DIAGNOSTIC WORKSHEET
1.lRead the Fail-safe and listen to customer complaints. AT-5
2. lA/T FLUID CHECK AT-27
l Leakage (Follow specified procedure)
l Fluid condition
l Fluid level
3. lPerform STALL TEST and LINE PRESSURE TEST. AT-27,
AT-30
l Stall test Ð Mark possible damaged components/others.
l Torque converter one-way clutch
l Reverse clutch
l Forward clutch
l Overrun clutch
l Forward one-way clutch l
Low & reverse brake
l Low one-way clutch
l Engine
l Line pressure is low
l Clutches and brakes except high
clutch and brake band are OK
l Line pressure test Ð Suspected parts:
4. lPerform all ROAD TEST and mark required procedures. AT-32
4-1. Check before engine is started. AT-33 l SELF-DIAGNOSTIC PROCEDURE Ð Mark detected items.
l Vehicle speed sensor×A/T (Revolution sensor), AT-52.
l Vehicle speed sensor×MTR, AT-56.
l Throttle (accelerator) position sensor, AT-62.
l Shift solenoid valve A, AT-65.
l Shift solenoid valve B, AT-68.
l Overrun clutch solenoid valve, AT-71.
l Torque converter clutch solenoid valve, AT-93.
l A/T fluid temperature sensor and TCM power source, AT-78.
l Engine speed signal, AT-82.
l Line pressure solenoid valve, AT-86.
l Park/neutral position, overdrive control, A/T check and throttle
(accelerator) position switches, AT-93.
l Battery
l Others
4-2. Check at idle AT-35 l 1. SPORT Indicator Lamp Does Not Come On, AT-97.
l 2. SPORT or SNOW Indicator Lamp Does Not Come On, AT-100.
l 3. O/D OFF Indicator Lamp Does Not Come On, AT-100.
l 4. SPORT Indicator Lamp Does Not Come On, AT-101.
l 5. Engine Cannot Be Started In ªPº And ªNº Position, AT-102.
l 6. In ªPº Position, Vehicle Moves Forward Or Backward When Pushed,
AT-102.
l 7. In ªNº Position, Vehicle Moves, AT-103.
l 8. Large Shock. ªNº ,ªRº Position, AT-104.
l 9. Vehicle Does Not Creep Backward In ªRº Position, AT-105.
l 10. Vehicle Does Not Creep Forward In ªDº, ª2º Or ª1º Position, AT-106.
4-3. Cruise test AT-36,
AT-39
Part-1
l 11. Vehicle Cannot Be Started From D
1, AT-107.
l 12. A/T Does Not Shift: D
1,D2Or Does Not Kickdown: D4,D2, AT-108.
l 13. A/T Does Not Shift: D
2,D3, AT-109.
l 14. A/T Does Not Shift: D
3,D4, AT-110.
l 15. A/T Does Not Perform Lock-up, AT-111.
l 16. A/T Does Not Hold Lock-up Condition, AT-112.
l 17. Lock-up Is Not Released, AT-112.
l 18. Engine Speed Does Not Return To Idle (Light Braking D
4,D3), AT-113.
TROUBLE DIAGNOSIS Ð Introduction
Diagnostic Worksheet (Cont'd)
AT-24
http://vnx.su/
4. Part-2l19. Vehicle Does Not Start From D
1, AT-114.
l 12. A/T Does Not Shift: D
1,D2Or Does Not Kickdown: D4,D2, AT-108.
l 13. A/T Does Not Shift: D
2,D3, AT-109.
l 14. A/T Does Not Shift: D
3,D4, AT-110. AT-41
Part-3
l 20. A/T Does Not Shift: D
2,D1When Depressing Accelerator Pedal, AT-5.
l 21. A/T Does Not Shift: D
4,D3When Overdrive Control Switch ªONº ,
ªOFFº, AT-116.
l 18. Engine Speed Does Not Return To Idle (Engine Brake In D
3), AT-113.
