Infiniti QX4 (R50). Manual — part 40
Diagnostic Procedure
=NBAT0055
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
©
I
GO TO 10.
I
And check for proper lock-up.
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.
3
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 4.
NG
©
Repair control valve.
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0744 IMPROPER LOCK-UP OPERATION
Diagnostic Procedure
AT-157
4
CHECK SHIFT UP (D
3
TO D
4
)
Does A/T shift from D
3
to D
4
at the specified speed?
Yes or No
Yes
©
GO TO 5.
No
©
Check control valve again. Repair or replace control valve assembly.
5
CHECK DTC
Perform Diagnostic Trouble Code (DTC) confirmation procedure, AT-154.
OK or NG
OK
©
INSPECTION END
NG
©
I
GO TO 10.
I
And check for proper lock-up.
6
CHECK LINE PRESSURE SOLENOID VALVE
1. Remove control valve assembly. Refer to AT-273.
2. Check line pressure solenoid valve operation. Refer to AT-161.
SAT158J
OK or NG
OK
©
GO TO 7.
NG
©
Replace solenoid valve assembly.
DTC P0744 IMPROPER LOCK-UP OPERATION
Diagnostic Procedure (Cont’d)
AT-158
7
CHECK CONTROL VALVE
1. Disassemble control valve assembly. Refer to AT-301.
2. Check line pressure circuit valves for sticking.
I
Pressure regulator valve
I
Pilot valve
I
Pressure modifier valve
SAT367H
OK or NG
OK
©
GO TO 8.
NG
©
Repair control valve.
8
CHECK SHIFT UP (D
3
TO D
4
)
Does A/T shift from D
3
to D
4
at the specified speed?
Yes or No
Yes
©
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-154.
OK or NG
OK
©
INSPECTION END
NG
©
I
GO TO 10.
I
And check for proper lock-up.
10
CHECK LOCK-UP CONDITION
During “Cruise test − Part 1”, AT-71.
Does A/T perform lock-up at the specified speed?
Yes or No
Yes
©
Perform “Cruise test − Part 1” again and return to the start point of this flow chart.
No
©
GO TO 11.
11
CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE
1. Remove control valve assembly. Refer to AT-273.
2. Check torque converter clutch solenoid valve operation.
Refer to AT-161.
OK or NG
OK
©
GO TO 12.
NG
©
Replace solenoid valve assembly.
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0744 IMPROPER LOCK-UP OPERATION
Diagnostic Procedure (Cont’d)
AT-159
12
CHECK CONTROL VALVE
1. Disassemble control valve assembly. Refer to AT-301.
2. Check control valves for sticking.
I
Torque converter clutch control valve
I
Torque converter clutch relief valve
SAT367H
OK or NG
OK
©
GO TO 13.
NG
©
Repair control valve
13
CHECK LOCK-UP CONDITION
Does A/T perform lock-up at the specified speed?
Yes or No
Yes
©
GO TO 14.
No
©
Check control valve again. Repair or replace control valve assembly.
14
CHECK DTC
Perform Diagnostic Trouble Code (DTC) confirmation procedure, AT-154.
OK or NG
OK
©
INSPECTION END
NG
©
Perform “Cruise test — Part 1” again and return to the start point of this flow chart.
DTC P0744 IMPROPER LOCK-UP OPERATION
Diagnostic Procedure (Cont’d)
AT-160
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