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DTC work support item Description Check items (Possible cause)
4TH GR FNCTN P0734Following items for ªA/T 4th gear function (P0734)º can be con-
firmed.
+Self-diagnosis status (whether the diagnosis is being con-
ducted or not)
+Self-diagnosis result (OK or NG)+Shift solenoid valve A
+Shift solenoid valve B
+Overrun clutch solenoid valve
+Line pressure solenoid valve
+Each clutch
+Hydraulic control circuit
Diagnostic Procedure Without CONSULT-IINJAT0352EURO-OBD SELF-DIAGNOSTIC PROCEDURE (WITH
GST)
NJAT0352S04Refer to EC-94, section ªGeneric Scan Tool (GST)º.
EURO-OBD SELF-DIAGNOSTIC PROCEDURE (NO
TOOLS)
NJAT0352S05Refer to EC-74, ªMalfunction Indicator (MI)º.
SAT491J
SAT851JA
TCM SELF-DIAGNOSTIC PROCEDURE (NO TOOLS)NJAT0352S06PreparationNJAT0352S06011. Turn ignition switch to ªOFFº position.
2. Connect the handy type vacuum pump to the throttle opener
and apply vacuum þ25.3 kPa (þ253 mbar, þ190 mmHg, þ7.48
inHg). (If throttle opener is equipped)
3. Disconnect the throttle position switch harness connector.
4. Turn ignition switch to ªONº position.
5. Check continuity of the closed throttle position switch.
Continuity should exist.
(If continuity does not exist, check throttle opener and
closed throttle position switch. Then increase vacuum
until closed throttle position switch shows continuity.)
6. Go to ªSelf-diagnostic procedure (Without CONSULT-II)º.
ON BOARD DIAGNOSTIC SYSTEM
DESCRIPTION
EURO-OBD
CONSULT-II (Cont'd)
AT-63
Page 66 of 2898
1 CHECK O/D OFF INDICATOR LAMP
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch to ªOFFº position.
Wait 5 seconds.
3. Turn ignition switch to ªACCº position.
SAT774B
4. Set overdrive control switch to ªONº position.
5. Move selector lever to ªPº position.
6. Turn ignition switch to ªONº position. (Do not start engine.)
7. Does O/D OFF indicator lamp come on for about 2 seconds?
SAT138K
YesorNo
Ye s©GO TO 2.
No©Go to ª1. O/D OFF Indicator Lamp Does Not Come Onº, AT-296.
2 JUDGEMENT PROCEDURE STEP 1
1. Turn ignition switch to ªOFFº position.
2. Turn ignition switch to ªACCº position.
3. Move selector lever to ªDº position.
4. Set overdrive control switch to ªOFFº position.
5. Turn ignition switch to ªONº position. (Do not start engine.)
+Wait more than 2 seconds after turning ignition switch ªONº.
SAT653E
©GO TO 3.
ON BOARD DIAGNOSTIC SYSTEM
DESCRIPTION
EURO-OBD
Diagnostic Procedure Without CONSULT-II (Cont'd)
AT-64
Page 67 of 2898
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
DESCRIPTION
EURO-OBD
Diagnostic Procedure Without CONSULT-II (Cont'd)
AT-65
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6 CHECK SELF-DIAGNOSIS CODE
Check O/D OFF indicator lamp. Refer to JUDGEMENT OF SELF-DIAGNOSIS CODE, AT-66.
SAT138K
©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-195
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-2813rd judgement flicker is longer than others.SAT441F
Throttle position sensor circuit is short-circuited or disconnected.
ÞGo to THROTTLE POSITION SENSOR.
EURO-OBD: AT-258
ON BOARD DIAGNOSTIC SYSTEM
DESCRIPTION
EURO-OBD
Diagnostic Procedure Without CONSULT-II (Cont'd)
AT-66
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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-2465th 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-252
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-2687th 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-233
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-2749th judgement flicker is longer than others.
SAT453F
Engine speed signal circuit is short-circuited or disconnected.
ÞGo to ENGINE SPEED SIGNAL.
EURO-OBD: AT-200
ON BOARD DIAGNOSTIC SYSTEM
DESCRIPTION
EURO-OBD
Diagnostic Procedure Without CONSULT-II (Cont'd)
AT-67
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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-239Flickers 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-334
t
1= 2.5 seconds t2= 2.0 seconds t3= 1.0 second t4= 1.0 second
ON BOARD DIAGNOSTIC SYSTEM
DESCRIPTION
EURO-OBD
Diagnostic Procedure Without CONSULT-II (Cont'd)
AT-68
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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-73.
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-70) 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-69
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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-70