Toyota Celica Supra 1986 Service And Repair Manual page 288

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AUTOMATIC TRANSMISSION
-
Electric Control
AT·
13
TIOUble No.
2
No
shifting
Warm up engine
Coolant temp:
so•c
1176°FJ
ATF
temp:
so- so•c
1122- 176°FI
Diagnosis
code
I Proceed
to
trouble
No.
1 IAT·121
Output
diagnostic code
!See
page
AT·
SI
No indicate
Connect
a
voltmeter
to
the
OG
terminal and body.
Does
OG
terminal voltage very
with changes
in
throttle opening
1
Yes
No
Is
voltage between
ECT ECU terminals
No
Brake
signal
BR
and GNO as follows?
faulty
OV
:
Brake
pedal
released
12V:
Brake
pedal
depressed
Yes
Computer power sourse and earth
fauhy
Throttle
position
signal
faulty
OG terminal wire open or short
OiseonMCt
ECT
ECU
connector and road test.
No
Does
the transmission
operate in
the
respective
gear
when
in
the following ranges while driving?
1 Transmission faulty
0
range
...... Overdrive
2
range
...
..
.
3rd gear
L
range
. .
..
.
1st
gear
Yes
Continued
on
page AT ·14

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