Page 877 of 1865
OUTLINE 7B
Transaxle Case
Inlet to control valve body
Outlet coasting clutch
Outlet to reverse clutch
Outlet to forward clutch
Oil Pump
Outlet to oil pump
Outlet for lubrication
Outlet to forward clutch
Inlet to oil pump^
Outlet to reverse clutch
Outlet to coasting clutch
Outlet to control valve body
Inlet for lubrication
Inlet to forward clutch Inlet to coasting clutch
Inlet to reverse clutch
76G07B-010
76G07B-011
7B—11
Page 880 of 1865
7B TROUBLESHOOTING (G4A-EL)
ON VEHICLE-
-f-
—OFF VEHICLE
\ Inspection point
and
\ reference page
Condition
•
Electronic control system Prelim-
inary
Hydraulic
control
system
Power train \ Inspection point
and
\ reference page
Condition
•
7B-66
m CO I m r--
7B-63
i
cn to I m
Section
4B
|
Section
4B
|
ID to i m
CO CO 1 CD
7B-68
|
en CO 1 IX)
to 1 00 r-.
cn CD 1 CO
7B-69
|
1 CD r--
i no
cn s-1 m
Section
4B
r*-cn
S-1 CD h-
"=1-
rJ CO
7 CD r-
(XI o
1 m
cn CM 1 CD
7B-107
|
CD
7 CD 7 m
I
7B-113
I
CO CM
7 CO r-.
m cn
7 CO r-.
cn
7 DO r-
CM CM
7 CO
|
7B-126
7 00 r-
CO
7 cn
1*-r*-
7 m r-
\ Inspection point
and
\ reference page
Condition
•
Brake
light
switch
|
Inhibitor
switch
|
Mode
switch
|
1
CO. •o o X
Idle
switch
Throttle
sensor
|
Water
temp,
switch
|
0 tn c 0) cn
s
ffi
Q tn 01 o Hi >
Pulse
generator
|
"a o c 0) a to CM
TJ O CL ID s CO C\l 3-4
solenoid
|
Lock-up
solenoid
I
ATF
level
and
condition
|
Selector
lever
m Xj CO CJ 03
1 sz
Idle
speed
and
Ignition
timing
Control
valves
Accumulators
Oil
pump
Hydraulic
circuit
Torque
converter
Forward
clutch
Coasting
clutch
Reverse
clutch
JT O
u TT ro 2-4
brake
band
and
servo
$ 2
B cn cii > £ "O C CO
o
XI y
o >. CO S cb a O
One-way
clutch
2
s CI Cn tz JC 5 0-
Planetary
gear
Differential
assembly
Accelerating
Vehicle does
not
move
in
D,
S,
L,
or R
range
O O O O O O O O O O 0
Accelerating
Vehicle moves
in N
range -0 0 -—
Accelerating
Excessive creep
-0 O O -—
Accelerating
No creep
at all
O o o o
o
G 0 O O
Shifting
|
No shift
O O o
o
0 O 0 0
o
o O
Shifting
|
Abnormal shift sequence
0 o O O 0
o
o 0 O o o 0 O
Shifting
|
Frequent shifting 0 o 0 0 o 0 O O 0
Shifting
|
Excessively high
or
low
shift point 0 o 0 O 0 0 o 0 O 0 0
Shifting
|
No lock-up
0 o 0 0 o 0 O O o O
Shifting
|
No kick-down o o o o
Slipping
Engine
run
away
or
slip when
starting vehicle 0 o 0 O o O
Slipping
Engine
run
away
or
slip when
up-
or
down-shifting o o o 0 o O 0 0 O
8 n cn 4S SI V)
Excessive
N to D or N to R
shift shock o O o o o O
8 n cn 4S SI V)
Excessive shift shock when
up-
shifting
or
downshifting o o o o 0 0 0 8 n cn 4S SI V) Excessive shift shock when
changing range 0 0 o 0 o
j
Noise
Transaxle noisy
in N or P
range o o 0 O
j
Noise
Transaxle noisy
in D, S, L,
or
R range o 0 0 O
I
Others
j
No engine braking o O o 0 o o
I
Others
j
No mode change o 0 o o o o o o o
O
o
0
I
Others
j
Transaxle overheats
o o
0 o 0 o 0
I
Others
j
Vehicle moves
in
"P",
or
park-ing gear
not
disengaged when
"P"
is
dis-
engaged
0 O
I
Others
j
Hold indicator flashes o
0
o
0
o
O
o — — —
I
Others
j
Engine will
not
start
o
o
O — — —
76G07B-014
7B—14
Page 888 of 1865
7B TROUBLESHOOTING (G4A-EL)
STEP 2 (PRELIMINARY INSPECTION)
In this step, the fundamental points related to the automatic transaxle are checked. These points must
be kept in the correct condition at all times in order to assure proper operation of the automatic transaxle.