l 22. A/T Does Not Shift: D
3,22, When Selector Lever ªDº ,ª2º Position,
AT-116.
l 18. Engine Speed Does Not Return To Idle (Engine Brake In 2
2), AT-113.
l 23. A/T Does Not Shift: 2
2,11, When Selector Lever ª2º ,ª1º Position,
AT-5.
l 24. Vehicle Does Not Decelerate By Engine Brake, AT-117.
l SELF-DIAGNOSTIC PROCEDURE Ð Mark detected items. AT-42
l Vehicle speed sensor×A/T (Revolution sensor), AT-52.
l Vehicle speed sensor×MTR, AT-56.
l Throttle (accelerator) position sensor, AT-62.
l Shift solenoid valve A, AT-65.
l Shift solenoid valve B, AT-68.
l Overrun clutch solenoid valve, AT-71.
l Torque converter clutch solenoid valve, AT-71.
l A/T fluid temperature sensor and TCM power source, AT-78.
l Engine speed signal, AT-82.
l Line pressure solenoid valve, AT-86.
l Park/neutral position, overdrive control, A/T check and throttle
(accelerator) position switches, AT-93.
l Battery
l Others
5. lFor self-diagnosis NG items, inspect each component. Repair or replace the
damaged parts. AT-14
6. lPerform all ROAD TEST and re-mark required procedures. AT-32
7. lPerform the Diagnostic Procedures for all remaining items marked NG. Repair or
replace the damaged parts.
Refer to the Symptom Chart when you perform the procedures. (The chart also
shows some other possible symptoms and the component inspection orders.) AT-46
AT-43
8. lErase self-diagnosis code from TCM memories. AT-19
TROUBLE DIAGNOSIS Ð Introduction
Diagnostic Worksheet (Cont'd)
AT-25
http://vnx.su/
A/T Fluid Check
FLUID LEAKAGE CHECK
1. Clean area suspected of leaking. Ð for example, mating sur-face of converter housing and transmission case.
2. Start engine, apply foot brake, place selector lever in ªDº posi- tion and wait a few minutes.
3. Stop engine.
4. Check for fresh leakage.
FLUID CONDITION CHECK
Fluid color Suspected cause
Dark or black with burned odor Wear of frictional material
Milky pink Water contamination Ð Road water enter-
ing through filler tube or breather
Varnished fluid, light to dark
brown and tacky Oxidation Ð Over or under filling, Ð Over-
heating
FLUID LEVEL CHECK
Refer to MA section (ªChecking A/T Fluidº, ªCHASSIS AND BODY
MAINTENANCEº).
Stall Test
STALL TEST PROCEDURE
1. Check A/T and engine fluid levels. If necessary, add.
2. Drive vehicle for approx. 10 minutes or until engine oil and ATF
reach operating temperature.ATF operating temperature: 50 - 80ÉC (122 - 176ÉF)
3. Set parking brake and block wheels.
4. Install a tachometer where it can be seen by driver during test.
I It is good practice to put a mark on point of specified
engine rpm on indicator.
5. Start engine, apply foot brake, and place selector lever in ªDº position.
6. Accelerate to wide open throttle gradually while applying foot brake.
7. Quickly note the engine stall revolution and immediately release throttle.
I During test, never hold throttle wide open for more than 5
seconds.
Stall revolution: 2,450 - 2,700 rpm
SAT801A
SAT638A
SAT647B
SAT513G
SAT514G
TROUBLE DIAGNOSIS Ð Basic Inspection
AT-27
http://vnx.su/
8. Move selector lever to ªNº position.
9. Cool off ATF.
IRun engine at idle for at least one minute.
10. Repeat steps 5 through 9 with selector lever in ª2º, ª1º and ªRº positions.
JUDGEMENT OF STALL TEST
The test result and possible damaged components relating to each result are shown in the illustration.
