MULTI-MODE MANUAL TRANSAXLE SYSTEM, Diagnostic DTC:P0920

DTC Code DTC Name
P0920 Gear Shift Forward Actuator Circuit

DESCRIPTION

The shift and select actuator is operated by the transmission control ECU and changes the transaxle gear by the shift and select lever shaft movement. An electric motor (shift motor) moves the shift and select lever shaft in the shift direction, and the shift stroke sensor, which is mounted on the shift and select actuator assembly, detects the shift position. The transmission control ECU monitors the electrical current and shift motor output terminal voltage, and detects malfunctions in the shift motor circuit.

A0138BCE01
Text in Illustration
*a Shift and Select Actuator Operation
*b Shift Direction
*c Select Direction
DTC No. DTC Detection Condition Trouble Area
P0920

The transmission control ECU detects the following conditions:

(1-trip detection logic)


  1. Shift motor is not energized.

  2. Voltages of shift motor terminal (MSF+ or MSF-) is less than 0.5 V*1, or more than threshold*2 for 0.5 seconds.

  3. +BM voltage is 10 V or more.

  • Shift and select actuator assembly (shift motor)

  • Wire harness or connector

  • Transmission control ECU

The transmission control ECU detects the following conditions:

(1-trip detection logic)


  1. Shift motor is energized.

  2. Target shift motor current is more than 5A.

  3. Actual shift motor current is less than 1A*3.

The transmission control ECU detects the following conditions:

(1-trip detection logic)


  1. Shift motor is not energized.

  2. Difference between maximum and minimum voltages of shift motor terminal (MSF+ or MSF-) is more than threshold*4 for 0.5 seconds.

  3. +BM voltage is 10 V or more.

WIRING DIAGRAM

A0136OOE01

INSPECTION PROCEDURE

Note

In shift stroke sensor or shift and select actuator assembly replacement, perform the [Initialization and Learning] procedure Click here and [Synchronization Position Calibration] procedure Click here after installing the sensor or actuator assembly. If the sensor or actuator is installed without performing [Initialization and Learning] and [Synchronization Position Calibration], it may cause driving performance degradation or system component breakage.

PROCEDURE


  1. INSPECT TRANSMISSION CONTROL ECU (MSF TERMINAL VOLTAGE)


    1. Turn the ignition switch to ON.

    2. A0137QSE15
      Text in Illustration
      *a

      Component with harness connected

      (Transmission Control ECU)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A49-4 (MSF+) - Body ground Ignition switch ON 4.0 to 7.0 V
      A49-3 (MSF-) - Body ground Ignition switch ON 4.0 to 7.0 V

    3. Turn the ignition switch off.


    NG

    Click here

    OK

    CHECK INTERMITTENT PROBLEMS Click here

  2. CHECK TERMINAL CONDITION (TRANSMISSION CONTROL ECU)


    1. Disconnect the A49 transmission control ECU connector.

    2. Check the connections of the transmission control ECU connector.

      OK
      The transmission control ECU and wire harness connectors and connector terminals are connected securely and are not bent, rusted, or damaged.

    NG

    CONNECT CORRECTLY

    OK

  3. CHECK SHIFT MOTOR CIRCUIT


    1. A0137TQE12
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Transmission Control ECU)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A49-4 (MSF+) - A28-3 (MSF-) Always 0.1 to 100 Ω
      A49-4 (MSF+) - Body ground Always 10 kΩ or higher
      A49-3 (MSF-) - Body ground Always 10 kΩ or higher

    NG

    Click here

    OK

  4. REPLACE TRANSMISSION CONTROL ECU


    1. Replace the transmission control ECU Click here.


    NEXT

  5. PERFORM INITIALIZATION


    1. Perform the initialization and learning for multi-mode manual transaxle system Click here.


    NEXT

    END

  6. CHECK TERMINAL CONDITION (SHIFT MOTOR)


    1. Disconnect the B30 shift motor connector.

    2. Check the connections of the shift motor connector.

      OK
      The shift motor and wire harness connectors and connector terminals are connected securely and are not bent, rusted, or damaged.

    NG

    CONNECT CORRECTLY

    OK

  7. CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL ECU - SHIFT MOTOR)


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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A49-4 (MSF+) - B30-2 Always Below 1 Ω
      A49-3 (MSF-) - B30-1 Always Below 1 Ω
      A49-4 (MSF+) or B30-2 - Body ground Always 10 kΩ or higher
      A49-3 (MSF-) or B30-1 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. INSPECT SHIFT AND SELECT ACTUATOR ASSEMBLY (SHIFT MOTOR)


    1. Disconnect the B30 shift motor connector.

    2. A01389RE02
      Text in Illustration
      *a

      Component without harness connected

      (Shift and Select Actuator Assembly (Shift Motor))

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 - 2 Always 0.1 to 100 Ω
      1 - Body ground Always 10 kΩ or higher
      2 - Body ground Always 10 kΩ or higher

    NG

    Click here

    OK

    CHECK INTERMITTENT PROBLEMS Click here

  9. REPLACE SHIFT AND SELECT ACTUATOR ASSEMBLY


    1. Replace the shift and select actuator assembly Click here.


    NEXT

  10. PERFORM INITIALIZATION


    1. Perform the initialization and learning for multi-mode manual transaxle system Click here.


    NEXT

    END