СИСТЕМА МЕХАНИЧЕСКОЙ ТРАНСМИССИИ "MULTIMODE"


  1. FUNCTION OF MAIN COMPONENTS


    1. The main components of the EC65A M-MT system are as follows:

      Component Function
      Clutch Actuator Assembly Clutch Motor The clutch motor is actuated by the TCM and engages and disengages the clutch.
      Clutch Stroke Sensor Detects the amount of the clutch stroke from the rotational angle of the reduction mechanism and relays this information to the TCM in the form of feedback signals.
      Shift and Select Actuator Assembly Shift Motor The shift motor is actuated by the TCM and performs the shift operation of the shift and select lever shaft.
      Shift Stroke Sensor Detects the length of the shift stroke of the gear shift fork from the rotational angle of the shift and select lever shaft and relays this information to the TCM in the form of feedback signals.
      Select Motor The select motor is actuated by the TCM and performs the select operation of the shift and select lever shaft.
      Select Stroke Sensor Detects the length of the select stroke of the gear shift fork from the rotational angle of the shift and select lever shaft and relays this information to the TCM in the form of feedback signals.
      Shift Lock Control Unit Assembly Shift Lever Position Sensor Outputs the shift lever position or shift request ("+" or "-") from the on/off combination of the 8-contact switch.
      Transmission Shift Main Switch Outputs the shift mode (M-mode or E-mode) from the on/off signal to the TCM.
      Shift Lock Solenoid The shift lock solenoid is actuated by the TCM and restricts the movement of the shift lever.
      No. 1 Pattern Select Switch Assembly Switches the driving pattern ([E] or [Es]) in E-mode.
      Shift Paddle Switch (Transmission Shift Switch Assembly) Enables the driver to select a desired gear by operating the switch while driving in E-mode or M-mode.
      Combination Meter Assembly M-MT Warning Light Illuminates to alert the driver when a malfunction occurs in the M-MT system.
      Shift Position and Shift Range Indicator

      • Indicates the present shift lever position when the shift lever is in N or R.

      • Indicates the present gear when in M-mode or temporary M-mode.

      • Flashes if the actual gear and the shift lever position do not match.
      [E]/[Es] Indicator

      • Illuminates the [E] indicator when the normal [E] pattern is selected.

      • Illuminates the [Es] indicator when the sporty [Es] pattern is selected during the normal [E] pattern driving in E-mode.
      [M] Indicator The [M] indicator illuminates when the shift lever is in M.
      Buzzer

      • Sounds when a system malfunction is detected.

      • Sounds if the driver door is opened while the engine is idling and the shift lever is in E, M, or R.
      Accelerator Pedal Sensor Assembly Accelerator Pedal Position Sensor

      • Detects the accelerator pedal position and outputs it to the ECM.

      • Sends a kick down signal to the ECM when the accelerator pedal position sensor detects the specified accelerator pedal depression amount.
      Transmission Revolution Sensor Detects the input shaft speed of the transaxle and outputs it to the TCM.
      Park/Neutral Position Switch Assembly

      • Detects the neutral position of the transaxle and outputs it to the TCM.*1

      • Detects the neutral position of the transaxle and outputs it to the certification ECU (smart key ECU assembly).*2
      Stop Light Switch Assembly Detects that the brake pedal is depressed and outputs this information to the TCM.
      Parking Brake Switch Assembly Detects the parking brake lever operation signal and outputs it to the TCM.
      Starter Relay The TCM restricts the operation of the starter relay in accordance with the selected gear and the braking conditions in order to control the operation of the starter.
      TCM

      • Controls the M-MT system; in addition, requests the ECM to control the engine output during upshifts or downshifts via CAN communication.

      • When the TCM detects a malfunction, the TCM stores malfunction data in the form of a DTC. Furthermore, the M-MT warning light illuminates to inform the driver.
      ECM

      • Outputs information from each sensor to the TCM.

      • Performs engine output control in accordance with requests from the TCM.
      Certification ECU (Smart Key ECU Assembly)*2 Receives signals from the park/neutral position switch assembly and transmits those signals to the ECM.
      Main Body ECU (Multiplex Network Body ECU) Transmits driver side door courtesy switch signals to the ECM.

      *1: Models without entry and start system

      *2: Models with entry and start system

  2. SYSTEM CONTROL


    1. Control List


      1. The electronic control system of the EC65A M-MT consists of the controls listed below.

        Control Outline
        Engine Starting Control The TCM permits the operation of the starter to start the engine only when the brake pedal is depressed and the shift lever is in N.
        Vehicle Starting Off Control When the vehicle starts off in 1st, 2nd or reverse, the TCM partially engages the clutch. Thus, it enables the vehicle to start off slowly without requiring the operation of the accelerator pedal.
        Shifting Control

        Shifting control consists of E-mode control and M-mode control.


