GENERAL SERVICE NOTICE
Oil Channel
Oil channels which connect components are
located in the
areas shown below.
OIL CHANNELS IN OIL PUMP
Oil pump cover ride
11 pump suction hole Cooler in pressure
011 pump discharge hold LTorque converter in pressure
Oil pump housing ride
ne oressure
SAT499
SAT500
OIL CHANNELS IN TRANSMISSION CASE
Front face rlde
Front & 0 D lubrication Forward clutch (Rear1
gh-reverse clutch
011 pump discharge hole
Direct clutch apply &OD sew0 release pressure
0 0 indicator pressure
SAT501
Lower face side
Governor pressure (To control valve)
Governor feed
(From control
valve)
LOW & reverse brake
High-reverse clutch IFrontl pressure SAT502
ii
OIL CHANNELS IN O.D. CASE
011 pump suction hole Hlgh-reverse clutch (Front1 pressure
Forward clutch
(Rear) Oresure
ront & 0 D lubrication
SAT645 In regards to oneway plug. refer to page AT-32.
AT-6
GENERAL SERVICE NOTICE
I (Cont'd) Oil Cham
OIL CHANNELS IN DRUM SUPPORT OIL CHANNELS IN CONVERTER HOUSING
To lock-up ~ontrol valve
rDrain (E4N71Bl
clutch (Front)
Forward clutch
clutch pressure Front & 0 0 lubrmtmn
SAT706
3peration Mechanic:
In the E4N71B and 4N71B automatic transmission, each part operates as shown in the following table at
each gear select position
'arking
pawl
Htgh-
'everse
Front) Forward clutch (Rear) 0 D band servo Direct
clutch Range -
Release
ON ON
1 Reverse 1 ON 1 ION) ON
+-
ON I
I Neutral I ON I (ON) ON
T-
ON
-
ON
-
ON
ON
JT
I ION
'34
(0 D 1 ON I ON
Second I ON I (ON) ON
1 ON I (ON) 12
(Second) ON ON I ON
ON ord ON I I ON
The low & reverse brake IS applied In "1 I" range to prevent free wheeling when coasting and allows engine braking.
AT-7
TROUBLE-SHOOTING AND DIAGNOSES
Pressure Testing (Cont'd)
Intake manifold
vacuum
kPa (mmHg,
inHsl
VG30E engine without turbo
Propeller $haft
Vehicle speed revolutions
kmlh (MPH)
rpm
Range I Line pressure kPa (kglcm', psi)
Intake manifold
vacuum
kPa (mrnHg.
inHg) ~
R I 1,961 - 2,393
(20 0.24 4,284 .347)
Propeller shaft Vehicle speed
kmlh (MPH) revolutions
rpm
D I 1.079-1,226(110-125,156-178)
2 I 1,079 - 1,275 (11 0.13 0, 156 - 185)
1 I 1,079 - 1,226 (1 1 0 - 12 5, 156 - 178)
VG30E turbo engine
Range I Line pressure kPa (kgtcm', psi)
R I 1,961 - 2,354 (20 0 - 24 0,284 - 341)
D I 1,667 - 1,883 (17 0- 19 2,242 -273)
2 I 1.667-1,883(170-192,242-273)
1 I 1.667-1.8831170-192.242-273)
Judgment by measuring line pressure
If line pressure does not rise, first check to make
sure that vacuum
hose is connected properly.
1) When line pressure is low at all positions, the
problem may be due to
Wear on interior of oil pump
Oil leakage at or around oil pump, control
valve body, transmission case or governor
Sticking pressure regulator valve
Sticking pressure modifier valve
2) When line pressure is low at a particular posi-
tion, the problem may be due to the following
If oil leaks at or around forward clutch (rear)
or governor, line pressure
is low in "D", "2" or
"1" range but is normal in "R" range.
If oil leaks at or around low and reverse brake
circuit, line pressure becomes low in
"R" or
"P" range but IS normal in "D", "2" or "1"
range.
3) When line pressure is high, pressure regulator
valve may have stuck
Cutdown point
The cut-down point indicates
a point where line
pressure changes from high to low value.
Before proceeding cut-down testing, make sure
that line pressure "At Idle" and "At
Stall'' is
normal
Install vacuum gauge
VG30E engine without turbo
28 - 37
o(o'o) I (17-231 I 900- 1,200
12.22
(7 - 14) I 400-700 (-100. -133 -3 94) I
VG30E turbo engine
+467 I 29 - 39 1,200- 1,600 (+350, +13 78) (18 - 24)
13.23
(-200,
-267 -7 871 I (8. 14) 400 - 800
Judgment by cut-down testing
(1) When cut-down point disappears, the problem
Sticking pressure modifier valve
Sticking governor valve
Oil leaks at oil passage
(2) When cut-down point is too low or too high,
the problem may be due to
Incorrect springs (at pressure modifier valve
or governor valve)
Oil leaks at oil passage
may be due to
AT-92
