Infiniti I35 (A33). Manual — part 34
Wiring Diagram — AT — 1ST
NHAT0047
MAT476B
GI
MA
EM
LC
EC
FE
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0731 A/T 1ST GEAR FUNCTION
Wiring Diagram — AT — 1ST
AT-133
Diagnostic Procedure
NHAT0048
1
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 2.
NG
©
Repair or replace damaged parts.
2
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 3.
NG
©
Repair or replace shift solenoid valve assembly.
DTC P0731 A/T 1ST GEAR FUNCTION
Diagnostic Procedure
AT-134
3
CHECK CONTROL VALVE
1. Disassemble control valve assembly. Refer to “Control Valve Assembly”, AT-282.
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 assembly.
4
CHECK DTC
Perform Diagnostic Trouble Code (DTC) confirmation procedure, AT-131.
OK or NG
OK
©
INSPECTION END
NG
©
Check transaxle inner parts. (Clutch, brake, etc.)
GI
MA
EM
LC
EC
FE
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0731 A/T 1ST GEAR FUNCTION
Diagnostic Procedure (Cont’d)
AT-135
Description
NHAT0049
I
This malfunction will not be detected while the A/T CHECK
indicator lamp is indicating another self-diagnosis malfunction.
I
This malfunction is detected when the A/T does not shift into
second gear position as instructed by the TCM. This is not
caused by electrical malfunction (circuits open or shorted) but
by mechanical malfunction such as control valve sticking,
improper solenoid valve operation, etc.
Gear position
1
2
3
4
Shift solenoid valve A
ON (Closed)
OFF (Open)
OFF (Open)
ON (Closed)
Shift solenoid valve B
ON (Closed)
ON (Closed)
OFF (Open)
OFF (Open)
TCM TERMINALS AND REFERENCE VALUE
NHAT0049S01
Remarks: Specification data are reference values.
Terminal
No.
Wire color
Item
Condition
Judgement
standard
(Approx.)
12
LG/B
Shift solenoid
valve B
When shift solenoid valve B operates.
(When driving in D
1
or D
2
.)
Battery volt-
age
When shift solenoid valve B does not operate.
(When driving in D
3
or D
4
.)
0V
On Board Diagnosis Logic
NHAT0216
This diagnosis monitors actual gear position by checking the torque
converter slip ratio calculated by TCM as follows:
Torque converter slip ratio = A x C/B
A: Output shaft revolution signal from revolution sensor
B: Engine speed signal from ECM
C: Gear ratio determined as gear position which TCM supposes
If the actual gear position is higher than the position (2nd) sup-
posed by TCM, the slip ratio will be more than normal. In case the
ratio exceeds the specified value, TCM judges this diagnosis mal-
function.
This malfunction will be caused when shift solenoid valve B is stuck
open.
Gear positions supposed by TCM are as follows.
In case of gear position with no malfunctions: 1, 2, 3 and 4 posi-
tions
In case of gear position with shift solenoid valve B stuck open: 4,
3*, 3 and 4 positions to each gear position above
*: P0732 is detected.
Diagnostic trouble code A/T 2ND GR FNCTN with CONSULT-II or
P0732 without CONSULT-II is detected when A/T cannot be shifted
to the 2nd gear position even if electrical circuit is good.
DTC P0732 A/T 2ND GEAR FUNCTION
Description
AT-136
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