2001 INFINITI QX4 Factory Service Manual

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Page 145 of 2395

INFINITI QX4 2001 Factory Service Manual SAT014K
SAT971J
SAT021J
DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION
PROCEDURE
NBAT0048S01CAUTION:
IAlways drive vehicle at a safe speed.
IBe careful not to rev engine into the red zone on the
tachomete

SAT014K
SAT971J
SAT021J
DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION
PROCEDURE
NBAT0048S01CAUTION:
IAlways drive vehicle at a safe speed.
IBe 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 CONDITIONS:
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 55 to 65 km/h (34 to 40 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)
ICheck 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 55 to 65 km/h (34 to 40
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-143.
If ªSTOP VEHICLEº appears on CONSULT-II screen, go to
following step.
ICheck that ªGEARº shows ª4º when depressing accelera-
tor pedal with 1.0/8 - 2.0/8 of ªTHROTTLE POSIº.
IIf ªTESTINGº does not appear on CONSULT-II for a long
time, select ªSELF-DIAG RESULTSº for ªENGINEº. In case
a 1st trip DTC other than P0734 is shown, refer to appli-
cable ªTROUBLE DIAGNOSIS FOR DTCº.
6) Stop vehicle.
7) Follow the instruction displayed. (Check for normal shifting
referring to the table below.)
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
DTC P0734 IMPROPER SHIFTING TO 4TH GEAR POSITION
Description (Cont'd)
AT-140

Page 146 of 2395

INFINITI QX4 2001 Factory Service Manual 8) Make sure that ªOKº is displayed. (If ªNGº is displayed, refer
to ªDIAGNOSTIC PROCEDUREº.) Refer to ªDIAGNOSTIC
PROCEDUREº, AT-143.
Refer to shift schedule, AT-356.
With GST
Follow the proc

Page 147 of 2395

INFINITI QX4 2001 Factory Service Manual Wiring Diagram Ð AT Ð 4THNBAT0193
MAT912A
DTC P0734 IMPROPER SHIFTING TO 4TH GEAR POSITION
Wiring Diagram Ð AT Ð 4TH
AT-142

Page 148 of 2395

INFINITI QX4 2001 Factory Service Manual Diagnostic ProcedureNBAT0049
1 CHECK SHIFT UP (D3TO D4)
During ªCruise test þ Part 1º, AT-71.
Does A/T shift from D
3to D4at the specified speed?
SAT988H
YesorNo
Ye s©GO TO 9.
No©GO TO 2.
2 CHECK

Page 149 of 2395

INFINITI QX4 2001 Factory Service Manual 3 CHECK SOLENOID VALVES
1. Remove control valve assembly. Refer to AT-273.
2. Refer to ªComponent Inspectionº, AT-147.
SAT158J
OK or NG
OK©GO TO 4.
NG©Replace solenoid valve assembly.
4 CHECK CONT

Page 150 of 2395

INFINITI QX4 2001 Factory Service Manual 5 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.
6 CHECK LINE PRESSURE SOLE

Page 151 of 2395

INFINITI QX4 2001 Factory Service Manual 7 CHECK CONTROL VALVE
1. Disassemble control valve assembly. Refer to AT-301.
2. Check line pressure circuit valves for sticking.
IPressure regulator valve
IPilot valve
IPressure modifier valve
SAT367

Page 152 of 2395

INFINITI QX4 2001 Factory Service Manual SAT159J
Component InspectionNBAT0050SOLENOID VALVESNBAT0050S01IFor removal, refer to AT-273.
Resistance CheckNBAT0050S0101ICheck resistance between terminals (3, 2 or 6) and ground.
Solenoid valve Ter

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