Page 1249 of 2493
3 JUDGEMENT PROCEDURE STEP 2
1. Move selector lever to ª2º position.
2. Set overdrive control switch to ªONº position.
SAT780B
©GO TO 4.
4 JUDGEMENT PROCEDURE STEP 3
1. Move selector lever to ª1º position.
2. Set overdrive control switch to ªOFFº position.
SAT781B
©GO TO 5.
5 JUDGEMENT PROCEDURE STEP 4
1. Depress accelerator pedal fully and release it.
SAT981F
©GO TO 6.
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTIONEURO-OBD
Diagnostic Procedure Without CONSULT-II (Cont'd)
AT-63
Page 1250 of 2493
6 CHECK SELF-DIAGNOSIS CODE
Check O/D OFF indicator lamp. Refer to JUDGEMENT OF SELF-DIAGNOSIS CODE, AT-64.
NAT352
©DIAGNOSIS END
JUDGEMENT OF SELF-DIAGNOSIS CODENJAT0352S02
O/D OFF indicator lamp:
All judgement flickers are the same.
SAT436F
All circuits that can be confirmed by self-diagnosis are OK.1st judgement flicker is longer than others.
SAT437F
Revolution sensor circuit is short-circuited or disconnected.
ÞGo to VEHICLE SPEED SENSOR´A/T (REVOLUTION SEN-
SOR).
EURO-OBD: AT-193
2nd judgement flicker is longer than others.
SAT439F
Vehicle speed sensor circuit is short-circuited or disconnected.
ÞGo to VEHICLE SPEED SENSOR´MTR.
EURO-OBD: AT-2783rd judgement flicker is longer than others.SAT441F
Throttle position sensor circuit is short-circuited or disconnected.
ÞGo to THROTTLE POSITION SENSOR.
EURO-OBD: AT-256
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTIONEURO-OBD
Diagnostic Procedure Without CONSULT-II (Cont'd)
AT-64
Page 1251 of 2493

O/D OFF indicator lamp:
4th judgement flicker is longer than others.
SAT443F
Shift solenoid valve A circuit is short-circuited or disconnected.
ÞGo to SHIFT SOLENOID VALVE A.
EURO-OBD: AT-2445th judgement flicker is longer than others.
SAT445F
Shift solenoid valve B circuit is short-circuited or disconnected.
ÞGo to SHIFT SOLENOID VALVE B.
EURO-OBD: AT-250
6th judgement flicker is longer than others.
SAT447F
Overrun clutch solenoid valve circuit is short-circuited or discon-
nected.
ÞGo to OVERRUN CLUTCH SOLENOID VALVE.
EURO-OBD: AT-2657th judgement flicker is longer than others.
SAT449F
Torque converter clutch solenoid valve circuit is short-circuited
or disconnected.
ÞGo to TORQUE CONVERTER CLUTCH SOLENOID
VA LV E .
EURO-OBD: AT-231
8th judgement flicker is longer than others.
SAT451F
A/T fluid temperature sensor is disconnected or TCM power
source circuit is damaged.
ÞGo to A/T FLUID TEMPERATURE SENSOR AND TCM
POWER SOURCE.
EURO-OBD: AT-2719th judgement flicker is longer than others.
SAT453F
Engine speed signal circuit is short-circuited or disconnected.
ÞGo to ENGINE SPEED SIGNAL.
EURO-OBD: AT-198
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTIONEURO-OBD
Diagnostic Procedure Without CONSULT-II (Cont'd)
AT-65
Page 1252 of 2493
O/D OFF indicator lamp:
10th judgement flicker is longer than others.
SAT455F
Line pressure solenoid valve circuit is short-circuited or discon-
nected.
ÞGo to LINE PRESSURE SOLENOID VALVE.
EURO-OBD: AT-237Flickers as shown below.
SAT457F
Battery power is low.
Battery has been disconnected for a long time.
Battery is connected conversely.
(When reconnecting TCM connectors. Ð This is not a problem.)
Lamp comes on.
SAT367J
PNP switch, overdrive control switch or throttle position switch
circuit is disconnected or TCM is damaged.
ÞGo to 21. TCM Self-diagnosis Does Not Activate (PNP,
OVERDRIVE CONTROL AND THROTTLE POSITION
SWITCHES).
