Toyota Celica 1993 AT200 series Repair Manual page 308

AX-29
A U T O M A T I C T R A N S A X L E _ T R O U B L E S H O O T I N G
T T T E R M I N A L I N S P E C T I O N
1 . I N S P E C T T H R O T T L E P O S I T I O N S E N S O R S I G N A L
( a ) T u r n t h e i g n i t i o n s w i t c h O N .
D o n o t s t a r t t h o o n g i n 6 .
( b ) C o n n e c t a v o l t m e t € r t o t e r m i n a l s T T a n d E 1 .
(c) While slowly depressing th€ accelerator pedal, chack
t h a t T T t e r m i n a l v o l t a g e r i s e s , a s s h o w n .
lf the voltage does not changa in proportion to the
z
.d
.E
E
(Close) Throtrle Va ve Ope'ng A^gle (Ooa^)
-1 r_l
11
'1
O F F
O N
T T T e r m l n a l ( V )
|
G e a r P o s i t i o n
0
|
l s t
2
|
2nd
4
3 t d
6
0 / D
7
O / D L o c k
throttle op6ning angle, thero is a malfunction in tho q?":
throttlo position sensor or circuit.
*- " - '
2 , I N S P E C T B R A K E S I G N A L
(a) Depress the acce16rator pedal until the TT terminal
i n d i c a t e s I V .
(b) Depress tho brake psdal and ch€ck the voltage read-
i n g f r o m t h e T T t e r m i n a l .
Brake pedal depressed
0 v
Brake pedal released
8 V
lf not as indicated, there is a malfunction in either the
stop light switch or circuit.
3 .
I N S P E C T E A C H U P - S H I F T P O S I T I O N
( a ) W a r m u p t h e e n g i n e .
Cool!nt temDeraturo:
80'c (1 78' F)
(b) Turn the O/D switch Ol',t.
(c) Place the shift lever into the D range.
(d) During a road tost (above 10 kmlh or 6 mph) chack
that voltage at the TT terminal is as indicated below
f o r e a c h u p - s h i f t p o s i t i o n .
lf the voltage increased from 0 V to 7 V in the se-
quence shown, the control system is okay.
The charl on th6 left shows the voltmeter reading and
corresponding g ears.
HINT: Determin6 the gear position by a light shock or
c h a n g e i n e n g i n e r p m w h o n s h i f t i n g .