        • In E-mode, the TCM selects an optimal gear to suit the driving conditions.

        • In M-mode, the TCM shifts into the gear selected by the driver.

        • If the shift paddle switches (transmission shift switch) are operated in E-mode, the TCM shifts into the gear selected by the driver.
        Shift Pattern Control

        In E-mode, the driver can select from 2 shift patterns (E and Es):


        • The normal [E] pattern places emphasis on fuel economy.

        • The sporty [Es] pattern enables sporty driving.
        Kick Down Control While the vehicle is being driven in E-mode, this control enables the TCM to perform downshifts in accordance with the actual vehicle speed when the driver fully depresses the accelerator pedal.
        Uphill/Downhill Shift Control While the vehicle is being driven in E-mode, this control restricts 2nd, 3rd, 4th, 5th or 6th upshifts or provides appropriate engine braking in order to enable the TCM to determine whether the vehicle is traveling uphill or downhill.
        Delta Throttle Acceleration Control When the TCM detects the accelerator pedal rapidly being operated by the driver, the M-MT system controls shifting, restricting downshifts during accelerating and upshifts during decelerating.
        Vehicle Stopping Control

        • When the input shaft speed decreases to a predetermined level while the vehicle is in motion, the TCM disengages the clutch to prevent the engine from stalling.

        • When the vehicle is stopped and the shift lever is in E or M, this control automatically shifts to 1st gear, thus making it unnecessary for the driver to shift when the vehicle is started off again.
        Parking Control

        When the shift lever is in R, E, or M and the ignition switch is turned off, the TCM operates as follows:


        • The shift lever is locked at the current position. This prevents the shift lever position and selected gear from becoming mismatched.

        • Then, the TCM disengages the clutch with the transaxle in 1st gear or reverse to park the vehicle with the gear engaged.
        Retry Control When shifting to the target gear is not successful, the TCM retries gear shifting.
        Shift Protection Control

        When one of the following conditions are met, the TCM performs shift protection control and warns the driver protect the gears, clutch and engine:


        • Upshift occurs when the engine speed is lower than the specified value.

        • Downshift occurs when the engine speed is higher than the specified value.

        • The shift lever is moved to R when the vehicle speed is 6.0 km/h (3.7 mph) or more.

        • The shift to 1st request signal is input when the outside air temperature is low.
        Fail-safe If a malfunction is detected in the sensors or actuators, the TCM performs fail-safe control to prevent the vehicle's driveability from being affected significantly.
        Diagnosis When the TCM detects a malfunction, the TCM makes a diagnosis and memorizes the information related to the fault.

    2. Engine Starting Control


      1. When the ignition switch is turned to ON and the brake pedal is depressed, the TCM turns on the shift lock solenoid in order to release shift lock.

      2. When the shift lever is moved to N, the TCM detects that the shift lever is in N using the shift lever position sensor.

      3. When the ignition switch is turned to ON, the start signal is sent to the TCM*1 or ECM*2 through the park/neutral position switch assembly. When the ECU receives the signal, the starter relay is turned on and the engine is started.

        *1: Models without entry and start system

        *2: Models with entry and start system

        A00XR7IE01

    3. Vehicle Starting Off Control


      1. When the shift lever is in E, M or R, the TCM controls the shift and select motors to change to the appropriate gear.

      2. When the brake pedal and parking brake are released, the TCM commands the clutch motor to partially engage the clutch.

      3. As a result of the clutch being partially engaged, the vehicle can be driven slowly forward without requiring the driver to depress the accelerator pedal.

        A00XR5DE03

      4. The TCM calculates the clutch disc temperature based on information from the clutch stroke sensor, engine speed signal, and input shaft speed signal. If the TCM determines that the load applied to the clutch is large* according to this information, it sounds the buzzer in the combination meter assembly to alert the driver in order to avoid clutch disc damage.

        Tech Tips

        *: The vehicle is stopped on an incline or with a chock block when the clutch is partially engaged and the brake pedal is not depressed.

        A00XRMWE03

      5. When the engine speed is high and the shift lever is moved from N to E, M, or R, the TCM sounds the buzzer in the combination meter assembly to alert the driver and controls the clutch motor in order to prevent the vehicle from moving suddenly.

        A00XRA9E03

    4. E-mode Shifting Control


      1. In E-mode, the TCM automatically selects an optimal gear that suits the driving conditions.


        1. When the shift lever is moved to E, the TCM activates E-mode control.

        2. The TCM calculates the suitable gear according to the driving conditions determined from various signals, and controls the clutch actuator assembly and shift and select actuator assembly.

