Infiniti QX4 (R50). Manual — part 39
Description
NBAT0054
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
fourth gear position or the torque converter clutch does not
lock up as instructed by the TCM. This is not caused by elec-
trical malfunction (circuits open or shorted) but by mechanical
malfunction such as control valve sticking, improper solenoid
valve operation, malfunctioning oil pump or torque converter
clutch, etc.
CONSULT-II REFERENCE VALUE IN DATA MONITOR
MODE
NBAT0054S02
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%
Line pressure solenoid
valve duty
Small throttle opening (Low line pressure)
"
Large throttle opening (High line pressure)
Approximately 24%
"
Approximately 95%
TCM TERMINALS AND REFERENCE VALUE
NBAT0054S03
Remarks: Specification data are reference values.
Terminal
No.
Wire color
Item
Condition
Judgement
standard
(Approx.)
1
GY
Line pressure
solenoid valve
When releasing accelerator pedal after warm-
ing up engine.
1.5 - 3.0V
When depressing accelerator pedal fully after
warming up engine.
0V
2
BR/Y
Line pressure
solenoid valve
(with dropping
resistor)
When releasing accelerator pedal after warm-
ing up engine.
5 - 14V
When depressing accelerator pedal fully after
warming up engine.
0V
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
NBAT0054S04
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 much lower than the position (4th)
supposed by TCM, the slip ratio will be much less than normal. In
case the ratio does not reach the specified value, TCM judges this
diagnosis malfunction.
This malfunction will be caused when shift solenoid valve B is stuck
closed.
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0744 IMPROPER LOCK-UP OPERATION
Description
AT-153
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 closed
1
2
2
1*
*: P0744 is detected.
Diagnostic trouble code
Malfunction is detected when ...
Check item (Possible cause)
: A/T TCC S/V FNCTN
A/T cannot perform lock-up even if elec-
trical circuit is good.
I
Line pressure solenoid valve
I
Torque converter clutch solenoid valve
I
Each clutch
I
Hydraulic control circuit
: P0744
SAT014K
SAT971J
DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION
PROCEDURE
NBAT0054S01
CAUTION:
Always drive vehicle at a safe speed.
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.
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 “TCC S/V FNCTN P0744” of “DTC WORK SUPPORT”
mode for “A/T” with CONSULT-II and touch “START”.
SAT021J
4)
Accelerate vehicle to more than 67 to 100 km/h (42 to 62 MPH)
and maintain the following condition continuously until “TEST-
ING” has turned to “COMPLETED”. (It will take approximately
30 seconds after “TESTING” shows.)
THROTTLE POSI: 1.0/8 - 2.0/8 (at all times during step 4)
Selector lever: D position (OD “ON”)
TCC S/V DUTY: More than 94%
VHCL/S SE·A/T: Constant speed of more than 67 to 100
km/h (42 to 62 MPH)
I
Check that “GEAR” shows “4”.
I
For shift schedule, refer to SDS, AT-356.
DTC P0744 IMPROPER LOCK-UP OPERATION
Description (Cont’d)
AT-154
I
If “TESTING” does not appear on CONSULT-II for a long
time, select “SELF-DIAG RESULTS”. In case a 1st trip DTC
other than P0744 is shown, refer to applicable “TROUBLE
DIAGNOSIS FOR DTC”.
5)
Make sure that “OK” is displayed. (If “NG” is displayed, refer
to “DIAGNOSTIC PROCEDURE”.)
Refer to “DIAGNOSTIC PROCEDURE”, AT-157.
Refer to shift schedule, AT-356.
With GST
Follow the procedure “With CONSULT-II”.
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0744 IMPROPER LOCK-UP OPERATION
Description (Cont’d)
AT-155
Wiring Diagram — AT — TCCSIG
NBAT0195
MAT913A
DTC P0744 IMPROPER LOCK-UP OPERATION
Wiring Diagram — AT — TCCSIG
AT-156
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