AUTOMATIC TRANSAXLE SYSTEM FAIL-SAFE CHART


  1. Description

    The fail-safe function minimizes the loss of operation when a malfunction occurs in a sensor or solenoid.

  2. Fail-safe


    1. Fail-safe control list:

      Malfunctioning Part Function
      Transmission Revolution Sensor (NT)

      • Shifting to 2nd and 8th gear is prohibited.

      • Lock up clutch control is prohibited.

      • AI-SHIFT* control is prohibited.

      • High response gear shifts are prohibited.
      Transmission Revolution Sensor (NC3)

      • Lock up clutch control is prohibited.

      • AI-SHIFT* control is prohibited.

      • High response gear shifts are prohibited.
      Transmission Revolution Sensor (NC)

      • Shifting to 2nd and 8th gear is prohibited.

      • Lock up clutch control is prohibited.

      • AI-SHIFT* control is prohibited.

      • High response gear shifts are prohibited.
      Shift solenoid valve SL1, SL2, SL3, SL4, SL5 and S1 If the ECM detects a solenoid valve malfunction, it performs fail-safe control.
      ATF temperature sensor

      • Shifting to 2nd, 6th, 7th and 8th gear is prohibited.

      • Lock up clutch control is prohibited.

      • High response gear shifts are prohibited.
      ECM power supply (voltage is low)

      • When driving in 1st to 7th gear when a malfunction is detected, the transaxle will be fixed in 7th gear.

      • When driving in 8th gear when a malfunction is detected, the transaxle will be fixed in 8th gear.
      Knock sensor

      • When driving in 1st to 5th gear when a malfunction is detected, up-shift to 6th or higher will be prohibited.

      • When driving in 6th gear or higher when a malfunction is detected, up-shift to a higher gear will be prohibited.

      • Lock up clutch control is prohibited.

      • High response gear shifts are prohibited.
      CAN communication

      • Shifting to only 1st or 3rd gear is allowed.

      • Lock up clutch control is prohibited.

      • High response gear shifts are prohibited.
      Shift solenoid valve SLU Lock up clutch control is prohibited.
      Shift solenoid valve SLT

      • Engine output is limited.

      • High response gear shifts are prohibited.

      Tech Tips

      *: In addition to the switching of the shift pattern through the pattern select switch, Artificial Intelligence Shift (AI-SHIFT) control enables the ECM to estimate the road conditions and driver intention in order to automatically select the optimal shift pattern.

    2. Shift Solenoid Valve Normal Operation Chart:

      Gear 1st 2nd 3rd 4th 5th 6th 7th 8th
      Shift Solenoid Valve SL1 ON ON ON ON ON OFF OFF OFF
      Shift Solenoid Valve SL2 OFF OFF OFF OFF ON ON ON ON
      Shift Solenoid Valve SL3 OFF OFF ON OFF OFF OFF ON OFF
      Shift Solenoid Valve SL4 OFF OFF OFF ON OFF ON OFF OFF
      Shift Solenoid Valve SL5 OFF ON OFF OFF OFF OFF OFF ON

    3. Fail-safe Control Chart:

      A01VTK8E05

      Tech Tips


      • *1: Operation of fail-safe is canceled the first time the vehicle is stopped.

      • *2: Operation of fail-safe is not canceled for subsequent times the vehicle is stopped.

      • *3: Operation of fail-safe is canceled at the start of the next trip.

      • *4: Operation of fail-safe is not canceled, as the vehicle was stopped on the previous trip.

      • *5: For a shift solenoid valve SL1 OFF malfunction, the 3rd trip is started with the fail-safe ON.

      • Fail-safe operation is performed when the ECM detects a malfunction.

      Fail-safe Control Chart (Shift Solenoid Valve SL1)
      Gear Under Normal Conditions 1st 2nd 3rd 4th 5th 6th 7th 8th

      ON malfunction

      (without fail-safe control)

      		 1st 2nd 3rd 4th 5th 5th 5th 5th
      Fail-safe control during ON malfunction 1st 2nd 3rd 4th 5th 5th 5th 5th

      OFF malfunction

      (without fail-safe control)

      		 N N N N N 6th 7th 8th
      Fail-safe control during OFF malfunction 6th 6th 6th 6th 6th 6th 7th 8th
      If vehicle is stopped once, fixed in 3rd
      Fail-safe Control Chart (Shift Solenoid Valve SL2)
      Gear Under Normal Conditions 1st 2nd 3rd 4th 5th 6th 7th 8th

      ON malfunction

      (without fail-safe control)

