
bON vehiclecbOFF vehiclec
Reference page (AT- )1041,
112611251064,
1066
108210441070,
11481072,
10841076,
10741079,
11241124 11241133,
11441161,
11651167,
11771167,
11751171,
11371184
Reference page (AT- )
Numbers are arranged in order of probability.
Perform inspections starting with number one
and work up. Circled numbers indicate that the
transmission must be removed from the
vehicle.
Fluid level
Control linkage
PNP switch
Throttle (accelerator) position sensor (Adjustment)
Revolution sensor and vehicle speed sensor
Engine speed signal
Engine idling speed
Line pressure
Control valve assembly
Shift solenoid valve A
Shift solenoid valve B
Line pressure solenoid valve
Torque converter clutch solenoid valve
Overrun clutch solenoid valve
A/T fluid temperature sensor
Accumulator N-D
Accumulator 1-2
Accumulator 2-3
Accumulator 3-4 (N-R)
Ignition switch and starter
Torque converter
Oil pump
Reverse clutch
High clutch
Forward clutch
Forward one-way clutch
Overrun clutch
Low one-way clutch
Low & reverse brake
Brake band
Parking pawl components
ÐToo sharp a shock in change from
ªD3ºtoªD4º....1...24.........3.......V6..V5.
ÐAlmost no shock or clutches slipping in change
from ªD
1ºtoªD2º.1..2...35.......4............V6.
ÐAlmost no shock or slipping in change from
ªD
2ºtoªD3º.1..2...35........4.....V6.....V7.
ÐAlmost no shock or slipping in change from
ªD
3ºtoªD4º.1..2...35.........4....V6.....V7.
ÐVehicle braked by gear change from ªD
1ºto
ªD2º.1.....................V2V4...V5V3..
ÐVehicle braked by gear change from ªD
2ºto
ªD3º.1............................V2.
ÐVehicle braked by gear change from ªD
3ºto
ªD4º.1.....................V4..V3V2... .
ÐMaximum speed not attained. Acceleration
poor.1.2.....534.........
V11V10V6V7....V9V8.
Ð Failure to change gear from ªD
4ºtoªD3º. 1..2....64.5.3............V8.V7..
ÐFailure to change gear from ªD
3ºtoªD2ºor
from ªD4ºtoªD2º.1..2....534............V6.....V7.
ÐFailure to change gear from ªD
2ºtoªD1ºor
from ªD3ºtoªD1º.1..2....534............V7...V6.V8.
ÐGear change shock felt during deceleration by
releasing accelerator pedal....1...24....3................ .
ÐToo high a change point from ªD
4ºtoªD3º, from
ªD3ºtoªD2º, from ªD2ºtoªD1º....12......................... .
ÐKickdown does not operate when depressing
pedal in ªD
4º within kickdown vehicle speed....12....34................... .
ÐKickdown operates or engine overruns when
depressing pedal in ªD
4º beyond kickdown
vehicle speed limit....21....34................... .
ÐRaces extremely fast or slips in changing from
ªD
4ºtoªD3º when depressing pedal.1..2...35..4...........V6V7..... .
ÐRaces extremely fast or slips in changing from
ªD
4ºtoªD2º when depressing pedal.1..2...365.4............V8....V7.
ÐRaces extremely fast or slips in changing from
ªD
3ºtoªD2º when depressing pedal.1..2...35..4..6..7.....V10V9....V8.
ÐRaces extremely fast or slips in changing from
ªD
4ºorªD3ºtoªD1º when depressing pedal.1..2...35..4............V6V7.V8.. .
Ð Vehicle will not run in any position. 1 2.....3...4........
V9V5.V6....V8V7V10
ÐTransmission noise in ªDº, ª2º, ª1º and ªRº
positions.1...................V2......... .
