AUTOMATIC TRANSAXLE SYSTEM, Diagnostic DTC:P0793, P07C5, P07C6

DTC Code DTC Name
P0793 Intermediate Shaft Speed Sensor "A" Circuit No Signal
P07C5 Intermediate Shaft Speed Sensor "A" Circuit Low
P07C6 Intermediate Shaft Speed Sensor "A" Circuit High

DESCRIPTION

The output speed sensor NC detects the rotation speed of the counter gear, which indicates the intermediate shaft revolution (speed) of the transaxle. By comparing the input speed sensor NT signal with the output speed sensor NC signal, the ECM detects the shift timing of the gears and appropriately controls the engine torque and hydraulic pressure according to various conditions, thus, providing smooth gear shifts.

B006Y3NC01
*1 Counter Gear *2 C2 Piston
*3 Output Speed Sensor NC *4 Input Speed Sensor NT
DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0793 Intermediate Shaft Speed Sensor "A" Circuit No Signal

All of the following conditions are met (1-trip detection logic):


  • The vehicle is being driven with the shift lever in D.

  • The vehicle speed is 25 km/h (16 mph) or more.

  • The speed indicated by the output speed sensor NC is less than 300 rpm for 2 seconds.

  • Wiring harness connector

  • Transmission revolution sensor (Output speed sensor NC)

  • Transmission wire

  • ECM

 Comes on DTC stored
P07C5 Intermediate Shaft Speed Sensor "A" Circuit Low

All of the following conditions are met (1-trip detection logic):


  • The battery voltage is 8 V or more.

  • The ignition switch is ON.

  • The starter is off.

  • The output speed sensor NC input voltage is less than 0.2 V for 2 seconds.

  • Wiring harness connector

  • Transmission revolution sensor (Output speed sensor NC)

  • Transmission wire

  • ECM

 Comes on DTC stored
P07C6 Intermediate Shaft Speed Sensor "A" Circuit High

All of the following conditions are met (1-trip detection logic):


  • The battery voltage is 8 V or more.

  • The ignition switch is ON.

  • The starter is off.

  • The output speed sensor NC input voltage is more than 1.8 V for 2 seconds.

  • Wiring harness connector

  • Transmission revolution sensor (Output speed sensor NC)

  • Transmission wire

  • ECM

 Comes on DTC stored

MONITOR DESCRIPTION

The NC terminal of the ECM detects a revolution signal from the output speed sensor NC (counter gear RPM). The ECM calculates gear shifts by comparing the input speed sensor NT signal to the output speed sensor NC signal.

If the intermediate (counter) shaft revolution is less than 300 rpm* although the vehicle speed is 25 km/h (16 mph) or more, the ECM interprets this as a malfunction, illuminates the MIL and stores a DTC.

*: Pulse is not output or is irregularly output.

CONFIRMATION DRIVING PATTERN

CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

Tech Tips

After repairs have been completed, clear the DTCs and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.


  1. Connect the GTS to the DLC3.

  2. Turn the ignition switch to ON and turn the GTS on.

  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

  4. Turn the ignition switch off and wait for 2 minutes or more.

  5. Turn the ignition switch to ON and turn the GTS on.

  6. Start the engine.

  7. Perform the D Position Shift Test inspection in Road Test and drive the vehicle for 2 seconds or more at 25 km/h (16 mph) or more.

    Click here

  8. Stop the vehicle.

  9. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

  10. Input the DTC: P0793, P07C5 or P07C6.

  11. Check the DTC judgment result.

    GTS Display Description
    NORMAL

    • DTC judgment completed

    • System normal
    ABNORMAL

    • DTC judgment completed

    • System abnormal
    INCOMPLETE

    • DTC judgment not completed

    • Perform driving pattern after confirming DTC enabling conditions
    N/A

    • Unable to perform DTC judgment

    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    Tech Tips


    • If the judgment result shows NORMAL, the system is normal.

    • If the judgment result shows ABNORMAL, the system has a malfunction.

    • If the judgment result shows INCOMPLETE or N/A, perform the Confirmation Driving Pattern and check the DTC judgment result again.

WIRING DIAGRAM

Refer to DTC P0717.

Click here

CAUTION / NOTICE / HINT

Note

Perform registration and/or initialization when parts related to the automatic transaxle are replaced.

Click here

Tech Tips

Using the 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.