EURO-OBD: AT-326
t
1= 2.5 seconds t2= 2.0 seconds t3= 1.0 second t4= 1.0 second
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTIONEURO-OBD
Diagnostic Procedure Without CONSULT-II (Cont'd)
AT-66
Page 1253 of 2493

SAT631IA
SAT632I
SEF234G
IntroductionNJAT0023The TCM receives a signal from the vehicle speed sensor, throttle
position sensor or PNP switch and provides shift control or lock-up
control via A/T solenoid valves.
Input and output signals must always be correct and stable in the
operation of the A/T system. The A/T system must be in good
operating condition and be free of valve seizure, solenoid valve
malfunction, etc.
It is much more difficult to diagnose a problem that occurs intermit-
tently rather than continuously. Most intermittent problems are
caused by poor electric connections or improper wiring. In this
case, careful checking of suspected circuits may help prevent the
replacement of good parts.
A visual check only, may not find the cause of the problems. A road
test with CONSULT-II or a circuit tester connected should be per-
formed. Follow the ªWork Flowº. Refer to AT-71.
Before undertaking actual checks, take a few minutes to talk with
a customer who approaches with a driveability complaint. The cus-
tomer can supply good information about such problems, espe-
cially intermittent ones. Find out what symptoms are present and
under what conditions they occur. A ªDiagnostic Worksheetº like the
example (AT-68) should be used.
Start your diagnosis by looking for ªconventionalº problems first.
This will help troubleshoot driveability problems on an electronically
controlled engine vehicle.
Also check related Service bulletins for information.
TROUBLE DIAGNOSIS Ð
INTRODUCTION
EXCEPT FOR EURO-OBD
AT-67
Page 1254 of 2493
DIAGNOSTIC WORKSHEET=NJAT0023S01Information from CustomerNJAT0023S0101KEY POINTS
WHAT..... Vehicle & A/T model
WHEN..... Date, Frequencies
WHERE..... Road conditions
HOW..... Operating conditions, Symptoms
Customer name MR/MS Model & Year VIN
Trans. model Engine Mileage
Incident Date Manuf. Date In Service Date
FrequencyNContinuousNIntermittent ( times a day)
SymptomsNVehicle does not move. (NAny positionNParticular position)
NNo up-shift (N1st®2ndN2nd®3rdN3rd®O/D)
NNo down-shift (NO/D®3rdN3rd®2ndN2nd®1st)
NLockup malfunction
NShift point too high or too low.
NShift shock or slip (NN®DNLockupNAny drive position)
NNoise or vibration
NNo kickdown
NNo pattern select
NOthers
()
O/D OFF indicator lamp Blinks for about 8 seconds.
NContinuously litNNot lit
Malfunction indicator (MI)NContinuously litNNot lit
TROUBLE DIAGNOSIS Ð
INTRODUCTION
EXCEPT FOR EURO-OBD
Introduction (Cont'd)
AT-68
Page 1255 of 2493

Diagnostic Worksheet=NJAT0023S0102
1.NRead the Fail-safe and listen to customer complaints. AT-9
2.NCHECK A/T FLUIDAT-78
NLeakage (Follow specified procedure)
NFluid condition
NFluid level
3.NPerform STALL TEST and LINE PRESSURE TEST. AT-78, 82
NStall test Ð Mark possible damaged components/others.
NTorque converter one-way clutch
NReverse clutch
NForward clutch
NOverrun clutch
NForward one-way clutchNLow & reverse brake
NLow one-way clutch
NEngine
NLine pressure is low
NClutches and brakes except high clutch
and brake band are OK
NLine Pressure test Ð Suspected parts:
4.NPerform all ROAD TEST and mark required procedures. AT-83
4-1. Check before engine is started. AT-85
NSELF-DIAGNOSTIC PROCEDURE Ð Mark detected items.
NVehicle speed sensor´A/T (Revolution sensor), AT-124.
NVehicle speed sensor´MTR, AT-129.
NThrottle position sensor, AT-132.
NShift solenoid valve A, AT-140.
NShift solenoid valve B, AT-146.
NOverrun clutch solenoid valve, AT-152.
