Infiniti QX4 (R50). Manual — part 32
SAT649I
Component Inspection
=NBAT0041
SHIFT SOLENOID VALVE A AND B
NBAT0041S01
I
For removal, refer to AT-273.
Resistance Check
NBAT0041S0101
I
Check resistance between terminals (3 or 2) and ground.
Solenoid valve
Terminal No.
Resistance (Approx.)
Shift solenoid valve A
3
Ground
20 - 40
Ω
Shift solenoid valve B
2
SAT648I
Operation Check
NBAT0041S0102
I
Check solenoid valve by listening for its operating sound while
applying battery voltage to the terminals (3 or 2) and ground.
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0731 IMPROPER SHIFTING TO 1ST GEAR POSITION
Component Inspection
AT-125
Description
NBAT0042
I
This is an OBD-II self-diagnostic item and not available in TCM
self-diagnosis.
I
This malfunction will not be detected while the O/D OFF indi-
cator 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
NBAT0042S02
Remarks: Specification data are reference values.
Terminal
No.
Wire color
Item
Condition
Judgement
standard
(Approx.)
12
L/R
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
NBAT0042S03
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 position supposed by TCM
1
2
3
4
In case of gear position with no malfunctions
1
2
3
4
In case of gear position with shift solenoid valve B
stuck open
4
3*
3
4
*: P0732 is detected.
Diagnostic trouble code
Malfunction is detected when ...
Check item (Possible cause)
: A/T 2ND GR FNCTN
A/T cannot be shifted to the 2nd gear
position even if electrical circuit is good.
I
Shift solenoid valve B
I
Each clutch
I
Hydraulic control circuit
: P0732
DTC P0732 IMPROPER SHIFTING TO 2ND GEAR POSITION
Description
AT-126
SAT014K
SAT971J
SAT021J
DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION
PROCEDURE
NBAT0042S01
CAUTION:
I
Always drive vehicle at a safe speed.
I
Be careful not to rev engine into the red zone on the
tachometer.
NOTE:
If “DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCE-
DURE” has been previously conducted, always turn ignition
switch “OFF” and wait at least 5 seconds before conducting
the next test.
TESTING CONDITIONS:
Always drive vehicle on a level road to improve the accuracy
of test.
After the repair, perform the following procedure to confirm the
malfunction is eliminated.
With CONSULT-II
1)
Start engine and select “DATA MONITOR” mode for “A/T” with
CONSULT-II.
2)
Make sure that output voltage of A/T fluid temperature sensor
is within the range below.
FLUID TEMP SEN: 0.4 - 1.5V
If out of range, drive the vehicle to decrease the voltage (warm
up the fluid) or stop engine to increase the voltage (cool down
the fluid).
3)
Select “2ND GR FNCTN P0732” of “DTC WORK SUPPORT”
mode for “A/T” with CONSULT-II and touch “START”.
4)
Accelerate vehicle to 25 to 30 km/h (16 to 19 MPH) under the
following condition and release the accelerator pedal com-
pletely.
THROTTLE POSI: Less than 1.0/8 (at all times during step
4)
Selector lever: D position (OD “ON”)
I
Check that “GEAR” shows “3” or “4” after releasing pedal.
5)
Depress accelerator pedal to WOT (more than 7.0/8 of
“THROTTLE POSI”) quickly from a speed of 25 to 30 km/h (16
to 19 MPH) until “TESTING” changes to “STOP VEHICLE” or
“COMPLETED”. (It will take approximately 3 seconds.)
If the check result NG appears on CONSULT-II screen, go to
“DIAGNOSTIC PROCEDURE”, AT-130.
If “STOP VEHICLE” appears on CONSULT-II screen, go to
following step.
I
Check that “GEAR” shows “2” when depressing accelera-
tor pedal to WOT.
I
If “TESTING” does not appear on CONSULT-II for a long
time, select “SELF-DIAG RESULTS” for “ENGINE”. In case
a 1st trip DTC other than P0732 is shown, refer to appli-
cable “TROUBLE DIAGNOSIS FOR DTC”.
6)
Stop vehicle.
7)
Follow the instruction displayed. (Check for normal shifting
referring to the table below.)
Vehicle condition
Gear on actual transmission shift pattern when
screen is changed to 1
,
2
,
3
,
4
No malfunction exists
1
,
2
,
3
,
4
Malfunction for P0732 exists.
4
,
3
,
3
,
4
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0732 IMPROPER SHIFTING TO 2ND GEAR POSITION
Description (Cont’d)
AT-127
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