  1. DATA LIST


    1. Warm up the engine.

    2. Turn the ignition switch off.

    3. Connect the GTS to the DLC3.

    4. Turn the ignition switch to ON.

    5. Turn the GTS on.

    6. Enter the following menus: Powertrain / Engine and ECT / Data List.

    7. Read the Data List according to the display on the GTS.


      Powertrain > Engine and ECT > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      SPD (NC) Counter Gear Speed

      Min.: 0 rpm

      Max.: 12750 rpm

      		 - Data is displayed in increments of 50 rpm

      Powertrain > Engine and ECT > Data List
      Tester Display
      SPD (NC)

      Tech Tips


      • SPD (NC) is always 0 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 malfunction, improper installation or intermittent connection malfunction in the circuit.

PROCEDURE


  1. READ VALUE USING GTS (SPD (NC) AND NC SENSOR VOLTAGE)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine and ECT / Data List.

    5. According to the display on the GTS, read the Data List.


      Powertrain > Engine and ECT > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      SPD (NC) Counter gear speed

      Min.: 0 rpm

      Max.: 12750 rpm

      		 - Data is displayed in increments of 50 rpm
      NC Sensor Voltage Counter gear speed sensor output voltage

      Min.: 0 V

      Max.: 4.999 V

      		 0.1 to 1.9 V -

      Powertrain > Engine and ECT > Data List
      Tester Display
      SPD (NC)
      NC Sensor Voltage
      Result
      Result Proceed to
      Data List values are normal A
      Data List values are not normal B

    A

    REPLACE ECM Click here

    B

  2. INSPECT TRANSMISSION REVOLUTION SENSOR (NC)


    1. B006ZSSC02
      *a

      Front view of wire harness connector

      (to Wiring Harness Connector)

      Disconnect the C54 wiring harness connector connector.

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

      Standard Resistance:
      Tester Connection Condition Specified Condition
      C54-3 (NCO) - Body ground Always 99 to 101 Ω

    3. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      C54-4 (NCB) - Body ground Ignition switch ON 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (ECM - WIRING HARNESS CONNECTOR) Click here

    OK

  3. INSPECT WIRING HARNESS CONNECTOR


    1. Remove the wiring harness connector.

      Click here

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

      B00719EC31
      *1 Wiring Harness Connector - -
      *a Transmission wire side *b ECM side
      Standard Resistance
      Tester Connection Condition Specified Condition
      C54-3 (NCO) - A-3 (NCO) Always Below 1 Ω
      C54-4 (NCB) - A-4 (NCB) Always Below 1 Ω
      C54-3 (NCO) or A-3 (NCO) - Other terminals Always 10 kΩ or higher
      C54-4 (NCB) or A-4 (NCB) - Other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE WIRING HARNESS CONNECTOR Click here

    OK

  4. INSPECT TRANSMISSION REVOLUTION SENSOR (SPEED SENSOR INSTALLATION)


    1. Remove the transmission valve body assembly.

      Click here

    2. B006ZAE

      Make sure that the connector is properly connected, and check the transmission revolution sensor installation.

      Click here

      OK
      The installation bolts are tightened properly and there is no clearance between the transmission revolution sensor and transmission valve body assembly.
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE TRANSMISSION REVOLUTION SENSOR Click here

    OK

  5. INSPECT TRANSMISSION WIRE


    1. B00701CC02
      *a

      Component without harness connected

      (Transmission Wire)
      *b Wiring harness connector side
      *c Transmission revolution sensor side

      Disconnect the transmission revolution sensor connector from the transmission wire.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 (NCO) sensor side - A-3 (NCO) wiring harness connector side Always Below 1 Ω
      4 (NCB) sensor side - A-4 (NCB) wiring harness connector side Always Below 1 Ω
      3 (NCO) sensor side or A-3 (NCO) wiring harness connector side - Body ground and other terminals Always 10 kΩ or higher
      4 (NCB) sensor side or A-4 (NCB) wiring harness connector side - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE TRANSMISSION REVOLUTION SENSOR Click here

    NG

    REPLACE TRANSMISSION WIRE Click here

  6. CHECK HARNESS AND CONNECTOR (ECM - WIRING HARNESS CONNECTOR)


    1. Disconnect the C58 ECM connector.

    2. Disconnect the C54 wiring harness connector connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C58-75 (NCB) - C54-4 (NCB) Always Below 1 Ω
      C58-74 (NCO) - C54-3 (NCO) Always Below 1 Ω
      C58-75 (NCB) or C54-4 (NCB) - Body ground and other terminals Always 10 kΩ or higher
      C58-74 (NCO) or C54-3 (NCO) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR