MULTI-MODE MANUAL TRANSAXLE SYSTEM, Diagnostic DTC:P0812

DTC Code DTC Name
P0812 Reverse Input Circuit

DESCRIPTION

As one judgment method, transmission control ECU uses the back up light switch signal indicating whether the gear is in reverse or not. Receiving the signals from the back up light switch assembly and the shift and select stroke sensor, the transmission control ECU detects that the transmission gear is in reverse. If the signal from the back up light switch assembly does not match with the signal from the shift and select stroke sensor, the transmission control ECU sets the DTC.

DTC No. DTC Detection Conditions Trouble Areas
P0812

The transmission control ECU detects the following conditions simultaneously:

(1 trip detection logic)


  1. Shift and select stroke sensor send R position signal (information signal) to the transmission control ECU

  2. Back up light switch is OFF for 0.5 seconds

  • Shift stroke sensor

  • Select stroke sensor

  • Back up light switch assembly

  • Open or short in back up light switch circuit

  • Transmission control ECU
P0812

The transmission control ECU detects the following conditions simultaneously:

(1 trip detection logic)


  1. Shift and select stroke sensor does not send R position signal (information signal) to the transmission control ECU

  2. Back up light switch is ON for 0.5 seconds

  • Shift stroke sensor

  • Select stroke sensor

  • Back up light switch assembly

  • Open or short in back up light switch circuit

  • Transmission control ECU

WIRING DIAGRAM

A0137EUE02

INSPECTION PROCEDURE

Note

In shift and select stroke sensors replacement, perform [Initialization and Learning] and [Synchronization Position Calibration] after installing the sensors Click here.

If the sensors are installed without performing [Initialization and Learning] and [Synchronization Position Calibration], it may cause driving performance degradation or system component breakage.

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON and the tester ON.

    3. Select the following menu items: Powertrain / Multi-Mode M/T / Data List / T/M Reverse Switch Signal.

      Items

      [Abbreviation]

      		 Measurement Items: Display Normal Conditions Diagnostic Notes

      T/M Reverse Switch Signal

      [T/M R SW Sig]

      Transmission reverse switch signal:

      Open or Gnd

      Gnd: Transmission gear in reverse

      Open: Other than above

      		 During malfunctions, indicator shows either ON or OFF continuously, regardless of gear position
      OK
      When the shift lever is operated, the normal condition listed above is shown on the tester.

    OK

    CHECK FOR INTERMITTENT PROBLEMS

    NG

  2. INSPECT BACK UP LIGHT SWITCH ASSEMBLY

    A0136TRE01

    1. Remove the back up light switch assembly.

    2. Check the resistance when the switch condition is released and pushed.

      Standard Resistance
      Tester Connections Switch Conditions Specified Conditions
      1-2 Released 10 kΩ or higher
      1-2 Pushed Below 1 Ω

    3. Reinstall the back up light switch assembly.


    NG

    REPLACE BACK UP LIGHT SWITCH ASSEMBLY

    OK

  3. CHECK HARNESS AND CONNECTOR (BACK UP LIGHT SWITCH - TRANSMISSION CONTROL ECU)

    A0137TLE01

    1. Disconnect the back up light switch assembly connector.

    2. Disconnect the transmission control ECU connector.

    3. Check the resistance.

      Standard Resistance
      Tester Connections Specified Conditions
      RSW (A28-9) - (B24-1) Below 1 Ω
      RSW (A28-9) - Body ground 10 kΩ or higher

    4. Turn the ignition switch to ON.

    5. Measure the voltage between the terminal of the back up light switch assembly and the body ground.

      Standard Voltage
      Tester Connections Specified Conditions
      (B24-2) - Body ground 10 to 14 V

    6. Reconnect the back up light switch assembly connector.

    7. Reconnect the transmission control ECU connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT SHIFT STROKE SENSOR

    A0138U2E03

    1. Remove the shift stroke sensor.

    2. Measure the voltage between the terminals of the shift stroke sensor connector (main).


      1. Prepare 3 dry cell batteries (1.5 V) and 2 leads for connecting the batteries and the sensor.

      2. Connect the batteries in series.

      3. Connect the positive battery terminal to sensor terminal 3, and the negative battery terminal to sensor terminal 2.

      4. Check the voltage between terminals 1 and 2.

        Standard Voltage (combined dry cell battery voltage of 4.5 V)
        Sensor Angle Terminal (1-2) Output Voltage
        55° Approximately 4.05 V
        0° Approximately 2.25 V
        -55° Approximately 0.45 V
        Reference Voltage (combined dry cell battery voltage of 5.0 +- 0.3 V)
        Sensor Angle Terminal (1-2) Output Voltage
        55° Approximately 4.5 V
        0° Approximately 2.5 V
        -55° Approximately 0.5 V
    3. A0138U2E04

      Measure the voltage between the terminals of the shift stroke sensor connector (sub).


      1. Connect the positive battery terminal to sensor terminal 6, and the negative battery terminal to sensor terminal 5.

      2. Check the voltage between terminals 4 and 5.

        Standard Voltage (combined dry cell battery voltage of 4.5 V)
        Sensor Angle Terminal (4-5) Output Voltage
        55° Approximately 4.05 V
        0° Approximately 2.25 V
        -55° Approximately 0.45 V
        Reference Voltage (combined dry cell battery voltage of 5.0 +- 0.3 V)
        Sensor Angle Terminal (4-5) Output Voltage
        55° Approximately 4.5 V
        0° Approximately 2.5 V
        -55° Approximately 0.5 V

        Note


        • Do not apply more than 6 V

        • Do not use a sensor which has been dropped.