TROUBLE DIAGNOSIS Ð General Description
Symptom Chart (Cont'd)
AT-1058

bON vehiclecbOFF vehiclec
Reference page (AT- )1041,
112611251064,
1066
108210441070,
11481072,
10841076,
10741079,
11241124 11241133,
11441161,
11651167,
11771167,
11751171,
11371184
Reference page (AT- )
Numbers are arranged in order of probability.
Perform inspections starting with number one and
work up. Circled numbers indicate that the trans-
mission must be removed from the vehicle.
Fluid level
Control linkage
PNP switch
Throttle (accelerator) position sensor (Adjustment)
Revolution sensor and vehicle speed sensor
Engine speed signal
Engine idling speed
Line pressure
Control valve assembly
Shift solenoid valve A
Shift solenoid valve B
Line pressure solenoid valve
Torque converter clutch solenoid valve
Overrun clutch solenoid valve
A/T fluid temperature sensor
Accumulator N-D
Accumulator 1-2
Accumulator 2-3
Accumulator 3-4 (N-R)
Ignition switch and starter
Torque converter
Oil pump
Reverse clutch
High clutch
Forward clutch
Forward one-way clutch
Overrun clutch
Low one-way clutch
Low & reverse brake
Brake band
Parking pawl components
1111Failure to change from ªD3º to ª2º when changing
lever into ª2º position..712....654..3............V9..V8.
Ð Gear change from ª2
1ºtoª22º in ª2º position. . . 1........................... .
1112 Engine brake does not operate in ª1º position. .2134 . . . 65 . . . 7............
V8.V9..
Ð Gear change from ª1
1ºtoª12º in ª1º position. . 2 1........................... .
Ð Does not change from ª1
2ºtoª11º in ª1º position. ..1.2. . .43. . .5............V6.V7..
ÐLarge shock changing from ª1
2ºtoª11º in ª1º posi-
tion.........1...................V2..
Ð Transmission overheats. 1 . . 3 . . 2 4 6 . . 5........
V14V7V8V9V11.V12.V13V10.
ÐATF shoots out during operation.
White smoke emitted from exhaust pipe during
operation.1.....................
V2V3V5.V6.V7V4.
Ð Offensive smell at fluid charging pipe. 1...................
V2V3V4V5V7.V8.V9V6.
Ð Torque converter is not locked up. . .3124.68. . .7.5.....
V9......... .
Ð Torque converter clutch piston slip 1 . . 2 . . . 3 6 . . 5 4.......
V7......... .
1109 Lock-up point is extremely high or low. . . . 1 2 . . . 4 . . . 3................. .
ÐA/T does not shift to ªD
4º when driving with over-
drive control switch ªONº...213..864...57...........V10..V9.
ÐEngine is stopped at ªRº, ªDº, ª2º and ª1º posi-
tions.1.......543.2................. .
TROUBLE DIAGNOSIS Ð General Description
Symptom Chart (Cont'd)
AT-1059

9. Vehicle Does Not Creep Backward In ªRº
Position
SYMPTOM:
Vehicle does not creep backward when selecting ªRº posi-
tion.
Check A/T fluid level again.
OK
cNG
Refill ATF.
VA
NG in both ª1º
and ªRº positions
Check stall revolution with selector lever
in ª1º and ªRº positions.
OK
OK in ª1º position
NG in ªRº position
c1. Remove control valve
assembly. Refer to
AT-1124.
2. Check the following
items:
+Valves to control line
pressure (Pressure
regulator valve, pressure
modifier valve, pilot
valve and pilot filter)
+Line pressure solenoid
valve
3. Disassemble A/T.
4. Check the following
items:
+Oil pump assembly
+Torque converter
+Reverse clutch assem-
bly
+High clutch assembly
+Low & reverse brake
assembly
+Low one-way clutch
1. Remove control valve assem-
bly. Refer to AT-1124.