        3. The TCM sends a signal to request fuel injection control, achieving smooth shifts.

        4. The TCM can hold the gear that the driver selects by operating the "+" or "-" shift paddle switch (transmission shift switch) even in E-mode.

        5. The gear can be selected by operating the "+" or "-" shift paddle switch (transmission shift switch) similar to M-mode.

        6. If any of the following conditions is met, the system releases the gear which is held by above operation.


          • Downshifting (including decelerating, kick down, and so on)

          • The "+" switch is pressed for approximately 1 second.

          • The accelerator pedal is continuously depressed for a certain period of time.

        A00XR6BE03

    5. M-mode Shifting Control (Upshifting)


      1. In M-mode, the TCM performs gear shift control to select the gear chosen by operating the shift lever or shift paddle switch (transmission shift switch) to "+".


        1. When the shift lever is moved to M, the TCM uses M-mode control.

        2. If the shift lever or shift paddle switch (transmission shift switch) is operated to "+", the TCM controls the clutch motor to release the clutch. If the driver is depressing the accelerator pedal at this time, the TCM sends a signal to the ECM to request fuel injection control, suppressing the increase in engine speed.

        3. The TCM controls the shift and select actuator assembly to perform an upshift.

        4. The TCM controls the clutch motor to engage the clutch.

        5. If the TCM determines that the engine speed will become less than approximately 1000 rpm due to an upshift, the upshift is not performed due to shift protection control.

          A00XRTOE03

    6. M-mode Shifting Control (Downshifting)


      1. In M-mode, the TCM performs gear shift control to select the gear chosen by operating the shift lever or shift paddle switch (transmission shift switch) to "-".


        1. When the shift lever is moved to M, the TCM activates M-mode control.

        2. If the shift lever or shift paddle switch (transmission shift switch) is operated to "-", the TCM controls the clutch motor to release the clutch.

        3. The TCM controls the shift and select actuator assembly to perform a downshift.

        4. The TCM controls the clutch motor to engage the clutch.

        5. If the TCM determines that the engine speed will become too high due to a downshift, the downshift is not performed due to shift protection control, and the buzzer in the combination meter assembly sounds.

        6. While driving the vehicle with a gear selected, if the vehicle speed becomes less than the specified minimum speed for that gear, the TCM automatically downshifts to improve driveability and prevent the engine from stalling.

          A00XRMXE04

    7. Uphill/Downhill Shift Control


      1. This control minimizes gear shifting when the driver operates the accelerator pedal while driving on a winding uphill or downhill road in order to ensure comfort and driveability.

      2. When the TCM determines that the vehicle is traveling uphill and before the transaxle attempts to upshift or after it finishes downshifting, the TCM prohibits upshifting until it determines that the vehicle has finished traveling uphill.

      3. When the TCM determines that the vehicle is traveling downhill, the ECU maintains the present gear, and if the brake pedal is depressed, performs a downshift.

        A00XRUQE02

      4. The actual acceleration calculated from the vehicle speed signal is compared with the reference acceleration (based on level road travel) stored in the ECM to determine uphill or downhill travel.

        A00XRMNC02
        *a Uphill *b Downhill
        *c Smaller *d Greater
        A00XRCH Reference Acceleration A00XREL Actual Acceleration

    8. Delta Throttle Acceleration Control


      1. Delta throttle acceleration control, which operates in E-mode, has the following 2 control functions:


        • At sudden acceleration: The TCM determines that the driver intends sudden acceleration via the accelerator pedal position sensor and thus quickens the downshift timing.

        • At sudden deceleration: The TCM determines that the driver intends sudden deceleration via the accelerator pedal position sensor. Instead of upshifting, it maintains the current gear to ensure engine braking and also ensure the driving force when the accelerator is subsequently operated.

    9. Vehicle Stopping Control


      1. While driving, the TCM detects the input shaft speed based on the transmission revolution sensor signal. If the speed is less than a specified speed, the ECU partially releases the clutch to prevent the engine from stalling.

      2. If the input shaft speed exceeds a specified speed, the ECU completely engages the clutch. The specified speed differs depending on the gear.

      3. When the vehicle stopped, the ECU controls the shift and select actuator assembly to automatically downshift the vehicle to 1st gear when the shift lever is in M or E in order to start moving again.

      4. When the shift lever is in R, the gears do not shift automatically.

        A00XR9ZE01

      5. When vehicle stopping control is operating and either of the following conditions are met, the TCM sounds the buzzer in the combination meter assembly to alert the driver:


        • When all conditions listed for pattern 1 are met, the buzzer sounds after 10 seconds, and the transmission shifts to neutral.