1. Automatic Transmission Fluid (ATF)
Check ATF level and condition. (Refer to page 7B—71)
2. Selector Lever
Check selector lever position and adjust if necessary. (Refer to page 7B—72)
76G07B-022
3. Throttle cable
(1) Check the inner and outer cable for damage.
(2) Make sure that the accelerator operates
smoothly.
76G07B-023
4. Idle Speed
Check idle speed. (Refer to Section 4B)
5. Tire Inflation Pressure
Check tire inflation pressure. (Refer to Section 12)
76G07B-024
6. Inhibitor Switch
Check the inhibitor switch for operation. (Refer to
page 7B—65)
76G07B-025
7B-22
Page 889 of 1865
TROUBLESHOOTING (G4A-EL) 7B
7. Oil Leakage
Check for oil leakage.
(1) Warm up the ATF.
(2) Apply the parking brake and block the wheels
to prevent the vehicle from rolling.
(3) Shift the selector lever to R range.
(4) Check if oil leaks from the following oil seals
or gaskets.
(5) If oil leaks, replace the oil seal or gasket.
76G07B-026
Check for fluid leaks; the following figure shows the locations where fluid leakage may possibly occur.
1. Oil pan
2. Control valve body cover
3. Oil pump
4. Inhibitor switch
5. Speedometer driven gear
6. Pulse generator
7. Oil filler tube
8. Throttle cable
9. Bearing cover
10. Driveshaft
11. Square head plug
12. Transaxle case
13. Drain plug
14. Oil cooler return pipe
15. Oil cooler outlet pipe
16. Fluid temperature switch
17. Blind plugs
76G07B-027
7B—23
Page 898 of 1865
7B TROUBLESHOOTING (G4A-EL)
Specified line pressure:
Line pressure kPa, (kg/cm2, psi)
Range DSL R
When idling 353-432 (3.6-4.4, 51-63) 598—942 (6.1-9.6, 87—137)
At stall speed 873-1040 (8.9-10.6, 127-151) 1668-2011 (17.0-20.5, 242-292)
76G07B-032
Evaluation
Line pressure Possible location of problem
Low pressure in every position
Worn oil pump
Fluid leaking from oil pump, control valve body, or transaxle case
Pressure regulator valve sticking
Low pressure in D and S only Fluid leaking from hydraulic circuit of forward clutch
Low pressure in R only Fluid leaking from hydraulic circuit of low and reverse brake
Higher than specification
Throttle valve sticking
Throttle modulator valve sticking
Pressure regulator valve sticking
76G07B-033
7B—32
Page 907 of 1865
TROUBLESHOOTING (G4A-HL) 7B
TROUBLESHOOTING (G4A-HL)
GENERAL NOTE
In the event of a problem with the automatic transaxle, the cause may be in the engine, power train,
hydraulic control system, or electrical control system.
When troubleshooting, therefore, it is recommended to begin from those points that can be judged
quickly and easily. The recommended troubleshooting sequence is described below.
STEP 4: TIME LAG TEST
Check time lag of oil pressure supply
STEP 6: OIL PRESSURE TEST Check line, throttle, and governor pressures
This step checks conditions surrounding the automatic
transaxle.
This step checks the electrical control system.
• Function of the electrical control system
• Components
This step checks the power train. • Friction element slipping • Torque converter capacity
This step checks operation of the hydraulic control system. • Accumulators • Friction elements slipping • Regulating valves
This step checks functions of the electric control system and
hydraulic control system.
This step checks major points of the hydraulic control system.
