Range Rover (LM) V8-4398cc 4.4L (M62) (2003)
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Shift Interlock Solenoid: Description and Operation
Shift Interlock Solenoid
Description
The shift interlock solenoid is located at the front of the selector lever assembly. The selector lever is connected to a locking plate that has two holes that
correspond to the Park (P) and Neutral (N) positions. When the ignition is on or the engine is running, the solenoid is energized by the TCM when the
selector lever is in the Park or Neutral positions. When energized, the solenoid ejects a pin that engages in the locking plate preventing the lever from
being moved.
When the footbrake is applied, a signal from a brake switch is passed to the TCM that de-energizes the solenoid allowing the lever to be moved from the
Park or Neutral position. This prevents the selector from being moved to the Drive or Reverse position unintentionally and the application of the brakes
also prevents the vehicle 'creeping' when the gear is engaged.
Movement of the selector lever from the Park or Neutral positions is also prevented if the TCM senses that the engine speed is above 2500 rev/min,
even if the brake pedal is depressed.
There are four diagnostic checks for each shift solenoid, an error is detected if:-
1. The shift solenoid voltage is greater than 1 V but less than 1.44 V with the solenoid under current.
2. The shift solenoid voltage is greater than 0.85 V but less than 1.44 V with the solenoid not under current.
3. The shift solenoid voltage is greater than 1.44 V but less than 5 V with the solenoid under current. This indicates a short to battery positive
condition.
4. The shift solenoid voltage is greater than 0 V but less than 0.35 V with the solenoid not under current. This indicates a short to ground condition.
5. The shift solenoid voltage is greater than 0.35 V but less than 0.85 V with the solenoid not under current. This indicates an open circuit condition.
6. A rationality check monitors 2/3 and 3/4 shifts for a lack of change to the input speed or a too great change to input speed.