In order to pinpoint the possible damaged components, follow the WORK FLOW as shown in AT-26.
Note
Stall revolution is too high in ªDº or ª2º position:
I Slippage occurs in 1st gear but not in 2nd and 3rd gears. ..... Low one-way clutch slippage
I Slippage occurs at the following gears:
1st through 3rd gears in ªDº position and engine brake functions.
1st and 2nd gears in ª2º position and engine brake functions with accelerator pedal released (fully closed
throttle). ..... Forward clutch or forward one-way clutch slippage
Stall revolution is too high in ªRº position:
I Engine brake does not function in ª1º position. ..... Low & reverse brake slippage
I Engine brake functions in ª1º position. ..... Reverse clutch slippage
Stall revolution within specifications:
I Vehicle does not achieve speed of more than 80 km/h (50 MPH). ..... One-way clutch seizure in torque
converter housing
CAUTION:
Be careful since automatic fluid temperature increases abnormally.
I Slippage occurs in 3rd and 4th gears in ªDº position. ..... High clutch slippage
I Slippage occurs in 2nd and 4th gears in ªDº position. ..... Brake band slippage
Stall revolution less than specifications:
I Poor acceleration during starts. ..... One-way clutch seizure in torque converter
SAT771B
TROUBLE DIAGNOSIS Ð Basic Inspection
Stall Test (Cont'd)
AT-28
http://vnx.su/
4. Set parking brake and block wheels.
IContinue to depress brake pedal fully while line pressure
test is being performed at stall speed.
5. Start engine and measure line pressure at idle and stall speed.
I When measuring line pressure at stall speed, follow the
stall test procedure.
Line pressure: Refer to SDS, AT-201.
JUDGEMENT OF LINE PRESSURE TEST
Judgement Suspected parts
At idle Line pressure is low in all
positions.
I
Oil pump wear
I Control piston damage
I Pressure regulator valve or plug sticking
I Spring for pressure regulator valve damaged
I A/T fluid pressure leakage between oil strainer and pressure regulator valve
I Clogged strainer
Line pressure is low in par-
ticular position. I
Fluid pressure leakage between manual valve and particular clutch
I For example, line pressure is:
Ð Low in ªRº and ª1º positions,
Ð Normal in ªDº and ª2º positions.
Then, fluid leakage exists at or around low and reverse brake circuit.
Refer to ªCLUTCH AND BAND CHARTº, AT-11.
Line pressure is high. IMal-adjustment of throttle position sensor
I A/T fluid temperature sensor damaged
I Line pressure solenoid valve sticking
I Short circuit of line pressure solenoid valve circuit
I Pressure modifier valve sticking
I Pressure regulator valve or plug sticking
I Open in dropping resistor circuit
At stall speed Line pressure is low.
IMal-adjustment of throttle position sensor
I Line pressure solenoid valve sticking
I Short circuit of line pressure solenoid valve circuit
I Pressure regulator valve or plug sticking
I Pressure modifier valve sticking
I Pilot valve sticking
SAT513G
SAT493G
TROUBLE DIAGNOSIS Ð Basic Inspection
Line Pressure Test (Cont'd)
AT-31
http://vnx.su/
Symptom Chart
FON vehicleEFOFF vehicleE
Reference page (AT- )27,
120 11 9 56,
62,
82 30
65,
144 68,
86 71,
74 78,
11 8 11 8 11 8 71,
128 156,
160 162162,
170 166,
176 180
Numbers are arranged in order of probability.
Perform inspections starting with number one and
work up. Circled numbers indicate that the transmis-
sion must be removed from the vehicle.
Fluid level
Control linkage
Park/neutral position 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
Engine does not start in ªNº, ªPº positions. . 2 3................1. ......... .
Engine starts in position other than ªNº and ªPº. . 1 2 ................. . ......... .
Transmission noise in ªPº and ªNº positions. 1 . . 3 4 5 . 2 ............q
7q6........ .