NTorque converter clutch solenoid valve, AT-157.
NA/T fluid temperature sensor and TCM power source, AT-163.
NEngine speed signal, AT-170.
NLine pressure solenoid valve, AT-174.
NControl unit (RAM), control unit (ROM), AT-282.
NControl unit (EEP ROM), AT-284.
NPNP, overdrive control and throttle position switches, AT-326.
NBattery
NOthers
4-2. Check at idleAT-87
N1. O/D OFF Indicator Lamp Does Not Come On, AT-288.
N2. Engine Cannot Be Started In ªPº And ªNº Position, AT-291.
N3. In ªPº Position, Vehicle Moves Forward Or Backward When Pushed, AT-292.
N4. In ªNº Position, Vehicle Moves, AT-293.
N5. Large Shock. ªNº®ªRº Position, AT-295.
N6. Vehicle Does Not Creep Backward In ªRº Position, AT-297.
N7. Vehicle Does Not Creep Forward In ªDº, ª2º Or ª1º Position, AT-300.
TROUBLE DIAGNOSIS Ð
INTRODUCTION
EXCEPT FOR EURO-OBD
Introduction (Cont'd)
AT-69
Page 1256 of 2493

4. 4-3. Cruise testAT-90
AT-93
Part-1
N8. Vehicle Cannot Be Started From D
1, AT-303.
N9. A/T Does Not Shift: D
1®D2Or Does Not Kickdown: D4®D2, AT-306.
N10. A/T Does Not Shift: D
2®D3, AT-309.
N11. A/T Does Not Shift: D
3®D4, AT-312.
N12. A/T Does Not Perform Lock-up, AT-315.
N13. A/T Does Not Hold Lock-up Condition, AT-317.
N14. Lock-up Is Not Released, AT-319.
N15. Engine Speed Does Not Return To Idle (Light Braking D
4®D3), AT-320.
Part-2AT-97
N16. Vehicle Does Not Start From D
1, AT-322.
N9. A/T Does Not Shift: D
1®D2Or Does Not Kickdown: D4®D2, AT-306.
N10. A/T Does Not Shift: D
2®D3, AT-309.
N11. A/T Does Not Shift: D
3®D4, AT-312.
Part-3AT-99
N17. A/T Does Not Shift: D
4®D3When Overdrive Control Switch ªONº®ªOFFº, AT-323
N15. Engine Speed Does Not Return To Idle (Engine Brake In D
3), AT-320.
N18. A/T Does Not Shift: D
3®22, When Selector Lever ªDº®ª2º Position, AT-324.
N15. Engine Speed Does Not Return To Idle (Engine Brake In 2
2), AT-320.
N19. A/T Does Not Shift: 2
2®11, When Selector Lever ª2º®ª1º Position, AT-325.
N20. Vehicle Does Not Decelerate By Engine Brake, AT-326.
N21. TCM Self-diagnosis Does Not Activate (PNP, Overdrive Control and Throttle Position Switches
Circuit Checks), AT-326.
NSELF-DIAGNOSTIC PROCEDURE Ð Mark detected items.
NVehicle speed sensor´A/T (Revolution sensor), AT-124.
NVehicle speed sensor´MTR, AT-129.
NThrottle position sensor, AT-132.
NShift solenoid valve A, AT-140.
NShift solenoid valve B, AT-146.
NOverrun clutch solenoid valve, AT-152.
NTorque converter clutch solenoid valve, AT-157.
NA/T fluid temperature sensor and TCM power source, AT-163.
NEngine speed signal, AT-170.
NLine pressure solenoid valve, AT-174.
NControl unit (RAM), control unit (ROM), AT-282.
NControl unit (EEP ROM), AT-284.
NPNP, overdrive control and throttle position switches, AT-326.
NBattery
NOthers
5.NFor self-diagnosis NG items, inspect each component. Repair or replace the damaged parts. AT-38
6.NPerform all ROAD TEST and re-mark required procedures. AT-83
7.NPerform 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-116
AT-103
8.NErase self-diagnosis code from TCM memories. AT-41
AT-47
TROUBLE DIAGNOSIS Ð
INTRODUCTION
EXCEPT FOR EURO-OBD
Introduction (Cont'd)
AT-70