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7B-10 AUTOMATIC TRANSMISSION (4 A/T)
Area
Throttle position
signal circuit
(DTC P1700)
Transmission con-
trol system electri-
cal
(DTC P0702)
Internal malfunc-
tion of TCM
(DTC P1702)
Operation of shift solenoid valves and TCC solenoid valve
Detecting condition
No or abnormal throt-
• Scheduling of automatic gear shift is performed as throttle
tle opening signal is
inputted
• Control of automatic gear shift (i.e. control of oil pressure) is
• Coast down shifting is performed when brake is applied and
• Lock-up function is turned OFF.
Solenoid power sup-
• When relay shorted, the gear is fixed as the followings and
ply relay output volt-
age is too high
although TCM orders
relay to turn off or
• When relay open, power supply to all solenoids is cut and the
relay output voltage is
too low although TCM
orders relay to turn
on.
Incorrect calculations
Power supply to all solenoid is cut and the gear is fixed as fol-
of checking TCM pro-
lows :
grammed data indi-
"P" range P, "R" range R, "N" range N,
cated.
"D"/"2"/"L" range "3rd
Fail safe function
valve opening is 0%.
performed as throttle valve opening is 100%.
engine rev. is less than 1,500 rpm.
lock-up function is turned OFF.
"P" range → P, "R" range → R, "N" range → N,
"D" range → 3rd, "2" range → 2nd, "L" range → 1st
gear is fixed as the followings. Lock-up function is turned
OFF.
"P" range → P, "R" range → R, "N" range → N,
"D"/"2"/"L" range → 3rd
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