2. Check the following items:
+Valves to control line pressure
(Pressure regulator valve, pres-
sure modifier valve, pilot valve
and pilot filter)
+Line pressure solenoid valve
3. Disassemble A/T.
4. Check the following items:
+Oil pump assembly
+Torque converter
+Reverse clutch assembly
+High clutch assembly
Check line pressure at idle with selector
lever in ªRº position. Refer to ªLine Pres-
sure Testº, AT-1044.
OK
cNG
1. Remove control valve
assembly. Refer to
AT-1124.
2. Check the following
items:
+Valves to control line
pressure (Pressure
regulator valve, pressure
modifier valve, pilot
valve and pilot filter)
+Line pressure solenoid
valve
3. Disassemble A/T.
4. Check the following
item:
+Oil pump assembly
1. Remove oil pan.
2. Check A/T fluid condition.
NG OK
VA
Check again.
OK
cNG
1. Perform TCM input/
output signal inspection.
2. If NG, recheck TCM pin
terminals for damage or
loose connection with
harness connector.
INSPECTION END
SAT638A
SAT493G
SAT494G
SAT171B
..
.
.
.
.
.
.
DIAGNOSTIC PROCEDURES FOR SYMPTOMS
AT-1103

10. Vehicle Does Not Creep Forward In ªDº,
ª2º Or ª1º Position
SYMPTOM:
Vehicle does not creep forward when selecting ªDº, ª2º or
ª1º position.
Check A/T fluid level again.
OK
cNG
Refill ATF.
VA
Check stall revolution with selector lever in
ªDº position. Refer to ªSTALL TESTº,
AT-1041.
OK
cNG
1. Remove control
valve assembly.
Refer to AT-1124.
2. Check the following
items:
+Valves to control line
pressure (Pressure
regulator valve, pres-
sure modifier valve,
pilot valve and pilot
filter)
+Line pressure sole-
noid valve
3. Disassemble A/T.
4. Check the following
items:
+Oil pump assembly
+Forward clutch
assembly
+Forward one-way
clutch
+Low one-way clutch
+Low & reverse brake
assembly
+Torque converter
Check line pressure at idle with selector
lever in ªDº position. Refer to ªLine Pressure
Testº, AT-1044.
OK NG
1. Remove control valve assembly.
Refer to AT-1124.
2. Check the following items:
+Valves to control line pressure
(Pressure regulator valve, pressure
modifier valve, pilot valve and pilot
filter)
+Line pressure solenoid valve
3. Disassemble A/T.
4. Check the following item:
+Oil pump assembly
1. Remove oil pan.
2. Check A/T fluid condition.
OK
cNGVA
Check again.
OK
cNG
1. Perform TCM input/
output signal inspec-
tion.
2. If NG, recheck TCM
pin terminals for
damage or loose
connection with har-
ness connector.
INSPECTION END
SAT638A
SAT493G
SAT494G
SAT171B
..
.
.
.
. .
.
DIAGNOSTIC PROCEDURES FOR SYMPTOMS
AT-1104

12. A/T Does Not Shift: D1®D2Or Does Not
Kickdown: D
4®D2
SYMPTOM:
A/T does not shift from D1to D2at the specified speed.
A/T does not shift from D
4to D2when depressing accelera-
tor pedal fully at the specified speed.
Are 10. Vehicle Does Not Creep Forward
In ªDº, ª2º Or ª1º Position and 11. Vehicle
Cannot Be Started From D
1OK?
Yes
cNo
Go to 10. Vehicle Does
Not Creep Forward In ªDº,
ª2º Or ª1º Position and 11.
Vehicle Cannot Be Started
From D
1, AT-1104, 1105.
Does ªTCM INPUT SIGNALSº in
Data Monitor show damage to
PNP switch circuit?
------------------------------------------------------------------------------------------------------------------------------------OR------------------------------------------------------------------------------------------------------------------------------------
Does self-diagnosis show damage
to PNP switch circuit?
No
cYes
Check PNP switch. Refer
to AT-1091.
