Turbo Models

The fail-safe control function ensures minimum level of driveability even if a fault should occur in the vehicle speed sensors, throttle position sensor, inhibitor switch, or any of the solenoids.

• Front and rear vehicle speed sensors

  A dual speed-sensing system is used. The speed signal is taken from the transmission (by the output shaft speed sensor). Even if one sensor system fails, the vehicle can be controlled normally with the other normally operating sensor system.

  If both the front and rear vehicle speed sensors become faulty, the vehicle is made to operate only in the 3rd speed.

• Throttle position sensor

  If the throttle position sensor becomes faulty, control will be maintained by assuming that the throttle opening is at a certain angle.

• Inhibitor switch

  If the TCM receives different signals simultaneously from a faulty inhibitor switch, it selects a range in the following priority:

  D > N (P) > R > 3 > 2 > 1 >

• Line pressure linear solenoid

  If the line pressure linear solenoid fails, the solenoid is de-energized and the line pressure is raised to the maximum to enable the vehicle to operate.

• Lockup duty solenoid

  If the lockup duty solenoid fails, the solenoid is de-energized and the lockup clutch is disengaged.

• Transfer duty solenoid

  When the transfer duty solenoid becomes faulty, it is de-energized. This causes oil pressure to the transfer clutch to be interrupted and no power is transmitted to the rear axle (FWD state).

• 2-4 brake duty solenoid

  If a fault occurs in the 2-4 brake duty solenoid, the solenoid is de-energized and the gears are limited to the 1st and 3rd.

• Low clutch duty solenoid

  If a fault occurs in the low clutch duty solenoid, the solenoid is de-energized and the gears are limited to the 1st and 3rd.

• High clutch duty solenoid

  If a fault occurs in the high clutch duty solenoid, the solenoid is de-energized and the gears are limited to the 1st and 3rd.

• Torque converter turbine speed sensor

  If a fault occurs in the torque converter turbine speed sensor, the gears are limited to the 3rd speed.

• Low & reverse duty solenoid

  If a fault occurs in the low and reverse duty solenoid, the solenoid is de-energized and the gears are limited to the 1st.