Infiniti QX4 (R50). Manual — part 36
8)
Make sure that “OK” is displayed. (If “NG” is displayed, refer
to “DIAGNOSTIC PROCEDURE”.) Refer to “DIAGNOSTIC
PROCEDURE”, AT-143.
Refer to shift schedule, AT-356.
With GST
Follow the procedure “With CONSULT-II”.
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0734 IMPROPER SHIFTING TO 4TH GEAR POSITION
Description (Cont’d)
AT-141
Wiring Diagram — AT — 4TH
NBAT0193
MAT912A
DTC P0734 IMPROPER SHIFTING TO 4TH GEAR POSITION
Wiring Diagram — AT — 4TH
AT-142
Diagnostic Procedure
NBAT0049
1
CHECK SHIFT UP (D
3
TO D
4
)
During “Cruise test − Part 1”, AT-71.
Does A/T shift from D
3
to D
4
at the specified speed?
SAT988H
Yes or No
Yes
©
GO TO 9.
No
©
GO TO 2.
2
CHECK LINE PRESSURE
Perform line pressure test. Refer to AT-62.
OK or NG
OK
©
GO TO 3.
NG
©
GO TO 6.
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0734 IMPROPER SHIFTING TO 4TH GEAR POSITION
Diagnostic Procedure
AT-143
3
CHECK SOLENOID VALVES
1. Remove control valve assembly. Refer to AT-273.
2. Refer to “Component Inspection”, AT-147.
SAT158J
OK or NG
OK
©
GO TO 4.
NG
©
Replace solenoid valve assembly.
4
CHECK CONTROL VALVE
1. Disassemble control valve assembly. Refer to 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 5.
NG
©
Repair control valve.
DTC P0734 IMPROPER SHIFTING TO 4TH GEAR POSITION
Diagnostic Procedure (Cont’d)
AT-144
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