Check vehicle speed sensorzA/T (revolu-
tion sensor) and vehicle speed
sensorzMTR. Refer to AT-1064, 1066.
OK
cNG
Repair or replace vehicle
speed sensorzA/T (revolu-
tion sensor) and vehicle
speed sensorzMTR. Refer
to AT-1064, 1066.
Check accelerator position sensor. Refer
to EC section [TROUBLE DIAGNOSIS
FOR ªTHROTTLE (ACCEL) POSI SENº
(DTC 43)].
OK
cNG
Repair or replace throttle
position sensor.
1. Remove oil pan.
2. Check A/T fluid condition.
OK
cNG
1. Remove control valve.
Refer to AT-1124.
2. Check the following
items:
+Shift valve A
+Shift solenoid valve A
+Pilot valve
+Pilot filter
3. Disassemble A/T.
4. Check the following
items:
+Servo piston assembly
+Brake band
+Oil pump assembly
1. Remove control valve. Refer to
AT-1124.
2. Check the following items:
+Shift valve A
+Shift solenoid valve A
+Pilot valve
+Pilot filter
OK
OK
b
Check again.
OK
cNG
1. Perform TCM input/
output signal inspection.
2. If NG, recheck TCM pin
terminals for damage or
loose connection with
harness connector.
INSPECTION END
SAT146BA
SAT222JA
SAT171B
.
.
.
.
.
. .
.
DIAGNOSTIC PROCEDURES FOR SYMPTOMS
AT-1106

14. A/T Does Not Shift: D3®D4
SYMPTOM:
+A/T does not shift from D3to D4at the specified speed.
+A/T must be warm before D
3to D4shift will occur.
Are 10. Vehicle Does Not Creep Forward
In ªDº, ª2º Or ª1º Position and 11. Vehicle
Cannot Be Started From D
1OK?
Yes
cNo
Go to 10. Vehicle Does
Not Creep Forward In ªDº,
ª2º Or ª1º Position and 11.
Vehicle Cannot Be Started
From D
1, AT-1104, 1105.
Does self-diagnosis, after cruise
test, show damage to any of the
following circuits?
+PNP switch
+Overdrive control switch
+A/T fluid temperature sensor
+Vehicle speed sensorzA/T
(Revolution sensor)
+Shift solenoid valve A or B
+Vehicle speed sensorzMTR
No
cYes
Check damaged circuit.
Refer to AT-1064, 1066,
1070, 1072 or 1091.
Check accelerator position sensor. Refer
to EC section [TROUBLE DIAGNOSIS
FOR ªTHROTTLE (ACCEL) POSI SENº
(DTC 43)].
OK
cNG
Repair or replace throttle
position sensor.
1. Remove oil pan.
2. Check A/T fluid condition.
OK
cNG
1. Remove control valve
assembly. Refer to
AT-1124.
2. Check the following
items:
+Shift valve B
+Overrun clutch control
valve
+Shift solenoid valve B
+Pilot valve
+Pilot filter
3. Disassemble A/T.
4. Check the following
items:
+Servo piston assembly
+Brake band
+Torque converter
+Oil pump assembly
1. Remove control valve assembly. Refer
to AT-1124.
2. Check the following items:
+Shift valve B
+Overrun clutch control valve
+Shift solenoid valve B
+Pilot valve
+Pilot filter
OK
OK
b
Check again.
OK
cNG
1. Perform TCM input/
output signal inspection.
2. If NG, recheck TCM pin
terminals for damage or
loose connection with
harness connector.
INSPECTION END
SAT833HA
SAT222JA
SAT171B
.
.
.
.
. .
.
DIAGNOSTIC PROCEDURES FOR SYMPTOMS
AT-1108

18. Engine Speed Does Not Return To Idle
(Light Braking D
4®D3)
SYMPTOM:
+Engine speed does not smoothly return to idle when A/T
shifts from D
4to D3.
