Transfer High-Low Shift Range - Toyota Hilux Surf 1993 Owner's Manual

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when a high–low shift change is made within these ranges the ECM operates the No.4 solenoid which car-
ries out the high–low transfer shift. However, if a transfer is attempted outside the shifting possibility range,
the high–low shift will not take place until the vehicle speed and throttle opening angle come within the ap-
propriate range. The high–low shifting possibility ranges are shown in the diagrams below.
There are three shifting possibility ranges for when the transmission gear is in first, second or third gear,
which combine with the respective transmission shift positions (L, 2, D).
Although the high–) low shift takes place in the 1st gear, 2nd gear and 3rd gear shifting positions with the
gears in 1st gear, 2nd gear and 3rd gear respectively, when a high–low shift change is made in 1st gear
while in the 2nd gear shifting possibility range only after the transmission has shifted up into second gear
does the high–low shift take place. In the 2 position and D position high–low shifting possibility ranges
where the 1st and 2nd positions overlap, the high–low shift will take place in first gear if the transmission is
in first gear, or in second gear if the transmission is in second gear.
L Position: High–Low Shift Possibility Range
AUTOMATIC TRANSMISSION
TRANSFER HIGH–LOW SHIFT RANGE
The A340H transfer differs from previous manual trans–
fer in that high–low shifting is possible while the vehicle is
in motion, though it is not possible at all vehicle speeds or
throttle opening angles. The shifting possibility ranges for
high–low shifting have been adopted with the idea of im–
proving shifting performance and transfer conditions, and
preventing engine overrun.
The shifting possibility ranges are controlled by ECM and
* : This transfer shift is only possible when the I D L contact
points of the throttle position sensor are ON.
– Troubleshooting (Automatic Shift Schedule)