    4. Reinstall the shift stroke sensor Click here.

    5. Perform [Initialization and Learning] Click here and [Synchronization Position Calibration] Click here.


    NG

    REPLACE SHIFT STROKE SENSOR

    OK

  5. CHECK HARNESS AND CONNECTOR (SHIFT STROKE SENSOR - TRANSMISSION CONTROL ECU)

    A0136J2E03

    1. Disconnect the shift stroke sensor connector.

    2. Disconnect the transmission control ECU connector.

    3. Check the resistance.

      Standard Resistance
      Tester Connections Specified Conditions
      VCS2 (A28-30) - (M1-6) Below 1 Ω
      VSS2 (A28-29) - (M1-4) Below 1 Ω
      E2S2 (A28-28) - (M1-5) Below 1 Ω
      VCS1 (A28-19) - (M1-3) Below 1 Ω
      VSS1 (A28-18) - (M1-1) Below 1 Ω
      E2S1 (A28-17) - (M1-2) Below 1 Ω
      VCS2 (A28-30) - Body ground 10 kΩ or higher
      VSS2 (A28-29) - Body ground 10 kΩ or higher
      E2S2 (A28-28) - Body ground 10 kΩ or higher
      VCS1 (A28-19) - Body ground 10 kΩ or higher
      VSS1 (A28-18) - Body ground 10 kΩ or higher
      E2S1 (A28-17) - Body ground 10 kΩ or higher

    4. Reconnect the shift stroke sensor connector.

    5. Reconnect the transmission control ECU connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. INSPECT SELECT STROKE SENSOR

    A0138U2E03

    1. Remove the select stroke sensor.

    2. Measure the voltage between the terminals of the select stroke sensor connector (main).


      1. Prepare 3 dry cell batteries (1.5 V) and 2 leads for connecting the batteries and the sensor.

      2. Connect the batteries in series.

      3. Connect the positive battery terminal to sensor terminal 3, and the negative battery terminal to sensor terminal 2.

      4. Check the voltage between terminals 1 and 2.

        Standard Voltage (combined dry cell battery voltage of 4.5 V)
        Sensor Angle Terminal (1-2) Output Voltage
        55° Approximately 4.05 V
        0° Approximately 2.25 V
        -55° Approximately 0.45 V
        Reference Voltage (combined dry cell battery voltage of 5.0 +- 0.3 V)
        Sensor Angle Terminal (1-2) Output Voltage
        55° Approximately 4.5 V
        0° Approximately 2.5 V
        -55° Approximately 0.5 V
    3. A0138U2E04

      Measure the voltage between the terminals of the select stroke sensor connector (sub).


      1. Connect the positive battery terminal to sensor terminal 6, and the negative battery terminal to sensor terminal 5.

      2. Check the voltage between terminals 4 and 5.

        Standard Voltage (combined dry cell battery voltage of 4.5 V)
        Sensor Angle Terminal (4-5) Output Voltage
        55° Approximately 4.05 V
        0° Approximately 2.25 V
        -55° Approximately 0.45 V
        Reference Voltage (combined dry cell battery voltage of 5.0 +- 0.3 V)
        Sensor Angle Terminal (4-5) Output Voltage
        55° Approximately 4.5 V
        0° Approximately 2.5 V
        -55° Approximately 0.5 V

        Note


        • Do not apply more than 6 V

        • Do not use a sensor which has been dropped.

    4. Reinstall the select stroke sensor Click here.

    5. Perform [Initialization and Learning] Click here and [Synchronization Position Calibration] Click here.


    NG

    REPLACE SELECT STROKE SENSOR

    OK

  7. CHECK HARNESS AND CONNECTOR (SELECT STROKE SENSOR - TRANSMISSION CONTROL ECU)

    A0136J2E08

    1. Disconnect the select stroke sensor connector.

    2. Disconnect the transmission control ECU connector.

    3. Check the resistance.

      Standard Resistance
      Tester Connections Specified Conditions
      VCL2 (A28-31) - (A25-6) Below 1 Ω
      VSL2 (A28-32) - (A25-4) Below 1 Ω
      E2L2 (A28-24) - (A25-5) Below 1 Ω
      VCL1 (A28-20) - (A25-3) Below 1 Ω
      VSL1 (A28-21) - (A25-1) Below 1 Ω
      E2L1 (A28-22) - (A25-2) Below 1 Ω
      VCL2 (A28-31) - Body ground 10 kΩ or higher
      VSL2 (A28-32) - Body ground 10 kΩ or higher
      E2L2 (A28-24) - Body ground 10 kΩ or higher
      VCL1 (A28-20) - Body ground 10 kΩ or higher
      VSL1 (A28-21) - Body ground 10 kΩ or higher
      E2L1 (A28-22) - Body ground 10 kΩ or higher

    4. Reconnect the select stroke sensor connector.

    5. Reconnect the transmission control ECU connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE TRANSMISSION CONTROL ECU ASSEMBLY