Vehicle moves when changing into ªPº position or
parking gear does not disengage when shifted out
of ªPº position. . 1.................. .
.........q
2
Vehicle runs in ªNº position.
. 1................2. .. q4.q3.q5... .
Vehicle will not run in ªRº position (but runs in ªDº,
ª2º and ª1º positions). Clutch slips.
Very poor acceleration. . 1.....24..3........ ..
q
5q6q7.q8.q9..
Vehicle braked when shifting into ªRº position. 1 2 .....35..4........ ... q
6q8.q9.. q7.
Sharp shock in shifting from ªNº to ªDº position. . . . 2 . 5137 . . 6 . . 48.... ....q
10..... .
Vehicle will not run in ªDº and ª2º positions (but runs
in ª1º and ªRº position). . 1.................. .
......q
2.. .
Vehicle will not run in ªDº, ª1º and ª2º positions (but
runs in ªRº position). Clutch slips.
Very poor acceleration. 1 ......24..3...5.... ..
q
6q7q8q9.q10.. .
Clutches or brakes slip somewhat in starting. 1 2 . 3 . . . 4 6 . . 5 . . . 7 . . 8 . q
13q12q10.q9... q11..
Excessive creep. . .....1............. . ......... .
No creep at all. 1 ......23........... q
6q5..q4..... .
Failure to change gear from ªD
1ºtoªD2º. . 21.5...43.......... . ........q6.
Failure to change gear from ªD
2ºtoªD3º. . 21.5...4.3......... ... q6.....q7.
Failure to change gear from ªD
3ºtoªD4º. . 21.4....3....5..... . ........q6.
Too high a gear change point from ªD
1ºtoªD2º, from
ªD2ºtoªD3º, from ªD3ºtoªD4º. . ..12....34......... .
......... .
Gear change directly from ªD
1ºtoªD3º occurs. 1 ...............2... . ........q3.
Engine stops when shifting lever into ªRº, ªDº, ª2º
and ª1º. . .....1.3...2.......
q
4......... .
Too sharp a shock in change from ªD
1ºtoªD2º. . ..1...24.....5.3... . ........q6.
Too sharp a shock in change from ªD
2ºtoªD3º. . ..1...24........3.. ... q5.....q6.
TROUBLE DIAGNOSIS Ð General Description
AT-43
http://vnx.su/
FON vehicleEFOFF vehicleE
Reference page (AT- )27,
120 11 9 56,
62,
82 30
65,
144 68,
86 71,
74 78,
11 8 11 8 11 8 71,
128 156,
160 162162,
170 166,
176 180
Numbers are arranged in order of probability.
Perform inspections starting with number one and
work up. Circled numbers indicate that the transmis-
sion must be removed from the vehicle.
Fluid level
Control linkage
Park/neutral position 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
Too sharp a shock in change from
ªD3ºtoªD4º. . ..1...24.........3. .
.....q6..q5.
Almost no shock or clutches slipping in change from
ªD
1ºtoªD2º. 1 ..2...35.......4... .
........q6.
Almost no shock or slipping in change from ªD
2ºto
ªD3º. 1 ..2...35........4.. ...
q6.....q7.
Almost no shock or slipping in change from ªD
3ºto
ªD4º. 1 ..2...35.........4. ...
q6.....q7.
Vehicle braked by gear change from ªD
1ºtoªD2º. 1 ................... .. q2q4...q5q3..
Vehicle braked by gear change from ªD
2ºtoªD3º. 1 ................... . ........q2.
Vehicle braked by gear change from ªD
3ºtoªD4º. 1 ................... .. q4..q3q2... .
Maximum speed not attained. Acceleration poor. 1 . 2 .....534.........q
11q10q6q7....q9q8.
Failure to change gear from ªD
4ºtoªD3º. 1 ..2....64.5.3...... . .....q8.q7..
Failure to change gear from ªD
3ºtoªD2º or from
ªD4ºtoªD2º. 1 ..2....534......... ...
q6.....q7.
