2003 Isuzu Axiom Base, 4WDFACTORY OEM SERVICE PROCEDURE

High-Low Shift Motor

Fig 1: Identifying High-Low Shift Motor Components
G02804653Courtesy of ISUZU MOTOR CO.

When the TOD switch is changed to the 4L (or TOD) position from the TOD (or 4L) position, the TOD control unit drives the high-low shift motor according to the signal. The transfer is shifted to low range from high range (or to high range from low range) by the shift motor.

The high-low shift motor can run, only when the operation meets the following conditions to prevent an unexpected shift between high and low range by a operation error.

  1. The car stops. (less than 2 km/h or 1.2 mph and less than 1500 rpm.)
  2. The AT selector position is neutral.
  3. The brake is applied. (brake switch is on.)

The shift motor has a built-in encoder which watches motor rotation position. The control unit controls the rotation of the shift motor based on the position code detected by the encoder.

The encoder position plate turns together with the shift shaft and switches on or off the current from the 4 (four) fixed contact points on the case, then the control unit recognizes the rotation position of the shift motor.

Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.

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