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Area
Detecting condition
A/T hardware itself
Difference in detected
(DTC P0730)
revolution between
input shaft speed
sensor and output
shaft speed sensor is
too wide.
Transmission
No shift switch signal
range sensor cir-
is inputted or two or
cuit
more shift switch sig-
(DTC P0705)
nals are inputted at
the same time.
Transmission tem-
• A/T fluid temp. sig-
perature sensor cir-
cuit
(DTC P0710)
• A/T fluid temp. sig-
Engine speed input
Inputted engine rev.
circuit
signal is too low or
(DTC P0725)
too high.
Engine coolant
No or abnormal
temp./Barometric
engine coolant temp.
pressure signal cir-
signal is inputted
cuit
(DTC P1709)
"P" range → P, "R" range → R, "N" range → N,
"D"/"2"/"L" range "To be controlled as follows :
1) When detecting trouble at first, gear is selected well-suited
2) If A/T can transmit driving force under the above condition,
3) If A/T can not transmit driving force under the above condi-
• When vehicle running, shift range position is fixed to shift
range position right before the trouble occurred until vehicle
stop and lock-up function is turned OFF.
• When vehicle is at stop after or during detecting the trouble,
gear is fixed as the followings and lock-up function is turned
OFF.
– When 2 adjoining gear position signals are inputted.
– When 2 or more signals excepting above or no signal are
• When detecting circuit open, TCM control as fluid tempera-
nal input voltage is
ture is 100°C (212°F).
too low.
• Lock-up function is turned OFF.
nal input voltage
does not go down
although standard
value of engine
rev. signal is input-
ted.
• Engine rev. is processed as 4000 rpm.
• No compensation or judgement for gear shift control, for
which engine rev. is considered, is processed.
• Lock-up function is turned OFF.
• No compensation for gear shift control, for which engine cool-
ant temp. and barometric pressure are considered, is pro-
cessed.
• Lock -up function is turned OFF.
Fail safe function
gear calculated with parameters of each sensor's rev. num-
ber and gear position just when the trouble occurred. Lock-
up function is turned OFF.
gear is fixed the selected gear until ignition switch is turned
OFF.
tion, after once vehicle stop, gear which can transmit drive
force is searched one by one until gear is found out. After
gear is found out, position of gear is held until ignition switch
is turned OFF.
"P", "R" range → R, "R", "N" range → R,
"N", "D" range → D, "D", "2" range → D,
"2", "L" range → 2nd
inputted.
"P" range → P, "R" range → R,
"N" range → N, "D"/"2"/"L" range → 3rd
AUTOMATIC TRANSMISSION (4 A/T) 7B-9
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