      		 5th 5th 5th 5th 5th 6th 7th 8th
      Fail-safe control during ON malfunction 5th 5th 5th 5th 5th 6th 7th 8th

      OFF malfunction

      (without fail-safe control)

      		 1st 2nd 3rd 4th 1st N N N

      Fail-safe control during OFF malfunction

      (when electrical malfunction detected in any gear between 5th and 8th)

      		 Fixed in 7th

      Fail-safe control during OFF malfunction

      (until vehicle is stopped)

      		 1st 2nd 3rd 4th 4th 4th 4th 4th

      Fail-safe control during OFF malfunction

      (when electrical malfunction detected in any gear between 1st and 4th or malfunction detected in any gear between 1st and 8th)

      		 1st 2nd 3rd 4th 4th 4th 4th 4th
      Fail-safe Control Chart (Shift Solenoid Valve SL3)
      Gear Under Normal Conditions 1st 2nd 3rd 4th 5th 6th 7th 8th

      ON malfunction

      (without fail-safe control)

      		 3rd 3rd 3rd 3rd 7th 7th 7th 7th

      Fail-safe control during ON malfunction

      (when malfunction detected in any gear between 1st and 3rd)

      		 Fixed in 3rd

      Fail-safe control during ON malfunction

      (when malfunction detected in any gear between 4th and 8th)

      Fixed in 7th

      (If vehicle stops once, fixed in 3rd)

      OFF malfunction

      (without fail-safe control)

      		 1st 2nd 1st 4th 5th 6th N 8th
      Fail-safe control during OFF malfunction 1st 2nd 4th 4th 5th 6th 6th 6th
      Fail-safe Control Chart (Shift Solenoid Valve SL4)
      Gear Under Normal Conditions 1st 2nd 3rd 4th 5th 6th 7th 8th

      ON malfunction

      (without fail-safe control)

      		 4th 4th 3rd 4th 4th 6th 6th 6th

      Fail-safe control during ON malfunction

      (when malfunction detected in any gear between 1st and 4th)

      		 Fixed in 4th

      Fail-safe control during ON malfunction

      (when malfunction detected in any gear between 5th and 8th)

      Fixed in 6th

      (If vehicle stops once, fixed in 4th)

      OFF malfunction

      (without fail-safe control)

      		 1st 2nd 3rd 1st 5th N 7th 8th
      Fail-safe control during OFF malfunction 1st 2nd 3rd 5th 5th 5th 5th 5th
      Fail-safe Control Chart (Shift Solenoid Valve SL5)
      Gear Under Normal Conditions 1st 2nd 3rd 4th 5th 6th 7th 8th

      ON malfunction

      (without fail-safe control)

      		 2nd 2nd 3rd 4th 5th 6th 7th 8th

      Fail-safe control during ON malfunction

      (when malfunction detected in 1st or 2nd)

      		 Fixed in 2nd

      Fail-safe control during ON malfunction

      (when malfunction detected in any gear between 3rd and 8th)

      Fixed in 8th

      (If vehicle stops once, gear changes are performed with a shift map specific to 2nd through 8th gear)

      OFF malfunction

      (without fail-safe control)

      		 1st 1st 3rd 4th 5th 6th 7th N
      Fail-safe control during OFF malfunction 1st 3rd 3rd 4th 5th 6th 7th 7th
      Fail-safe Control Chart (Shift Solenoid Valve S1)
      Gear Under Normal Conditions 1st 2nd 3rd 4th 5th 6th 7th 8th

      ON malfunction

      (without fail-safe control)

      		 1st 2nd 1st 4th 5th 6th N 8th
      Fail-safe control during ON malfunction 1st 2nd 4th 4th 5th 6th 6th 6th

      OFF malfunction

      (without fail-safe control)

      1st

      (3rd)*

      		 2nd 3rd 4th 5th 6th 7th 8th
      Fail-safe control during OFF malfunction Fixed in 4th
      Fail-safe Control Chart (Shift Solenoid Valve SLT)
      Gear Under Normal Conditions 1st 2nd 3rd 4th 5th 6th 7th 8th

      ON malfunction

      (without fail-safe control)

      (clutch slipping in any gear due to low line pressure)

      		 1st 2nd 3rd 4th 5th 6th 7th 8th

      Fail-safe control during ON malfunction

      (during engine torque reduction)

      		 1st 2nd 3rd 4th 5th 5th 5th 5th

      Tech Tips


      • In the case of an open or short, the ECM stops sending current to the open or shorted solenoid.

      • *: With D1 or M1 (1st gear) selected