• Oil pump • Line pressure control • Throttle pressure control
• Governer pressure control
STEP 5: ROAD TEST Check items on road test
• Shift point • Shift schedule
• Kick-down • Shift shock • Lock-up and overdrive inhibition
By following the above 6 steps, the cause of the problem should be located.
As another guide to faster location of the causes of problems, the Quick Diagnosis Chart is included
at pages 7B—42, 43.
In this chart, a circle is used to indicate the components that might be the cause of trouble for 20
types of problems. It is only necessary to check those components indicated by circles, at each step
of the troubleshooting process, in order to quickly locate the cause of the problem.
76G07B-040
7B—41
Page 909 of 1865
TROUBLESHOOTING (G4A-HL) 7B
-ON VEHICLE-OFF VEHICLE-
Accele-rating
Shifting
Slipping
Inspection point and reference page
Electrical
control
system
i
1-5
1 CD 3
a s
si "9 .i ca y
5 ^
m T
CO i CD
I ' i m cd r«. r-
Shift shock
Noise
Others
Vehicle does not move in D, 2, 1, or R range
Vehicle moves in N
range
Excessive creep
No creep at all
No shift
Abnormal shift
sequence
Frequent shifting
Excessive high or low shift point
No lock-up
No kick-down
Engine run away or slip when starting vehicle
Engine run away or slip when up- or down-shifting
Excessive N to D or N to R shift shock
Excessive shift shock when upshifting or downshifting
Excessive shift shock when changing range
Transaxle noisy in N or
P range
Transaxle noisy in
D, 2, 1, or R range
No engine braking
Transaxle
overheats
Engine will not start O
O
O
o
Prelim
i
nary
i r
o
o
o
o
o
o
o
(I) > m c > u "O ri O r c CI CD o O CO Tl O CO r CD 01 (1) O CD -<1> u < to
o
o
o
o
Hydraulic
control
system "T
(M | ro
m mim
O
O
O
o
o
o
o
o
o
o
o
o
o
o
o
o
o
o
o
o
o
o
o
o
o
0
o
o
o
10 •-.
to ,
> CL P
c/> i
61 a1 ® a
El I I =
I
a | o,8 = 2 O < O
O
o
o
o
o
o
o
o
o
o
o
0
o
o
o
o
o
o
Power train
§| 2' >
l-Oi
O >v CD I!
:
I
o
o
o
o
o
o
o
o
o
o
o
o
Q
o
o
o
o
o
o
o
o
o
o
o
o
o
"l-ol
oo
CD I CO 1
> 0 10! o cc
I o >
53
to
to cn
o
o
o
o
o
o
o
o
o
o
o
o
o
o
o
o
o
o
O J-O
m oj
CO "tf" (M CO
m m
O
o
o
o
o
o
o
I I
*" W ! j:
.c )
u o to I ^
i
51 SI ul
O
01 >,! =J >-ffl ro i o),
ca
aj
A 1
c
1
® S. S. « —IS OOQ.0.Q
^
CM
CD CO C\J
CM
o
o
o
O
O
o
o
o
o
o o
o
o
o
o
o
o
o
o
o
o
o
o o
76G07B-042
7B—43
Page 910 of 1865
7B TROUBLESHOOTING (G4A-HL)
STEP 1 (PRELIMINARY INSPECTION)
In this step, the fundamental points related to the automatic transaxle are checked. These points must
be kept in the correct condition at all times in order to assure proper operation of the automatic transaxle.
83U07B-025
1. Automatic Transaxle Fluid (ATF)
Check ATF level and condition. (Refer to page
7B-71)
76G07B-043
11
m
0 £
m
0 •
o #
m
Button need not
^ be depressed
Button must be pressed
2. Selector Lever
Check selector lever position and adjust if neces-
sary. (Refer to page 7B—72)
76G07B-044
3. Oil Leakage
Check for oil leakage.
(1) Warm up the ATF.
(2) Apply the parking brake and block the wheels
to prevent the vehicle from rolling.
(3) Shift the selector lever to R range.
(4) Check if oil leaks from the following oil seals
or gaskets.
(5) If oil leaks, replace the oil seal or gasket.
76G07B-215
7B—44
