Infiniti QX4 (R50). Manual — part 37
5
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.
6
CHECK LINE PRESSURE SOLENOID VALVE
1. Remove control valve assembly. Refer to AT-273.
2. Refer to “Component Inspection”, AT-147.
SAT158J
OK or NG
OK
©
GO TO 7.
NG
©
Replace solenoid valve assembly.
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 (Cont’d)
AT-145
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?
OK or NG
OK
©
GO TO 9.
NG
©
Check control valve again. Repair or replace control valve assembly.
9
CHECK DTC
Perform Diagnostic Trouble Code (DTC) confirmation procedure, AT-140.
OK or NG
OK
©
INSPECTION END
NG
©
Perform “Cruise test — Part 1” again and return to the start point of this flow chart.
DTC P0734 IMPROPER SHIFTING TO 4TH GEAR POSITION
Diagnostic Procedure (Cont’d)
AT-146
SAT159J
Component Inspection
NBAT0050
SOLENOID VALVES
NBAT0050S01
I
For removal, refer to AT-273.
Resistance Check
NBAT0050S0101
I
Check resistance between terminals (3, 2 or 6) and ground.
Solenoid valve
Terminal No.
Resistance (Approx.)
Shift solenoid valve A
3
Ground
20 - 40
Ω
Shift solenoid valve B
2
Line pressure solenoid valve
6
2.5 - 5
Ω
SAT158J
Operation Check
NBAT0050S0102
I
Check solenoid valve by listening for its operating sound while
applying battery voltage to the terminals (3, 2 or 6) and ground.
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
Component Inspection
AT-147
SAT342HA
Description
NBAT0051
The torque converter clutch solenoid valve is activated, with the
gear in “D
4
”, by the TCM in response to signals sent from the
vehicle speed and throttle position sensors. Lock-up piston opera-
tion will then be controlled.
Lock-up operation, however, is prohibited when A/T fluid tempera-
ture is too low.
When the accelerator pedal is depressed (less than 2/8) in lock-up
condition, the engine speed should not change abruptly. If there is
a big jump in engine speed, there is no lock-up.
CONSULT-II REFERENCE VALUE IN DATA MONITOR
MODE
NBAT0051S02
Remarks: Specification data are reference values.
Monitor item
Condition
Specification
Torque converter clutch
solenoid valve duty
Lock-up “OFF”
"
Lock-up “ON”
Approximately 4%
"
Approximately 94%
TCM TERMINALS AND REFERENCE VALUE
NBAT0051S03
Remarks: Specification data are reference values.
Terminal
No.
Wire color
Item
Condition
Judgement
standard
(Approx.)
3
G/OR
Torque converter
clutch solenoid
valve
When A/T performs lock-up.
8 - 15V
When A/T does not perform lock-up.
0V
ON BOARD DIAGNOSIS LOGIC
NBAT0051S04
Diagnostic trouble code
Malfunction is detected when ...
Check item (Possible cause)
: TCC SOLENOID/CIRC
TCM detects an improper voltage drop
when it tires to operate the solenoid
valve.
I
Harness or connectors
(The solenoid circuit is open or shorted.)
I
Torque converter clutch solenoid valve
: P0740
DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE
Description
AT-148
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