Page 1409 of 2493

SAT014K
SAT971J
SAT021J
DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION
PROCEDURE
NJAT0291S04CAUTION:
+Always drive vehicle at a safe speed.
+If conducting this ªDTC CONFIRMATION PROCEDUREº
again, always turn ignition switch ªOFFº and wait at least
5 seconds before continuing.
+Be careful not to rev engine into the red zone on the
tachometer.
NOTE:
If ªDIAGNOSTIC TROUBLE CODE CONFIRMATION PROCE-
DUREº has been previously conducted, always turn ignition
switch ªOFFº and wait at least 5 seconds before conducting
the next test.
TESTING CONDITION:
Always drive vehicle on a level road to improve the accuracy
of test.
After the repair, perform the following procedure to confirm the
malfunction is eliminated.
With CONSULT-II
1) Start engine and select ªDATA MONITORº mode for ªA/Tº with
CONSULT-II.
2) Make sure that output voltage of A/T fluid temperature sensor
is within the range below.
FLUID TEMP SEN: 0.4 - 1.5V
If out of range, drive the vehicle to decrease the voltage (warm
up the fluid) or stop engine to increase the voltage (cool down
the fluid).
3) Select ª4TH GR FNCTN P0734º of ªDTC WORK SUPPORTº
mode for ªA/Tº with CONSULT-II and touch ªSTARTº.
4) Accelerate vehicle to 45 to 55 km/h (28 to 34 MPH) under the
following condition and release the accelerator pedal com-
pletely.
THROTTLE POSI: Less than 5.5/8 (at all times during step
4)
Selector lever: D position (OD ªONº)
+Check that ªGEARº shows ª3º after releasing pedal.
5) Depress accelerator pedal steadily with 1.0/8 - 2.0/8 of
ªTHROTTLE POSIº from a speed of 45 to 55 km/h (28 to 34
MPH) until ªTESTINGº has turned to ªSTOP VEHICLEº or
ªCOMPLETEDº. (It will take approximately 3 seconds.)
If the check result NG appears on CONSULT-II screen, go to
ªDIAGNOSTIC PROCEDUREº, AT-226.
If ªSTOP VEHICLEº appears on CONSULT-II screen, go to
following step.
+Check that ªGEARº shows ª4º when depressing accelera-
tor pedal with 1.0/8 - 2.0/8 of ªTHROTTLE POSIº.
+If ªTESTINGº does not appear on CONSULT-II for a long
time, select ªSELF-DIAGNOSISº for ªENGINEº. In case a
1st trip DTC other than P0734 is shown, refer to applicable
ªTROUBLE DIAGNOSIS FOR DTCº.
6) Stop vehicle.
7) Follow the instruction displayed. (Check for normal shifting
referring to the table below.)
DTC P0734 A/T 4TH GEAR FUNCTIONEURO-OBD
Description (Cont'd)
AT-223
Page 1410 of 2493
Vehicle conditionGear on actual transmission shift pattern when
screen is changed to 1®2®3®4
No malfunction exists 1®2®3®4
Malfunction for P0734 exists. 1®2®2®1
8) Make sure that ªOKº is displayed. (If ªNGº is displayed, refer
to ªDIAGNOSTIC PROCEDUREº.)
Refer to ªDIAGNOSTIC PROCEDUREº, AT-226.
Refer to shift schedule, AT-449.
With GST
Follow the procedure ªWith CONSULT-IIº.
DTC P0734 A/T 4TH GEAR FUNCTIONEURO-OBD
Description (Cont'd)
AT-224
Page 1411 of 2493
Wiring Diagram Ð AT Ð 4THNJAT0292
YAT238
DTC P0734 A/T 4TH GEAR FUNCTIONEURO-OBD
Wiring Diagram Ð AT Ð 4TH
AT-225
Page 1412 of 2493
Diagnostic ProcedureNJAT0293
1 CHECK SHIFT UP (D3TO D4)
During ªCruise test Ð Part 1º (AT-93), does A/T shift from D3to D4at the specified speed?
SAT988H
YesorNo
Ye s©GO TO 9.
No©GO TO 2.
2 CHECK LINE PRESSURE
Perform line pressure test.
Refer to AT-82.
MTBL0507
OK or NG
OK©GO TO 3.
NG©GO TO 6.
DTC P0734 A/T 4TH GEAR FUNCTIONEURO-OBD
Diagnostic Procedure
AT-226
Page 1413 of 2493
3 CHECK SOLENOID VALVES
1. Remove control valve assembly.
Refer to AT-343.
2. Refer to ªComponent Inspectionº, AT-230.
SAT847JB
OK or NG
OK©GO TO 4.
NG©Replace solenoid valve assembly.
4 CHECK CONTROL VALVE
1. Disassemble control valve assembly.
Refer to AT-375.
2. Check to ensure that:
+Valve, sleeve and plug slide along valve bore under their own weight.
+Valve, sleeve and plug are free from burrs, dents and scratches.
+Control valve springs are free from damage, deformation and fatigue.
+Hydraulic line is free from obstacles.
SAT367H
OK or NG
OK©GO TO 5.
NG©Repair control valve.
DTC P0734 A/T 4TH GEAR FUNCTIONEURO-OBD
Diagnostic Procedure (Cont'd)
AT-227
Page 1414 of 2493
5 CHECK SHIFT UP (D3TO D4)
Does A/T shift from D3to D4at the specified speed?
OK or NG
OK©GO TO 9.
NG©Check control valve again. Repair or replace control valve assembly.
6 CHECK LINE PRESSURE SOLENOID VALVE
1. Remove control valve assembly.
Refer to AT-343.
2. Refer to ªComponent Inspectionº, AT-230.
SAT888JA
OK or NG
OK©GO TO 7.
NG©Replace solenoid valve assembly.
DTC P0734 A/T 4TH GEAR FUNCTIONEURO-OBD
Diagnostic Procedure (Cont'd)
AT-228
Page 1415 of 2493
7 CHECK CONTROL VALVE
1. Disassemble control valve assembly.
Refer to AT-375.
2. Check line pressure circuit valves for sticking.
+Pressure regulator valve
+Pilot valve
+Pressure modifier valve
SAT367H
OK or NG
OK©GO TO 8.
NG©Repair control valve.
8 CHECK SHIFT UP (D3TO D4)
Does A/T shift from D3to D4at the specified speed?
YesorNo
Ye s©GO TO 9.
No©Check control valve again. Repair or replace control valve assembly.
9 CHECK DTC
Perform Diagnostic Trouble Code (DTC) confirmation procedure, AT-223.
OK or NG
OK©INSPECTION END
NG©Perform ªCruise test Ð Part 1º again and return to the start point of this test group.
DTC P0734 A/T 4TH GEAR FUNCTIONEURO-OBD
Diagnostic Procedure (Cont'd)
AT-229
Page 1416 of 2493
SAT848JB
Component Inspection=NJAT0294SOLENOID VALVESNJAT0294S01+For removal, refer to AT-343.
Resistance CheckNJAT0294S0101+Check resistance between two terminals.
Solenoid valve Terminal No.Resistance
(Approx.)
Shift solenoid
valve A2
Ground20-30W
Shift solenoid
valve B1 5-20W
Line pressure
solenoid valve4 2.5-5W
SAT847JB
Operation CheckNJAT0294S0102+Check solenoid valve by listening for its operating sound while
applying battery voltage to the terminal and ground.
DTC P0734 A/T 4TH GEAR FUNCTIONEURO-OBD
Component Inspection
AT-230