Infiniti QX4 (R50). Manual — part 31
SAT014K
SAT971J
SAT021J
DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION
PROCEDURE
NBAT0039S01
CAUTION:
I
Always drive vehicle at a safe speed.
I
Be careful not to rev engine into the red zone on the
tachometer.
NOTE:
If “DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCE-
DURE” has been previously conducted, always turn ignition
switch “OFF” 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 “DATA MONITOR” mode for “A/T” 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 “1ST GR FNCTN P0731” of “DTC WORK SUPPORT”
mode for “A/T” with CONSULT-II and touch “START”.
4)
Accelerate vehicle to 10 to 20 km/h (6 to 12 MPH) under the
following condition and release the accelerator pedal com-
pletely.
THROTTLE POSI: Less than 1.0/8 (at all times during step
4)
Selector lever: D position (OD “ON”)
I
Check that “GEAR” shows “2” after releasing pedal.
5)
Depress accelerator pedal to WOT (more than 7.0/8 of
“THROTTLE POSI”) quickly from a speed of 10 to 20 km/h (6
to 12 MPH) until “TESTING” changes to “STOP VEHICLE” or
“COMPLETED”. (It will take approximately 3 seconds.)
If the check result NG appears on CONSULT-II screen, go to
“DIAGNOSTIC PROCEDURE”, AT-124.
If “STOP VEHICLE” appears on CONSULT-II screen, go to the
following step.
I
Check that “GEAR” shows “1” when depressing accelera-
tor pedal to WOT.
I
If “TESTING” does not appear on CONSULT-II for a long
time, select “SELF-DIAG RESULTS” for “ENGINE”. In case
a 1st trip DTC other than P0731 is shown, refer to appli-
cable “TROUBLE DIAGNOSIS FOR DTC”.
6)
Stop vehicle.
7)
Follow the instruction displayed. (Check for normal shifting
referring to the table below.)
Vehicle condition
Gear on actual transmission shift pattern when
screen is changed to 1
,
2
,
3
,
4
No malfunction exists
1
,
2
,
3
,
4
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0731 IMPROPER SHIFTING TO 1ST GEAR POSITION
Description (Cont’d)
AT-121
Malfunction for P0731 exists.
2
,
2
,
3
,
3
4
,
3
,
3
,
4
8)
Make sure that “OK” is displayed. (If “NG” is displayed, refer
to “DIAGNOSTIC PROCEDURE”.)
Refer to “DIAGNOSTIC PROCEDURE”, AT-124.
Refer to shift schedule, AT-356.
With GST
Follow the procedure “With CONSULT-II”.
DTC P0731 IMPROPER SHIFTING TO 1ST GEAR POSITION
Description (Cont’d)
AT-122
Wiring Diagram — AT — 1ST
NBAT0190
MAT731A
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0731 IMPROPER SHIFTING TO 1ST GEAR POSITION
Wiring Diagram — AT — 1ST
AT-123
Diagnostic Procedure
NBAT0040
1
CHECK SHIFT SOLENOID VALVE
1. Remove control valve assembly. Refer to AT-273.
2. Check shift solenoid valve operation.
I
Shift solenoid valve A
I
Shift solenoid valve B
Refer to “Component Inspection”, AT-125.
SAT648I
OK or NG
OK
©
GO TO 2.
NG
©
Repair or replace shift solenoid valve assembly.
2
CHECK CONTROL VALVE
1. Disassemble control valve assembly.
Refer to “Control Valve Assembly”, AT-301.
2. Check to ensure that:
I
Valve, sleeve and plug slide along valve bore under their own weight.
I
Valve, sleeve and plug are free from burrs, dents and scratches.
I
Control valve springs are free from damage, deformation and fatigue.
I
Hydraulic line is free from obstacles.
SAT367H
OK or NG
OK
©
GO TO 3.
NG
©
Repair control valve assembly.
3
CHECK DTC
Perform Diagnostic Trouble Code (DTC) confirmation procedure, AT-121.
OK or NG
OK
©
INSPECTION END
NG
©
Check control valve again. Repair or replace control valve assembly.
DTC P0731 IMPROPER SHIFTING TO 1ST GEAR POSITION
Diagnostic Procedure
AT-124
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