CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM DIAGNOSIS SYSTEM


  1. DESCRIPTION


    1. When troubleshooting Europe On-Board Diagnostic (Euro-OBD) vehicles, the vehicle must be connected to an OBD scan tool (complying with ISO 15765-4). Various data output from the vehicle's ECM can then be read.

    2. A0054YM

      Euro-OBD regulations require that the vehicle's on-board computer illuminate the Malfunction Indicator Lamp (MIL) on the instrument panel when the computer detects a malfunction in:


      • The emission control system/components

      • The powertrain control components (which affect vehicle emissions)

      • The computer itself

      In addition, the applicable Diagnostic Trouble Codes (DTCs) prescribed by ISO 15765-4 are stored in the ECM memory. If the malfunction does not recur in 3 consecutive trips, the MIL turns off automatically but the DTCs remain stored in the ECM memory.

    3. To check DTCs, connect the GTS or OBD scan tool to the Data Link Connector 3 (DLC3) of the vehicle. The scan tool displays DTCs, the freeze frame data and a variety of engine data.

      The DTCs and freeze frame data can be cleared using the scan tool Click here.

  2. NORMAL MODE AND CHECK MODE


    1. GTS only:

      The diagnosis system operates in normal mode during normal vehicle use. In normal mode, 2-trip detection logic is used to ensure accurate detection of malfunctions. Check mode is also available to technicians as an option. In check mode, 1-trip detection logic is used when reproducing malfunction symptoms for increasing the ability of the system to detect malfunctions, including intermittent malfunctions.

  3. 2-TRIP DETECTION LOGIC


    1. When a malfunction is first detected, the malfunction is temporarily stored in the ECM memory (1st trip). If the same malfunction is detected during the subsequent driving cycle, the MIL is illuminated (2nd trip).

  4. FREEZE FRAME DATA


    1. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was moving or stationary, whether the engine was warmed up or not and whether the air-fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

    2. A0054QGE04
      *1 DTC is stored
      *2 0.5 seconds
      *3 Freeze frame data which can be read

      The GTS displays freeze frame data recorded at five different points: 1) 3 times before the DTC is stored, 2) once when the DTC is stored, and 3) once after the DTC is stored. The data can be used to reproduce the vehicle condition around the time of the malfunction. The data may be helpful in determining the cause of a malfunction. It may also be helpful in determining whether a DTC is being caused by a temporary malfunction.

  5. LIST OF FREEZE FRAME DATA

    Tester Display
    Vehicle Speed
    Engine Speed
    Calculate Load
    MAF
    Coolant Temp
    Throttle Motor DUTY
    N Range Status
    Starter Signal
    Neutral Position SW Signal
    Stop Light Switch
    A/C Signal
    Closed Throttle Position SW
    TC and TE1
    SPD (NT)
    Shift SW Status (P Range)
    Pattern Switch (PWR/M)
    Shift SW Status (R Range)
    Shift SW Status (N Range)
    Shift SW Status (N,P Range) Supported
    Shift SW Status (N,P Range)
    Sports Shift Up SW
    Sports Shift Down SW
    Sports Mode Selection SW
    Shift SW Status (D Range)
    A/T Oil Temperature 1
    ATF Thermal Degradation Estimate
    NT Sensor Voltage
    SPD (NIN)
    SPD (NOUT)
    NOUT Sensor Voltage
    A/T Oil Pressure
    G Sensor
    Lock Up
    Shift Status
    Solenoid (SLS)
    SLU Solenoid Status
    SL Solenoid Status
    Solenoid(SC)
    Solenoid(SLP)
    G Sensor Calibration
    G Sensor Learning Value
    CVT Oil Press Calibration

  6. CHECK DATA LINK CONNECTOR 3 (DLC3)


    1. Check the DLC3 Click here.

  7. CHECK BATTERY VOLTAGE

    If voltage is below 11 V, replace or recharge the battery before proceeding to the next step.

  8. MIL (Malfunction Indicator Lamp)


    1. Check that the MIL illuminates when the ignition switch is turned to ON.

      If the MIL does not illuminate, there is a problem in the MIL circuit Click here.

    2. When the engine is started, the MIL goes off.