+Vehicle does not decelerate by engine brake when turn-
ing overdrive control switch OFF.
+Vehicle does not decelerate by engine brake when shift-
ing A/T from ªDº to ª2º position.
Does self-diagnosis show damage to
overrun clutch solenoid valve circuit after
cruise test?
No
cYes
Check overrun clutch sole-
noid valve. Refer to
AT-1074.
Check accelerator position sensor. Refer
to EC section [TROUBLE DIAGNOSIS
FOR ªTHROTTLE (ACCEL) POSI SENº
(DTC 43)].
OK
cNG
Repair or replace throttle
position sensor.
1. Remove oil pan.
2. Check A/T fluid condition.
OK
cNG
1. Remove control valve
assembly. Refer to
AT-1124.
2. Check the following
items:
+Overrun clutch control
valve
+Overrun clutch reducing
valve
+Overrun clutch solenoid
valve
3. Disassemble A/T.
4. Check the following
items:
+Overrun clutch assembly
+Oil pump assembly
1. Remove control valve assembly. Refer
to AT-1124.
2. Check the following items:
+Overrun clutch control valve
+Overrun clutch reducing valve
+Overrun clutch solenoid valve
OK
OK
b
Check again.
OK
cNG
1. Perform TCM input/
output signal inspection.
2. If NG, recheck TCM pin
terminals for damage or
loose connection with
harness connector.
INSPECTION END
SAT836H
SAT222JA
SAT171B
.
.
.
. .
.
DIAGNOSTIC PROCEDURES FOR SYMPTOMS
AT-1111

20. A/T Does Not Shift: D2®D1When
Depressing Accelerator Pedal
SYMPTOM:
A/T does not shift from D2to D1when depressing accelera-
tor pedal fully at the specified speed.
Are 9. Vehicle Does Not Creep Backward
In ªRº Position and 10. Vehicle Does Not
Creep Forward In ªDº, ª2º Or ª1º Position
OK?
Yes
cNo
Go to 9. Vehicle Does Not
Creep Backward In ªRº
Position and 10. Vehicle
Does Not Creep Forward In
ªDº, ª2º Or ª1º Position,
AT-1103, 1104.
Does ªTCM INPUT SIGNALº show
damage to PNP switch circuit?
------------------------------------------------------------------------------------------------------------------------------------OR------------------------------------------------------------------------------------------------------------------------------------
Does self-diagnosis show damage
to PNP switch circuit?
No
cYes
Check PNP switch.
Refer to AT-1091.
Check vehicle speed sensorzA/T (revolu-
tion sensor) and vehicle speed
sensorzMTR. Refer to AT-1064, 1066.
OK
cNG
Repair or replace vehicle
speed sensorzA/T (revolu-
tion sensor) and vehicle
speed sensorzMTR.
Check accelerator position sensor. Refer
to EC section [TROUBLE DIAGNOSIS
FOR ªTHROTTLE (ACCEL) POSI SENº
(DTC 43)].
OK
cNG
Repair or replace throttle
position sensor.
1. Remove oil pan.
2. Check A/T fluid condition.
OK
cNG
1. Remove control valve.
Refer to AT-1124.
2. Check the following
items:
+Shift valve A
+Shift solenoid valve A
+Pilot valve
+Pilot filter
3. Disassemble A/T.
4. Check the following
items:
+Servo piston assembly
+Brake band
+Oil pump assembly
1. Remove control valve. Refer to
AT-1124.
2. Check the following items:
+Shift valve A
+Shift solenoid valve A
+Pilot valve
+Pilot filter
OK
b
OK
Check again.
OK
cNG
1. Perform TCM input/
output signal inspection.
2. If NG, recheck TCM pin
terminals for damage or
loose connection with
harness connector.
INSPECTION END
SAT146BA
SAT222JA
SAT171B
.
.
.
.
.
.
.
DIAGNOSTIC PROCEDURES FOR SYMPTOMS
AT-1113