Failure to change gear from ªD
2ºtoªD1º or from
ªD3ºtoªD1º. 1 ..2....534......... ...
q7...q6.q8.
Gear change shock felt during deceleration by
releasing accelerator pedal. . ..1...24....3...... .
......... .
Too high a change point from ªD
4ºtoªD3º, from ªD3º
to ªD2º, from ªD2ºtoªD1º. . ..12............... .
......... .
Kickdown does not operate when depressing pedal
in ªD
4º within kickdown vehicle speed. . ..12....34......... .
......... .
Kickdown operates or engine overruns when
depressing pedal in ªD
4º beyond kickdown vehicle
speed limit. . ..21....34......... .
......... .
Races extremely fast or slips in changing from ªD
4º
to ªD3º when depressing pedal. 1 ..2...35..4........ ...
q6q7..... .
Races extremely fast or slips in changing from ªD
4º
to ªD2º when depressing pedal. 1 ..2...365.4........ ....
q8....q7.
Races extremely fast or slips in changing from ªD
3º
to ªD2º when depressing pedal. 1 ..2...35..4..6..7.. ...
q10q9....q8.
Races extremely fast or slips in changing from ªD
4º
or ªD3ºtoªD1º when depressing pedal. 1 ..2...35..4........ ....
q6q7.q8.. .
Vehicle will not run in any position. 1 2 .....3...4........ q
9q5.q6.... q8q7q10
Transmission noise in ªDº, ª2º, ª1º and ªRº positions. 1
................... q2......... .
TROUBLE DIAGNOSIS Ð General Description
Symptom Chart (Cont'd)
AT-44
http://vnx.su/
FON vehicleEFOFF vehicleE
Reference page (AT- )27,
120 11 9 56,
62,
82 30
65,
144 68,
86 71,
74 78,
11 8 11 8 11 8 144,
128 156,
160 162162,
170 166,
176 180
Numbers are arranged in order of probability.
Perform inspections starting with number one and
work up. Circled numbers indicate that the transmis-
sion must be removed from the vehicle.
Fluid level
Control linkage
Park/neutral position 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
Failure to change from ªD3º to ª2º when changing
lever into ª2º position. . 712....654..3...... .
.....q9..q8.
Gear change from ª2
1ºtoª22º in ª2º position. . . 1 ................. . ......... .
Engine brake does not operate in ª1º position. . 2134 . . . 65 . . . 7...... ......q
8.q9..
Gear change from ª1
1ºtoª12º in ª1º position. . 2 1 ................. . ......... .
Does not change from ª1
2ºtoª11º in ª1º position. . . 1 . 2 . . . 4 3 . . . 5 ...... ......q6.q7..
Large shock changing from ª1
2ºtoª11º in ª1º posi-
tion. . .......1........... .
.......q2..
Transmission overheats. 1 . . 3 . . 2 4 6 . . 5 ........q
14q7q8q9q11.q12.q13q10.
ATF shoots out during operation.
White smoke emitted from exhaust pipe during
operation. 1 ................... ..
q
2q3q5.q6.q7q4.
Offensive smell at fluid charging pipe. 1 ................... q
2q3q4q5q7.q8.q9q6.
Torque converter is not locked up. . . 3124 . 68 . . . 7 . 5.....q
9......... .
Torque converter clutch piston slip 1 . . 2 . . . 3 6 . . 5 4 .......q
7......... .
Lock-up point is extremely high or low. . . . 1 2 . . . 4 . . . 3 ....... .......... .
A/T does not shift to ªD
4º when driving with over-
drive control switch ªONº. . .213..864...57..... .
.....q10..q9.
Engine is stopped at ªRº, ªDº, ª2º and ª1º positions. 1 .......543.2....... . ......... .
TROUBLE DIAGNOSIS Ð General Description
Symptom Chart (Cont'd)
AT-45
http://vnx.su/