        • When all conditions listed for pattern 2 are met, the buzzer sounds after 90 seconds, and the transmission shifts to neutral.

          Pattern 1 Pattern 2

          • Vehicle is stopped.

          • Engine is running.

          • Shift lever is in E, M or R.

          • Parking brake is applied.

          • Driver's door is opened.

          • Vehicle is stopped.

          • Engine is running.

          • Shift lever is in E, M or R.

          • Parking brake is applied.

    10. Parking Control


      1. The M-MT system has a gear parking function. Theprocedure to operate the gear parking function is as follows:


        • Apply the parking brake and move the shift lever to E, M or R. Then turn the ignition switch to ACC or off.

        • The TCM activates the shift lock function to engage the clutch.

        • As a result, the vehicle can be parked with the transaxle in a gear that corresponds to a shift lever position.

        • The selected gear is indicated on the M-MT display in the combination meter for approximately 5 seconds after the ignition switch is turned off.

          A00XRBTE01

    11. Retry Control


      1. When shifting to a target gear is not successful, the TCM retries gear shifting.

        Condition Retry Operation Warning

        • Vehicle is stopped.

        • Engine is stopped.

        • Shift lever is moved from N to E, M, or R.

        If the transaxle does not shift from neutral to the target gear, the TCM performs the following operations:


        • Returns transaxle to neutral.

        • Shifts to another gear.

        • Shifts to the target gear.

        • If the transaxle does not shift to the target gear after the above operations have been repeated a few times, the TCM stops gear shifting and stands by in neutral.

        		 Shift position indicator N blinks*

        • Vehicle is stopped.

        • Engine is running.

        • Shift lever is moved from N to E, M or R.

        If the transaxle does not shift from neutral to the target gear, the TCM performs the following operations:


        • Returns transaxle to neutral.

        • Engages and disengages the clutch once.

        • Shifts to the target gear.

        • If the transaxle does not shift to the target gear after the above operations have been repeated a few times, the TCM stops gear shifting and stands by in neutral.

        		 Shift position indicator N blinks*
        Buzzer in combination meter assembly sounds*

        • Vehicle is being driven.

        • During upshifting or downshifting.

        If the transaxle does not shift to the target gear, the TCM performs the following operations:


        • Returns transaxle to neutral.

        • Shifts again to the target gear.

        • If the transaxle does not shift to the target gear after the above operations have been repeated a few times, the TCM stops gear shifting and stands by in neutral.

        		 -

        • Vehicle is being driven.

        • Transaxle jumps out of gear.

        If the transaxle pops out of gear unintentionally, the TCM performs the following operations.


        • Returns transaxle to neutral.

        • Shift to the target gear.

        		 -

        *: During retry operation

      2. If the vehicle is standing-by in neutral due to one of the situations above, the driver should perform the following:

        Condition Retry Operation

        • Vehicle is stopped.

        • Engine is stopped.

        • Turn the ignition switch to ON.

        • Depress the brake pedal.

        • Return the shift lever to N.

        • Move the shift lever to the target position again.

        • Turn the ignition switch off.
        Vehicle is stopped with the engine running

        • Return the shift lever to N.

        • Move the shift lever to the target position again.
        Driving (Upshifting or Downshifting)

    12. Shift Protection Control


      1. To protect the transaxle gears, clutch and engine, the TCM restricts shifting when one of the conditions indicated in the table below is met:

        Condition System Operation Warning
        Upshift occurs when the engine speed is lower than the specified value. Shifting is rejected -
        Downshift occurs when the engine speed is higher than the specified value. Shifting is rejected Buzzer in combination meter assembly sounds twice
        The driver moves the shift lever to R at a vehicle speed of 6 km/h (4mph) or more. (E → R, M → R or N → R) Shifting is rejected Shift position indicator N blinks
        The driver downshifts to 1st gear at a low outside air temperature (estimated transaxle oil temperature of - 25°C or below). Shifting is rejected (2nd gear is selected) -

  3. FAIL-SAFE


    1. If a malfunction is detected in the sensors or actuators, the TCM performs fail-safe control to prevent the vehicle driveability from being affected significantly.

  4. DIAGNOSIS


    1. When the TCM detects a malfunction, the TCM makes a diagnosis and memorizes information related to the fault. Furthermore, the M-MT warning light illuminates to inform the driver.

    2. The TCM will also store Diagnostic Trouble Codes (DTCs). The DTCs can be read by connecting the Global TechStream (GTS) to the DLC3.

    3. M-MT system DTCs cannot be cleared by merely disconnecting the battery terminals. To clear a DTC that is stored in the TCM, use the Global TechStream (GTS). For details, refer to the Repair Manual.