE


  1. INSPECT SPEED SENSOR NC (INSTALLATION)


    1. A005UCJE01

      Check the speed sensor NC installation.

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

    NG

    SECURELY INSTALL OR REPLACE SPEED SENSOR NC

    OK

  2. INSPECT SPEED SENSOR NC


    1. A005WJ4E01
      Text in Illustration
      *1

      Component without harness connected

      (Speed Sensor NC)

      Disconnect the B41 speed sensor NC 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

    NG

    REPLACE SPEED SENSOR NC Click here

    OK

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


    1. A005S8YE07
      Text in Illustration
      *1

      Front view of wire harness connector

      (to ECM)

      Disconnect the B39 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B39-122 (NC+) - B39-100 (NC-) 20°C (68°F) 560 to 680 Ω
      B39-122 (NC+) - Body ground Always 10 kΩ or higher
      B39-100 (NC-) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM Click here