Infiniti I35 (A33). Manual — part 39
Diagnostic Procedure
NHAT0057
1
CHECK SHIFT UP (D
3
TO D
4
)
During “Cruise test − Part 1” (AT-77), does A/T shift from D
3
to D
4
at the specified speed?
SAT988H
Yes or No
Yes
©
GO TO 11.
No
©
GO TO 2.
2
CHECK LINE PRESSURE
Perform line pressure test.
Refer to AT-68.
MTBL1183
OK or NG
OK
©
GO TO 3.
NG
©
GO TO 7.
3
CHECK SHIFT SOLENOID VALVE RESISTANCE
1. Remove control valve assembly. Refer to AT-282.
I
Shift solenoid valve A
I
Shift solenoid valve B
2. Check resistance between two terminals.
SAT822K
OK or NG
OK
©
GO TO 4.
NG
©
Replace shift solenoid valve assembly.
GI
MA
EM
LC
EC
FE
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0734 A/T 4TH GEAR FUNCTION
Diagnostic Procedure
AT-153
4
CHECK SHIFT SOLENOID VALVE OPERATION
1. Remove control valve assembly. Refer to AT-282.
I
Shift solenoid valve A
I
Shift solenoid valve B
2. Check solenoid valve by listening for its operating sound while applying battery voltage to the terminal and ground.
SAT823K
OK or NG
OK
©
GO TO 5.
NG
©
Replace shift solenoid valve assembly.
5
CHECK CONTROL VALVE
1. Disassemble control valve assembly. Refer to AT-314.
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 6.
NG
©
Repair control valve.
6
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 11.
NG
©
Check transaxle inner parts. (Clutch, brake, etc.)
DTC P0734 A/T 4TH GEAR FUNCTION
Diagnostic Procedure (Cont’d)
AT-154
7
CHECK SOLENOID VALVE RESISTANCE
1. Remove control valve assembly. Refer to AT-282.
I
Line pressure solenoid valves
2. Check resistance to the terminal and ground.
SAT625JB
OK or NG
OK
©
GO TO 8.
NG
©
Replace solenoid valve assembly.
8
CHECK SOLENOID VALVE OPERATION
1. Remove control valve assembly. Refer to AT-282.
I
Line pressure solenoid valves
2. Check solenoid valve by listening for its operating sound while applying battery voltage to the terminal and ground.
SAT626J
OK or NG
OK
©
GO TO 9.
NG
©
Replace solenoid valve assembly.
GI
MA
EM
LC
EC
FE
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0734 A/T 4TH GEAR FUNCTION
Diagnostic Procedure (Cont’d)
AT-155
9
CHECK CONTROL VALVE
1. Disassemble control valve assembly. Refer to AT-314.
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 10.
NG
©
Repair control valve.
10
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 11.
NG
©
Check transaxle inner parts. (Clutch, brake, etc.)
11
CHECK DTC
Perform Diagnostic Trouble Code (DTC) confirmation procedure, AT-150.
OK or NG
OK
©
INSPECTION END
NG
©
Perform “Cruise test — Part 1” again and return to the start point of this test group.
DTC P0734 A/T 4TH GEAR FUNCTION
Diagnostic Procedure (Cont’d)
AT-156
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